chore: update version number to 0.1.51

App.tsx

@@ -15,7 +15,7 @@ import {
   getInitialNotificationTap,
   getStoredRelayBaseUrl,
   setupPushNotifications,
-  teardownPushNotifications,
+  teardownPushNotificationsForAccount,
   type NotificationTapPayload,
 } from './src/lib/push-notifications';
 import type { MainTabsParamList, RootStackParamList } from './src/navigation/types';
@@ -31,11 +31,14 @@ import ContactDetailScreen from './src/screens/ContactDetailScreen';
 import ContactFormScreen from './src/screens/ContactFormScreen';
 import GroupDetailScreen from './src/screens/GroupDetailScreen';
 import SettingsScreen from './src/screens/SettingsScreen';
+import ScheduledScreen from './src/screens/ScheduledScreen';
+import UnifiedInboxScreen from './src/screens/UnifiedInboxScreen';
 import { useAccountStore } from './src/stores/account-store';
 import { useAuthStore } from './src/stores/auth-store';
 import { useCalendarStore } from './src/stores/calendar-store';
 import { useContactsStore } from './src/stores/contacts-store';
 import { useEmailStore } from './src/stores/email-store';
+import { useHasCalendar, useHasContacts, useHasFiles } from './src/lib/capabilities';
 import { useSettingsStore } from './src/stores/settings-store';
 import { useLocaleStore } from './src/stores/locale-store';
 import { useNetworkStore } from './src/stores/network-store';
@@ -43,6 +46,7 @@ import { useUpdatesStore } from './src/stores/updates-store';
 import { UpdateBanner } from './src/components/UpdateBanner';
 import { OfflineCacheBanner } from './src/components/OfflineCacheBanner';
 import { useOfflineCacheStore } from './src/stores/offline-cache-store';
+import { useOutboxStore } from './src/stores/outbox-store';
 import { runOfflineSync } from './src/lib/offline-sync';
 import { spacing, typography, type ThemePalette } from './src/theme/tokens';
 import { useColors } from './src/theme/colors';
@@ -51,8 +55,21 @@ const Stack = createNativeStackNavigator<RootStackParamList>();
 const Tab = createBottomTabNavigator<MainTabsParamList>();
 const navigationRef = createNavigationContainerRef<RootStackParamList>();
 
-function navigateToNotificationTap(payload: NotificationTapPayload): void {
+async function navigateToNotificationTap(payload: NotificationTapPayload): Promise<void> {
   if (!navigationRef.isReady()) return;
+
+  // The notification carries the account it was generated for. If the user
+  // has since switched to a different account (or had a different one active
+  // when the notification arrived), opening EmailThread under the active
+  // account would fetch the email from the wrong server and fail.
+  const auth = useAuthStore.getState();
+  if (payload.accountId && payload.accountId !== auth.activeAccountId) {
+    const account = useAccountStore.getState().getAccountById(payload.accountId);
+    if (!account) return; // account was logged out — nothing safe to open.
+    await auth.switchAccount(payload.accountId);
+    if (useAuthStore.getState().activeAccountId !== payload.accountId) return;
+  }
+
   navigationRef.navigate('EmailThread', {
     emailId: payload.emailId,
     threadId: payload.threadId,
@@ -75,6 +92,10 @@ function MainTabsNavigator({ navigation }: NativeStackScreenProps<RootStackParam
   const mailboxes = useEmailStore((state) => state.mailboxes);
   const logout = useAuthStore((state) => state.logout);
   const inboxUnreadCount = mailboxes.find((mailbox) => mailbox.role === 'inbox')?.unreadEmails ?? 0;
+  const hasCalendar = useHasCalendar();
+  const hasContacts = useHasContacts();
+  const hasFiles = useHasFiles();
+  const disabledTabStyle = { opacity: 0.4 } as const;
 
   return (
     <View style={{ flex: 1, backgroundColor: c.background }}>
@@ -136,6 +157,13 @@ function MainTabsNavigator({ navigation }: NativeStackScreenProps<RootStackParam
         component={CalendarScreen}
         options={{
           tabBarIcon: ({ color, size }) => <Calendar size={size} color={color} />,
+          tabBarItemStyle: hasCalendar ? undefined : disabledTabStyle,
+          tabBarAccessibilityLabel: hasCalendar ? 'Calendar' : 'Calendar (unavailable)',
+        }}
+        listeners={{
+          tabPress: (e) => {
+            if (!hasCalendar) e.preventDefault();
+          },
         }}
       />
       <Tab.Screen
@@ -143,6 +171,13 @@ function MainTabsNavigator({ navigation }: NativeStackScreenProps<RootStackParam
         component={ContactsScreen}
         options={{
           tabBarIcon: ({ color, size }) => <BookUser size={size} color={color} />,
+          tabBarItemStyle: hasContacts ? undefined : disabledTabStyle,
+          tabBarAccessibilityLabel: hasContacts ? 'Contacts' : 'Contacts (unavailable)',
+        }}
+        listeners={{
+          tabPress: (e) => {
+            if (!hasContacts) e.preventDefault();
+          },
         }}
       />
       <Tab.Screen
@@ -150,6 +185,13 @@ function MainTabsNavigator({ navigation }: NativeStackScreenProps<RootStackParam
         component={FilesScreen}
         options={{
           tabBarIcon: ({ color, size }) => <HardDrive size={size} color={color} />,
+          tabBarItemStyle: hasFiles ? undefined : disabledTabStyle,
+          tabBarAccessibilityLabel: hasFiles ? 'Files' : 'Files (unavailable)',
+        }}
+        listeners={{
+          tabPress: (e) => {
+            if (!hasFiles) e.preventDefault();
+          },
         }}
       />
       <Tab.Screen
@@ -227,6 +269,7 @@ export default function App() {
   // feature enabled. Re-runs whenever the user changes the days window.
   const offlineCacheEnabled = useSettingsStore((s) => s.offlineCacheEnabled);
   const offlineCacheDays = useSettingsStore((s) => s.offlineCacheDays);
+  const offlineCacheMaxMB = useSettingsStore((s) => s.offlineCacheMaxMB);
   const haveLiveSession = useAuthStore((s) => s.session != null);
   React.useEffect(() => {
     void useOfflineCacheStore.getState().hydrate();
@@ -235,10 +278,21 @@ export default function App() {
     if (!offlineCacheEnabled || !haveLiveSession) return;
     // Slight delay so cold start doesn't compete with the inbox load.
     const t = setTimeout(() => {
-      void runOfflineSync({ days: offlineCacheDays });
+      void runOfflineSync({ days: offlineCacheDays, maxMB: offlineCacheMaxMB });
     }, 2000);
     return () => clearTimeout(t);
-  }, [offlineCacheEnabled, offlineCacheDays, haveLiveSession]);
+  }, [offlineCacheEnabled, offlineCacheDays, offlineCacheMaxMB, haveLiveSession]);
+
+  // Drain the offline action queue (outbox) as soon as we have a live session,
+  // and again whenever the network comes back. The flush itself no-ops when
+  // there's nothing queued or the client isn't ready.
+  React.useEffect(() => {
+    if (!haveLiveSession) return;
+    void useOutboxStore.getState().flush();
+    return useNetworkStore.subscribe((state, prev) => {
+      if (state.online && !prev.online) void useOutboxStore.getState().flush();
+    });
+  }, [haveLiveSession]);
 
   // Listen for FCM messages so the app can refresh state even when woken
   // from the background - the FirebaseMessagingService also posts the system
@@ -261,11 +315,11 @@ export default function App() {
     void (async () => {
       const initial = await getInitialNotificationTap();
       if (cancelled || !initial) return;
-      navigateToNotificationTap(initial);
+      await navigateToNotificationTap(initial);
     })();
 
     const unsubscribe = addNotificationTapListener((payload) => {
-      navigateToNotificationTap(payload);
+      void navigateToNotificationTap(payload);
     });
 
     return () => {
@@ -276,18 +330,24 @@ export default function App() {
 
   // Re-register the device with the configured relay once authenticated,
   // and whenever the FCM token rotates. Honours the user's notification
-  // preference - flipping it off tears down the active subscription so the
-  // FirebaseMessagingService stops receiving pings for this device.
+  // preference - flipping it off tears down THIS account's subscription so
+  // notifications stop arriving for it. Other logged-in accounts keep their
+  // setups intact.
   const emailNotificationsEnabled = useSettingsStore(
     (s) => s.emailNotificationsEnabled,
   );
+  const activeAccountId = useAuthStore((s) => s.activeAccountId);
   React.useEffect(() => {
     if (!isAuthenticated || !client) return;
 
     let cancelled = false;
     const doSetup = async () => {
       if (!emailNotificationsEnabled) {
-        await teardownPushNotifications().catch(() => undefined);
+        if (activeAccountId) {
+          await teardownPushNotificationsForAccount(activeAccountId).catch(
+            () => undefined,
+          );
+        }
         return;
       }
       const relayBaseUrl = await getStoredRelayBaseUrl();
@@ -315,7 +375,7 @@ export default function App() {
       cancelled = true;
       unsubscribe();
     };
-  }, [client, isAuthenticated, emailNotificationsEnabled]);
+  }, [client, isAuthenticated, emailNotificationsEnabled, activeAccountId]);
 
   React.useEffect(() => {
     if (!isAuthenticated || !client) {
@@ -404,6 +464,8 @@ export default function App() {
           }}
         />
         <Stack.Screen name="GroupDetail" component={GroupDetailScreen} />
+        <Stack.Screen name="Scheduled" component={ScheduledScreen} />
+        <Stack.Screen name="UnifiedInbox" component={UnifiedInboxScreen} />
         <Stack.Screen
           name="AddAccount"
           options={{

VERSION

@@ -1 +1 @@
-0.1.22
+0.1.51

android/app/src/main/AndroidManifest.xml

@@ -1,12 +1,11 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools">
   <uses-permission android:name="android.permission.INTERNET"/>
+  <uses-permission android:name="android.permission.CAMERA"/>
   <uses-permission android:name="android.permission.POST_NOTIFICATIONS"/>
   <uses-permission android:name="android.permission.REQUEST_INSTALL_PACKAGES"/>
-  <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
-  <uses-permission android:name="android.permission.RECORD_AUDIO"/>
-  <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"/>
+  <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" android:maxSdkVersion="32"/>
+  <uses-permission android:name="android.permission.READ_MEDIA_IMAGES"/>
   <uses-permission android:name="android.permission.VIBRATE"/>
-  <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
   <queries>
     <intent>
       <action android:name="android.intent.action.VIEW"/>
@@ -23,6 +22,12 @@
         <action android:name="android.intent.action.MAIN"/>
         <category android:name="android.intent.category.LAUNCHER"/>
       </intent-filter>
+      <intent-filter>
+        <action android:name="android.intent.action.VIEW"/>
+        <category android:name="android.intent.category.DEFAULT"/>
+        <category android:name="android.intent.category.BROWSABLE"/>
+        <data android:scheme="bulwarkmobile"/>
+      </intent-filter>
     </activity>
     <service android:name=".BulwarkMessagingService" android:exported="false">
       <intent-filter>

android/app/src/main/java/com/anonymous/bulwarkmobile/BulwarkFcmModule.kt

@@ -19,6 +19,7 @@ import com.facebook.react.bridge.ReadableMap
 import com.facebook.react.bridge.WritableMap
 import com.facebook.react.modules.core.DeviceEventManagerModule.RCTDeviceEventEmitter
 import com.google.firebase.messaging.FirebaseMessaging
+import java.io.ByteArrayOutputStream
 import java.net.HttpURLConnection
 import java.net.URL
 import kotlin.concurrent.thread
@@ -64,6 +65,7 @@ class BulwarkFcmModule(reactContext: ReactApplicationContext)
         val emailId = options.getString("emailId")
         val threadId = options.getString("threadId")
         val subject = options.takeIf { it.hasKey("subject") }?.getString("subject")
+        val accountId = options.takeIf { it.hasKey("accountId") }?.getString("accountId")
 
         // Bitmap fetch + draw off the bridge thread so the caller doesn't
         // block waiting for the favicon request.
@@ -72,7 +74,7 @@ class BulwarkFcmModule(reactContext: ReactApplicationContext)
                 ?: makeLetterAvatar(initials, bgColorHex)
             postNotification(
                 notificationId, title, body, largeIcon, bgColorHex,
-                emailId, threadId, subject,
+                emailId, threadId, subject, accountId,
             )
             promise.resolve(null)
         }
@@ -93,6 +95,7 @@ class BulwarkFcmModule(reactContext: ReactApplicationContext)
         emailId: String?,
         threadId: String?,
         subject: String?,
+        accountId: String?,
     ) {
         val ctx = reactApplicationContext
         val intent = Intent(ctx, MainActivity::class.java).apply {
@@ -100,6 +103,7 @@ class BulwarkFcmModule(reactContext: ReactApplicationContext)
             if (emailId != null) putExtra(NotificationTapStore.EXTRA_EMAIL_ID, emailId)
             if (threadId != null) putExtra(NotificationTapStore.EXTRA_THREAD_ID, threadId)
             if (subject != null) putExtra(NotificationTapStore.EXTRA_SUBJECT, subject)
+            if (accountId != null) putExtra(NotificationTapStore.EXTRA_ACCOUNT_ID, accountId)
         }
         val pending = PendingIntent.getActivity(
             ctx,
@@ -148,7 +152,36 @@ class BulwarkFcmModule(reactContext: ReactApplicationContext)
         conn.readTimeout = 3000
         conn.instanceFollowRedirects = true
         conn.setRequestProperty("User-Agent", "bulwark-mobile")
-        conn.inputStream.use { BitmapFactory.decodeStream(it) }
+        // Cap the response to MAX_FAVICON_BYTES so a hostile / misconfigured
+        // server can't OOM the headless task with a multi-megabyte image.
+        // We also sample down to ~256x256 since it'll only render at 192px.
+        val stream = conn.inputStream
+        val bytes = stream.use { input ->
+            val limit = MAX_FAVICON_BYTES
+            val buf = ByteArrayOutputStream()
+            val chunk = ByteArray(8 * 1024)
+            var total = 0
+            while (true) {
+                val n = input.read(chunk)
+                if (n <= 0) break
+                total += n
+                if (total > limit) return@use null
+                buf.write(chunk, 0, n)
+            }
+            buf.toByteArray()
+        } ?: return null
+        val opts = BitmapFactory.Options().apply {
+            inJustDecodeBounds = true
+        }
+        BitmapFactory.decodeByteArray(bytes, 0, bytes.size, opts)
+        var sample = 1
+        while ((opts.outWidth / sample) > 384 || (opts.outHeight / sample) > 384) {
+            sample *= 2
+        }
+        val decodeOpts = BitmapFactory.Options().apply {
+            inSampleSize = sample
+        }
+        BitmapFactory.decodeByteArray(bytes, 0, bytes.size, decodeOpts)
     } catch (_: Exception) {
         null
     }
@@ -167,6 +200,9 @@ class BulwarkFcmModule(reactContext: ReactApplicationContext)
     fun removeListeners(count: Int) {}
 
     companion object {
+        // 1 MiB is plenty for a favicon; anything bigger is a sign of trouble.
+        private const val MAX_FAVICON_BYTES = 1 * 1024 * 1024
+
         @Volatile private var currentInstance: BulwarkFcmModule? = null
 
         fun emit(eventName: String, params: WritableMap?) {

android/app/src/main/java/com/anonymous/bulwarkmobile/NotificationTapStore.kt

@@ -17,17 +17,36 @@ object NotificationTapStore {
         return value
     }
 
+    // The activity is exported (required by the LAUNCHER intent filter), so
+    // any third-party app on the device can craft a starting intent that
+    // includes these extras. Reject anything that doesn't look like the IDs
+    // our notification builder writes — preventing other apps from
+    // navigating us to a forged email/thread.
+    private val ID_PATTERN = Regex("^[A-Za-z0-9_-]{1,128}$")
+    // accountId is `username@host` (see generateAccountId), so it needs `.`,
+    // `@`, `+` etc. — cap length and restrict charset to what that helper can
+    // emit. accountId is optional: notifications created before this field
+    // existed still navigate (using the active account as a fallback).
+    private val ACCOUNT_ID_PATTERN = Regex("^[A-Za-z0-9._+@-]{1,256}$")
+
     fun captureFromIntent(intent: Intent?): TapPayload? {
         val extras = intent?.extras ?: return null
-        val emailId = extras.getString(EXTRA_EMAIL_ID) ?: return null
-        val threadId = extras.getString(EXTRA_THREAD_ID) ?: return null
-        val subject = extras.getString(EXTRA_SUBJECT)
-        val payload = TapPayload(emailId, threadId, subject)
+        val emailId = extras.getString(EXTRA_EMAIL_ID)?.takeIf { ID_PATTERN.matches(it) }
+            ?: return null
+        val threadId = extras.getString(EXTRA_THREAD_ID)?.takeIf { ID_PATTERN.matches(it) }
+            ?: return null
+        // Subject is human-readable text and may legitimately contain anything;
+        // cap its length so a hostile launcher can't ship a 1MB string into
+        // the navigation payload.
+        val subject = extras.getString(EXTRA_SUBJECT)?.take(512)
+        val accountId = extras.getString(EXTRA_ACCOUNT_ID)?.takeIf { ACCOUNT_ID_PATTERN.matches(it) }
+        val payload = TapPayload(emailId, threadId, subject, accountId)
         pending = payload
         // Clear so a subsequent activity lifecycle event doesn't replay this.
         extras.remove(EXTRA_EMAIL_ID)
         extras.remove(EXTRA_THREAD_ID)
         extras.remove(EXTRA_SUBJECT)
+        extras.remove(EXTRA_ACCOUNT_ID)
         return payload
     }
 
@@ -35,15 +54,18 @@ object NotificationTapStore {
         val emailId: String,
         val threadId: String,
         val subject: String?,
+        val accountId: String?,
     ) {
         fun toMap(): WritableMap = Arguments.createMap().apply {
             putString("emailId", emailId)
             putString("threadId", threadId)
             if (subject != null) putString("subject", subject)
+            if (accountId != null) putString("accountId", accountId)
         }
     }
 
     const val EXTRA_EMAIL_ID = "bulwark.notification.emailId"
     const val EXTRA_THREAD_ID = "bulwark.notification.threadId"
     const val EXTRA_SUBJECT = "bulwark.notification.subject"
+    const val EXTRA_ACCOUNT_ID = "bulwark.notification.accountId"
 }

app.config.js

@@ -20,6 +20,7 @@ module.exports = {
   expo: {
     name: 'Bulwark Mobile',
     slug: 'bulwark-mobile',
+    scheme: 'bulwarkmobile',
     version: VERSION,
     orientation: 'portrait',
     icon: './assets/icon.png',
@@ -45,7 +46,18 @@ module.exports = {
     web: {
       favicon: './assets/favicon.png',
     },
-    plugins: ['expo-secure-store', '@react-native-community/datetimepicker', 'expo-localization'],
+    plugins: [
+      'expo-secure-store',
+      '@react-native-community/datetimepicker',
+      'expo-localization',
+      [
+        'expo-camera',
+        {
+          cameraPermission:
+            'Bulwark Mail uses the camera to scan sign-in QR codes shown in webmail.',
+        },
+      ],
+    ],
     extra: {
       commit: COMMIT,
     },

locales/en/common.json

@@ -821,10 +821,13 @@
       },
       "date_format": {
         "label": "Date Format",
-        "description": "How dates should be displayed",
-        "regional": "Regional",
-        "iso": "ISO 8601",
-        "custom": "Custom"
+        "description": "How dates are shown in the email list",
+        "smart": "Smart (locale-aware)",
+        "relative": "Relative (1h ago, 2d ago)",
+        "full": "Always full date",
+        "preview_today": "Today:",
+        "preview_this_week": "This week:",
+        "preview_older": "Older:"
       },
       "time_format": {
         "label": "Time Format",
@@ -1424,6 +1427,7 @@
       "size_bytes": "Size in bytes",
       "size_placeholder": "e.g., 1000000",
       "system_managed": "System-managed rule",
+      "origin_external": "External",
       "opaque_warning": "This script was edited outside the visual builder. Only raw Sieve editing is available.",
       "open_sieve_editor": "Open raw Sieve editor",
       "fetch_error": "Failed to load filters",

package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "bulwark-mobile",
-  "version": "0.1.22",
+  "version": "0.1.51",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "bulwark-mobile",
-      "version": "0.1.22",
+      "version": "0.1.51",
       "license": "AGPL-3.0-only",
       "dependencies": {
         "@react-native-async-storage/async-storage": "2.2.0",
@@ -17,6 +17,8 @@
         "@react-navigation/native-stack": "^7.14.10",
         "date-fns": "^4.1.0",
         "expo": "~54.0.33",
+        "expo-camera": "~17.0.10",
+        "expo-document-picker": "~14.0.8",
         "expo-file-system": "~19.0.21",
         "expo-image-picker": "~17.0.10",
         "expo-intent-launcher": "~13.0.8",
@@ -24,6 +26,8 @@
         "expo-secure-store": "~15.0.8",
         "expo-sharing": "~14.0.8",
         "expo-status-bar": "~3.0.9",
+        "expo-web-browser": "~15.0.8",
+        "jszip": "^3.10.1",
         "lucide-react-native": "^1.7.0",
         "react": "19.1.0",
         "react-native": "0.81.5",
@@ -4755,6 +4759,12 @@
         "url": "https://opencollective.com/core-js"
       }
     },
+    "node_modules/core-util-is": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/core-util-is/-/core-util-is-1.0.3.tgz",
+      "integrity": "sha512-ZQBvi1DcpJ4GDqanjucZ2Hj3wEO5pZDS89BWbkcrvdxksJorwUDDZamX9ldFkp9aw2lmBDLgkObEA4DWNJ9FYQ==",
+      "license": "MIT"
+    },
     "node_modules/cross-spawn": {
       "version": "7.0.6",
       "resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-7.0.6.tgz",
@@ -5202,6 +5212,26 @@
         }
       }
     },
+    "node_modules/expo-camera": {
+      "version": "17.0.10",
+      "resolved": "https://registry.npmjs.org/expo-camera/-/expo-camera-17.0.10.tgz",
+      "integrity": "sha512-w1RBw83mAGVk4BPPwNrCZyFop0VLiVSRE3c2V9onWbdFwonpRhzmB4drygG8YOUTl1H3wQvALJHyMPTbgsK1Jg==",
+      "license": "MIT",
+      "dependencies": {
+        "invariant": "^2.2.4"
+      },
+      "peerDependencies": {
+        "expo": "*",
+        "react": "*",
+        "react-native": "*",
+        "react-native-web": "*"
+      },
+      "peerDependenciesMeta": {
+        "react-native-web": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/expo-constants": {
       "version": "18.0.13",
       "resolved": "https://registry.npmjs.org/expo-constants/-/expo-constants-18.0.13.tgz",
@@ -5216,6 +5246,15 @@
         "react-native": "*"
       }
     },
+    "node_modules/expo-document-picker": {
+      "version": "14.0.8",
+      "resolved": "https://registry.npmjs.org/expo-document-picker/-/expo-document-picker-14.0.8.tgz",
+      "integrity": "sha512-3tyQKpPqWWFlI8p9RiMX1+T1Zge5mEKeBuXWp1h8PEItFMUDSiOJbQ112sfdC6Hxt8wSxreV9bCRl/NgBdt+fA==",
+      "license": "MIT",
+      "peerDependencies": {
+        "expo": "*"
+      }
+    },
     "node_modules/expo-file-system": {
       "version": "19.0.21",
       "resolved": "https://registry.npmjs.org/expo-file-system/-/expo-file-system-19.0.21.tgz",
@@ -5408,6 +5447,16 @@
         "react-native": "*"
       }
     },
+    "node_modules/expo-web-browser": {
+      "version": "15.0.11",
+      "resolved": "https://registry.npmjs.org/expo-web-browser/-/expo-web-browser-15.0.11.tgz",
+      "integrity": "sha512-r2LS4Ro6DgUPZkcaEfgt8mp9eJuoA93x11Jh7S6utFe0FEzvUNn2yFhxg8XVwESaaHGt2k5V8LuK36rsp0BeIw==",
+      "license": "MIT",
+      "peerDependencies": {
+        "expo": "*",
+        "react-native": "*"
+      }
+    },
     "node_modules/expo/node_modules/@babel/code-frame": {
       "version": "7.29.0",
       "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.29.0.tgz",
@@ -6181,6 +6230,12 @@
         "node": ">=16.x"
       }
     },
+    "node_modules/immediate": {
+      "version": "3.0.6",
+      "resolved": "https://registry.npmjs.org/immediate/-/immediate-3.0.6.tgz",
+      "integrity": "sha512-XXOFtyqDjNDAQxVfYxuF7g9Il/IbWmmlQg2MYKOH8ExIT1qg6xc4zyS3HaEEATgs1btfzxq15ciUiY7gjSXRGQ==",
+      "license": "MIT"
+    },
     "node_modules/imurmurhash": {
       "version": "0.1.4",
       "resolved": "https://registry.npmjs.org/imurmurhash/-/imurmurhash-0.1.4.tgz",
@@ -6297,6 +6352,12 @@
         "node": ">=8"
       }
     },
+    "node_modules/isarray": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/isarray/-/isarray-1.0.0.tgz",
+      "integrity": "sha512-VLghIWNM6ELQzo7zwmcg0NmTVyWKYjvIeM83yjp0wRDTmUnrM678fQbcKBo6n2CJEF0szoG//ytg+TKla89ALQ==",
+      "license": "MIT"
+    },
     "node_modules/isexe": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/isexe/-/isexe-2.0.0.tgz",
@@ -6798,6 +6859,18 @@
         "node": ">=6"
       }
     },
+    "node_modules/jszip": {
+      "version": "3.10.1",
+      "resolved": "https://registry.npmjs.org/jszip/-/jszip-3.10.1.tgz",
+      "integrity": "sha512-xXDvecyTpGLrqFrvkrUSoxxfJI5AH7U8zxxtVclpsUtMCq4JQ290LY8AW5c7Ggnr/Y/oK+bQMbqK2qmtk3pN4g==",
+      "license": "(MIT OR GPL-3.0-or-later)",
+      "dependencies": {
+        "lie": "~3.3.0",
+        "pako": "~1.0.2",
+        "readable-stream": "~2.3.6",
+        "setimmediate": "^1.0.5"
+      }
+    },
     "node_modules/kleur": {
       "version": "3.0.3",
       "resolved": "https://registry.npmjs.org/kleur/-/kleur-3.0.3.tgz",
@@ -6825,6 +6898,15 @@
         "node": ">=6"
       }
     },
+    "node_modules/lie": {
+      "version": "3.3.0",
+      "resolved": "https://registry.npmjs.org/lie/-/lie-3.3.0.tgz",
+      "integrity": "sha512-UaiMJzeWRlEujzAuw5LokY1L5ecNQYZKfmyZ9L7wDHb/p5etKaxXhohBcrw0EYby+G/NA52vRSN4N39dxHAIwQ==",
+      "license": "MIT",
+      "dependencies": {
+        "immediate": "~3.0.5"
+      }
+    },
     "node_modules/lighthouse-logger": {
       "version": "1.4.2",
       "resolved": "https://registry.npmjs.org/lighthouse-logger/-/lighthouse-logger-1.4.2.tgz",
@@ -7985,6 +8067,12 @@
         "node": ">=6"
       }
     },
+    "node_modules/pako": {
+      "version": "1.0.11",
+      "resolved": "https://registry.npmjs.org/pako/-/pako-1.0.11.tgz",
+      "integrity": "sha512-4hLB8Py4zZce5s4yd9XzopqwVv/yGNhV1Bl8NTmCq1763HeK2+EwVTv+leGeL13Dnh2wfbqowVPXCIO0z4taYw==",
+      "license": "(MIT AND Zlib)"
+    },
     "node_modules/parse-png": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/parse-png/-/parse-png-2.1.0.tgz",
@@ -8196,6 +8284,12 @@
         "node": "^14.17.0 || ^16.13.0 || >=18.0.0"
       }
     },
+    "node_modules/process-nextick-args": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/process-nextick-args/-/process-nextick-args-2.0.1.tgz",
+      "integrity": "sha512-3ouUOpQhtgrbOa17J7+uxOTpITYWaGP7/AhoR3+A+/1e9skrzelGi/dXzEYyvbxubEF6Wn2ypscTKiKJFFn1ag==",
+      "license": "MIT"
+    },
     "node_modules/progress": {
       "version": "2.0.3",
       "resolved": "https://registry.npmjs.org/progress/-/progress-2.0.3.tgz",
@@ -8564,6 +8658,27 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/readable-stream": {
+      "version": "2.3.8",
+      "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-2.3.8.tgz",
+      "integrity": "sha512-8p0AUk4XODgIewSi0l8Epjs+EVnWiK7NoDIEGU0HhE7+ZyY8D1IMY7odu5lRrFXGg71L15KG8QrPmum45RTtdA==",
+      "license": "MIT",
+      "dependencies": {
+        "core-util-is": "~1.0.0",
+        "inherits": "~2.0.3",
+        "isarray": "~1.0.0",
+        "process-nextick-args": "~2.0.0",
+        "safe-buffer": "~5.1.1",
+        "string_decoder": "~1.1.1",
+        "util-deprecate": "~1.0.1"
+      }
+    },
+    "node_modules/readable-stream/node_modules/safe-buffer": {
+      "version": "5.1.2",
+      "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.1.2.tgz",
+      "integrity": "sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g==",
+      "license": "MIT"
+    },
     "node_modules/regenerate": {
       "version": "1.4.2",
       "resolved": "https://registry.npmjs.org/regenerate/-/regenerate-1.4.2.tgz",
@@ -8968,6 +9083,12 @@
         "node": ">= 0.8"
       }
     },
+    "node_modules/setimmediate": {
+      "version": "1.0.5",
+      "resolved": "https://registry.npmjs.org/setimmediate/-/setimmediate-1.0.5.tgz",
+      "integrity": "sha512-MATJdZp8sLqDl/68LfQmbP8zKPLQNV6BIZoIgrscFDQ+RsvK/BxeDQOgyxKKoh0y/8h3BqVFnCqQ/gd+reiIXA==",
+      "license": "MIT"
+    },
     "node_modules/setprototypeof": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/setprototypeof/-/setprototypeof-1.2.0.tgz",
@@ -9205,6 +9326,21 @@
         "node": ">=4"
       }
     },
+    "node_modules/string_decoder": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.1.1.tgz",
+      "integrity": "sha512-n/ShnvDi6FHbbVfviro+WojiFzv+s8MPMHBczVePfUpDJLwoLT0ht1l4YwBCbi8pJAveEEdnkHyPyTP/mzRfwg==",
+      "license": "MIT",
+      "dependencies": {
+        "safe-buffer": "~5.1.0"
+      }
+    },
+    "node_modules/string_decoder/node_modules/safe-buffer": {
+      "version": "5.1.2",
+      "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.1.2.tgz",
+      "integrity": "sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g==",
+      "license": "MIT"
+    },
     "node_modules/string-width": {
       "version": "4.2.3",
       "resolved": "https://registry.npmjs.org/string-width/-/string-width-4.2.3.tgz",
@@ -9741,6 +9877,12 @@
         "react": "^16.8.0 || ^17.0.0 || ^18.0.0 || ^19.0.0"
       }
     },
+    "node_modules/util-deprecate": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
+      "integrity": "sha512-EPD5q1uXyFxJpCrLnCc1nHnq3gOa6DZBocAIiI2TaSCA7VCJ1UJDMagCzIkXNsUYfD1daK//LTEQ8xiIbrHtcw==",
+      "license": "MIT"
+    },
     "node_modules/utils-merge": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/utils-merge/-/utils-merge-1.0.1.tgz",

package.json

@@ -1,6 +1,6 @@
 {
   "name": "bulwark-mobile",
-  "version": "0.1.22",
+  "version": "0.1.51",
   "license": "AGPL-3.0-only",
   "main": "index.ts",
   "scripts": {
@@ -10,6 +10,7 @@
     "web": "expo start --web",
     "test": "vitest run",
     "test:watch": "vitest",
+    "typecheck": "tsc --noEmit",
     "bump": "node scripts/bump-version.mjs",
     "sync-locales": "node scripts/sync-locales.mjs"
   },
@@ -22,6 +23,8 @@
     "@react-navigation/native-stack": "^7.14.10",
     "date-fns": "^4.1.0",
     "expo": "~54.0.33",
+    "expo-camera": "~17.0.10",
+    "expo-document-picker": "~14.0.8",
     "expo-file-system": "~19.0.21",
     "expo-image-picker": "~17.0.10",
     "expo-intent-launcher": "~13.0.8",
@@ -29,6 +32,8 @@
     "expo-secure-store": "~15.0.8",
     "expo-sharing": "~14.0.8",
     "expo-status-bar": "~3.0.9",
+    "expo-web-browser": "~15.0.8",
+    "jszip": "^3.10.1",
     "lucide-react-native": "^1.7.0",
     "react": "19.1.0",
     "react-native": "0.81.5",

src/api/__tests__/calendar.test.ts

@@ -4,6 +4,7 @@ vi.mock('../jmap-client', () => ({
   jmapClient: {
     accountId: 'acc-1',
     request: vi.fn(),
+    getMaxObjectsInGet: () => 500,
   },
 }));
 
@@ -41,7 +42,10 @@ describe('calendar operations', () => {
   });
 
   describe('queryEvents', () => {
-    it('should query events within date range', async () => {
+    it('should filter via singular inCalendar conditions (Stalwart-compatible)', async () => {
+      // Stalwart rejects the draft's plural `inCalendars` filter (and
+      // after/before); calendars are restricted via singular `inCalendar`
+      // conditions and date filtering stays client-side.
       mockRequest.mockResolvedValue({
         methodResponses: [['CalendarEvent/query', { ids: ['ev1', 'ev2'] }, '0']],
       });
@@ -50,12 +54,35 @@ describe('calendar operations', () => {
       expect(result).toEqual(['ev1', 'ev2']);
 
       const call = mockRequest.mock.calls[0][0][0];
-      expect(call[1].filter).toEqual({
-        inCalendars: ['cal-1'],
-        after: '2026-03-01T00:00:00Z',
-        before: '2026-03-31T23:59:59Z',
-        types: ['Event'],
+      expect(call[0]).toBe('CalendarEvent/query');
+      expect(call[1].filter).toEqual({ inCalendar: 'cal-1' });
+      expect(call[1].accountId).toBe('acc-1');
+    });
+
+    it('should OR multiple calendars and respect the target account', async () => {
+      mockRequest.mockResolvedValue({
+        methodResponses: [['CalendarEvent/query', { ids: [] }, '0']],
       });
+
+      await queryEvents(['cal-1', 'cal-2'], '', '', 'acc-shared');
+
+      const call = mockRequest.mock.calls[0][0][0];
+      expect(call[1].filter).toEqual({
+        operator: 'OR',
+        conditions: [{ inCalendar: 'cal-1' }, { inCalendar: 'cal-2' }],
+      });
+      expect(call[1].accountId).toBe('acc-shared');
+    });
+
+    it('should omit the filter when no calendars are given', async () => {
+      mockRequest.mockResolvedValue({
+        methodResponses: [['CalendarEvent/query', { ids: [] }, '0']],
+      });
+
+      await queryEvents([], '', '');
+
+      const call = mockRequest.mock.calls[0][0][0];
+      expect(call[1].filter).toBeUndefined();
     });
   });
 

src/api/__tests__/contacts.test.ts

@@ -4,6 +4,7 @@ vi.mock('../jmap-client', () => ({
   jmapClient: {
     accountId: 'acc-1',
     request: vi.fn(),
+    getMaxObjectsInGet: () => 500,
   },
 }));
 
@@ -15,6 +16,9 @@ import {
   createContact,
   updateContact,
   deleteContacts,
+  createAddressBook,
+  updateAddressBook,
+  deleteAddressBook,
 } from '../contacts';
 
 const mockRequest = jmapClient.request as ReturnType<typeof vi.fn>;
@@ -50,14 +54,14 @@ describe('contacts operations', () => {
       expect(result).toEqual(['c1', 'c2']);
     });
 
-    it('should use default empty filter', async () => {
+    it('should omit filter when none provided', async () => {
       mockRequest.mockResolvedValue({
         methodResponses: [['ContactCard/query', { ids: [] }, '0']],
       });
 
       await queryContacts();
       const call = mockRequest.mock.calls[0][0][0];
-      expect(call[1].filter).toEqual({});
+      expect(call[1].filter).toBeUndefined();
     });
   });
 
@@ -116,4 +120,58 @@ describe('contacts operations', () => {
       expect(call[1].destroy).toEqual(['c1', 'c2']);
     });
   });
+
+  describe('createAddressBook', () => {
+    it('creates a book and returns the created entity', async () => {
+      mockRequest.mockResolvedValue({
+        methodResponses: [['AddressBook/set', { created: { 'new-book': { id: 'ab-9' } } }, '0']],
+      });
+
+      const book = await createAddressBook('Work');
+
+      const call = mockRequest.mock.calls[0][0][0];
+      expect(call[1].create).toEqual({ 'new-book': { name: 'Work' } });
+      expect(book).toEqual({ id: 'ab-9', name: 'Work' });
+    });
+
+    it('throws when the server refuses to create', async () => {
+      mockRequest.mockResolvedValue({
+        methodResponses: [['AddressBook/set', { notCreated: { 'new-book': { description: 'nope' } } }, '0']],
+      });
+      await expect(createAddressBook('X')).rejects.toThrow('nope');
+    });
+  });
+
+  describe('updateAddressBook', () => {
+    it('forwards only settable properties', async () => {
+      mockRequest.mockResolvedValue({
+        methodResponses: [['AddressBook/set', { updated: { 'ab-1': null } }, '0']],
+      });
+
+      await updateAddressBook('ab-1', { name: 'Renamed', id: 'should-be-ignored' } as never);
+
+      const call = mockRequest.mock.calls[0][0][0];
+      expect(call[1].update).toEqual({ 'ab-1': { name: 'Renamed' } });
+    });
+  });
+
+  describe('deleteAddressBook', () => {
+    it('destroys the book by id', async () => {
+      mockRequest.mockResolvedValue({
+        methodResponses: [['AddressBook/set', { destroyed: ['ab-1'] }, '0']],
+      });
+
+      await deleteAddressBook('ab-1');
+
+      const call = mockRequest.mock.calls[0][0][0];
+      expect(call[1].destroy).toEqual(['ab-1']);
+    });
+
+    it('throws when destroy fails', async () => {
+      mockRequest.mockResolvedValue({
+        methodResponses: [['AddressBook/set', { notDestroyed: { 'ab-1': { description: 'in use' } } }, '0']],
+      });
+      await expect(deleteAddressBook('ab-1')).rejects.toThrow('in use');
+    });
+  });
 });

src/api/__tests__/email.test.ts

@@ -90,6 +90,24 @@ describe('email operations', () => {
       const call = mockRequest.mock.calls[0][0][0];
       expect(call[1].filter).toEqual({ inMailbox: 'mb-1', hasKeyword: '$flagged' });
     });
+
+    it('should AND-wrap a FilterOperator instead of spreading it', async () => {
+      mockRequest.mockResolvedValue({
+        methodResponses: [['Email/query', { ids: [], total: 0 }, '0']],
+      });
+
+      const userFilter = {
+        operator: 'AND',
+        conditions: [{ inMailbox: 'mb-1' }, { notKeyword: '$seen' }],
+      };
+      await queryEmails('mb-1', { filter: userFilter });
+
+      const call = mockRequest.mock.calls[0][0][0];
+      expect(call[1].filter).toEqual({
+        operator: 'AND',
+        conditions: [{ inMailbox: 'mb-1' }, userFilter],
+      });
+    });
   });
 
   describe('getEmails', () => {
@@ -197,7 +215,7 @@ describe('email operations', () => {
 
       expect(result).toEqual(['e1']);
       const call = mockRequest.mock.calls[0][0][0];
-      expect(call[1].filter).toEqual({ text: 'test query' });
+      expect(call[1].filter).toEqual({ text: 'test* query*' });
     });
 
     it('should include mailbox filter if specified', async () => {
@@ -208,7 +226,7 @@ describe('email operations', () => {
       await searchEmails('query', 'mb-1');
 
       const call = mockRequest.mock.calls[0][0][0];
-      expect(call[1].filter).toEqual({ text: 'query', inMailbox: 'mb-1' });
+      expect(call[1].filter).toEqual({ text: 'query*', inMailbox: 'mb-1' });
     });
   });
 

src/api/__tests__/files.test.ts

@@ -0,0 +1,252 @@
+import { describe, it, expect, vi, beforeEach } from 'vitest';
+
+vi.mock('../jmap-client', () => ({
+  jmapClient: {
+    accountId: 'acc-1',
+    request: vi.fn(),
+    hasCapability: vi.fn(),
+    currentSession: null as unknown,
+  },
+}));
+
+vi.mock('../blob', () => ({
+  getDownloadUrl: vi.fn(
+    (blobId: string, _name?: string, _type?: string, accountId?: string) =>
+      `https://dl/${accountId ?? 'own'}/${blobId}`,
+  ),
+  uploadBlob: vi.fn(),
+  uploadBytes: vi.fn(),
+}));
+
+import { jmapClient } from '../jmap-client';
+import { CAPABILITIES } from '../types';
+import {
+  createFolder,
+  deleteFileNodes,
+  getAllFileNodesAcrossAccounts,
+  getFileNodeDownloadUrl,
+  getPrincipals,
+  isCrossAccountId,
+  isFolder,
+  setFileNodeShare,
+} from '../files';
+
+const mockRequest = jmapClient.request as ReturnType<typeof vi.fn>;
+const mockHasCapability = jmapClient.hasCapability as ReturnType<typeof vi.fn>;
+
+function setSession(session: unknown) {
+  (jmapClient as { currentSession: unknown }).currentSession = session;
+}
+
+beforeEach(() => {
+  vi.clearAllMocks();
+  mockHasCapability.mockImplementation(
+    (urn: string) => urn === CAPABILITIES.FILES || urn === CAPABILITIES.PRINCIPALS,
+  );
+  setSession({
+    primaryAccounts: { [CAPABILITIES.FILES]: 'acc-1' },
+    accounts: {
+      'acc-1': { name: 'me@example.com', isPersonal: true },
+    },
+  });
+});
+
+describe('isFolder', () => {
+  it('treats blob-less nodes as folders and anything with a blob as a file', () => {
+    // #379: a blob-marked node — even the legacy type:'d' dir markers — is a
+    // 0-byte file that nothing can be parented under.
+    expect(isFolder({ blobId: null })).toBe(true);
+    expect(isFolder({ blobId: undefined })).toBe(true);
+    expect(isFolder({ blobId: 'blob-1' })).toBe(false);
+  });
+});
+
+describe('createFolder', () => {
+  it('creates a real container node: no blobId/type/size, parentId set', async () => {
+    mockRequest.mockResolvedValue({
+      methodResponses: [['FileNode/set', { created: { 'new-dir': { id: 'f1' } } }, '0']],
+    });
+
+    await createFolder('Docs', 'parent-1');
+
+    const [method, args] = mockRequest.mock.calls[0][0][0];
+    expect(method).toBe('FileNode/set');
+    expect(args.create['new-dir']).toEqual({ name: 'Docs', parentId: 'parent-1' });
+  });
+
+  it('omits parentId at the root', async () => {
+    mockRequest.mockResolvedValue({
+      methodResponses: [['FileNode/set', { created: { 'new-dir': { id: 'f1' } } }, '0']],
+    });
+
+    await createFolder('Docs', null);
+
+    const args = mockRequest.mock.calls[0][0][0][1];
+    expect(args.create['new-dir']).toEqual({ name: 'Docs' });
+  });
+});
+
+describe('deleteFileNodes', () => {
+  it('lets the server cascade into folder children', async () => {
+    mockRequest.mockResolvedValue({
+      methodResponses: [['FileNode/set', { destroyed: ['f1'] }, '0']],
+    });
+
+    await deleteFileNodes(['f1']);
+
+    const args = mockRequest.mock.calls[0][0][0][1];
+    expect(args.destroy).toEqual(['f1']);
+    expect(args.onDestroyRemoveChildren).toBe(true);
+  });
+
+  it('throws when the server refuses a destroy', async () => {
+    mockRequest.mockResolvedValue({
+      methodResponses: [
+        ['FileNode/set', { notDestroyed: { f1: { description: 'forbidden' } } }, '0'],
+      ],
+    });
+
+    await expect(deleteFileNodes(['f1'])).rejects.toThrow('forbidden');
+  });
+});
+
+describe('setFileNodeShare', () => {
+  it('patches shareWith/{principalId} and requests the principals:owner capability', async () => {
+    mockRequest.mockResolvedValue({
+      methodResponses: [['FileNode/set', { updated: { 'node-1': null } }, '0']],
+    });
+    const rights = {
+      mayRead: true, mayAddChildren: false, mayRename: false,
+      mayDelete: false, mayModifyContent: false, mayShare: false,
+    };
+
+    await setFileNodeShare('node-1', 'principal-2', rights);
+
+    const [calls, using] = mockRequest.mock.calls[0];
+    expect(calls[0][1].update['node-1']).toEqual({ 'shareWith/principal-2': rights });
+    expect(using).toContain(CAPABILITIES.PRINCIPALS_OWNER);
+  });
+
+  it('sends null rights to revoke access', async () => {
+    mockRequest.mockResolvedValue({
+      methodResponses: [['FileNode/set', { updated: { 'node-1': null } }, '0']],
+    });
+
+    await setFileNodeShare('node-1', 'principal-2', null);
+
+    const args = mockRequest.mock.calls[0][0][0][1];
+    expect(args.update['node-1']).toEqual({ 'shareWith/principal-2': null });
+  });
+
+  it('throws when the server rejects or does not confirm the update', async () => {
+    mockRequest.mockResolvedValue({
+      methodResponses: [
+        ['FileNode/set', { notUpdated: { 'node-1': { description: 'no mayShare right' } } }, '0'],
+      ],
+    });
+    await expect(setFileNodeShare('node-1', 'p2', null)).rejects.toThrow('no mayShare right');
+
+    mockRequest.mockResolvedValue({ methodResponses: [['FileNode/set', {}, '0']] });
+    await expect(setFileNodeShare('node-1', 'p2', null)).rejects.toThrow(
+      'Server did not confirm the share update',
+    );
+  });
+});
+
+describe('getAllFileNodesAcrossAccounts', () => {
+  it('namespaces ids of nodes from other principals and tags them isShared', async () => {
+    setSession({
+      primaryAccounts: { [CAPABILITIES.FILES]: 'acc-1' },
+      accounts: {
+        'acc-1': { name: 'me@example.com', isPersonal: true },
+        'acc-2': { name: 'Team', isPersonal: false },
+      },
+    });
+    mockRequest
+      .mockResolvedValueOnce({
+        methodResponses: [
+          ['FileNode/get', { list: [{ id: 'own-1', name: 'mine.txt', parentId: null, blobId: 'b1' }] }, '0'],
+        ],
+      })
+      .mockResolvedValueOnce({
+        methodResponses: [
+          ['FileNode/get', {
+            list: [
+              { id: 's1', name: 'Shared Folder', parentId: null, blobId: null },
+              { id: 's2', name: 'inside.txt', parentId: 's1', blobId: 'b2' },
+            ],
+          }, '0'],
+        ],
+      });
+
+    const nodes = await getAllFileNodesAcrossAccounts();
+
+    expect(nodes).toHaveLength(3);
+    const own = nodes.find((n) => n.id === 'own-1')!;
+    expect(own.isShared).toBe(false);
+    expect(isCrossAccountId(own.id)).toBe(false);
+
+    const folder = nodes.find((n) => n.name === 'Shared Folder')!;
+    expect(folder.id).toBe('acc-2:s1');
+    expect(folder.isShared).toBe(true);
+    expect(folder.accountId).toBe('acc-2');
+    expect(folder.accountName).toBe('Team');
+
+    // parentId is namespaced the same way so child lookups keep working.
+    const child = nodes.find((n) => n.name === 'inside.txt')!;
+    expect(child.parentId).toBe('acc-2:s1');
+  });
+
+  it('skips personal accounts without the filenode capability', async () => {
+    setSession({
+      primaryAccounts: { [CAPABILITIES.FILES]: 'acc-1' },
+      accounts: {
+        'acc-1': { name: 'me@example.com', isPersonal: true },
+        'acc-3': { name: 'other personal', isPersonal: true },
+      },
+    });
+    mockRequest.mockResolvedValue({
+      methodResponses: [['FileNode/get', { list: [] }, '0']],
+    });
+
+    await getAllFileNodesAcrossAccounts();
+
+    expect(mockRequest).toHaveBeenCalledTimes(1);
+    expect(mockRequest.mock.calls[0][0][0][1].accountId).toBe('acc-1');
+  });
+});
+
+describe('getFileNodeDownloadUrl', () => {
+  it('routes shared blobs to the owning account', () => {
+    const url = getFileNodeDownloadUrl({
+      id: 'acc-2:s2', name: 'inside.txt', type: 'text/plain',
+      blobId: 'b2', accountId: 'acc-2',
+    });
+    expect(url).toBe('https://dl/acc-2/b2');
+  });
+});
+
+describe('getPrincipals', () => {
+  it('queries then gets via back-reference', async () => {
+    mockRequest.mockResolvedValue({
+      methodResponses: [
+        ['Principal/query', { ids: ['p1'] }, '0'],
+        ['Principal/get', { list: [{ id: 'p1', name: 'other', type: 'individual' }] }, '1'],
+      ],
+    });
+
+    const principals = await getPrincipals();
+
+    expect(principals).toEqual([{ id: 'p1', name: 'other', type: 'individual' }]);
+    const calls = mockRequest.mock.calls[0][0];
+    expect(calls[0][0]).toBe('Principal/query');
+    expect(calls[1][0]).toBe('Principal/get');
+    expect(calls[1][1]['#ids']).toEqual({ resultOf: '0', name: 'Principal/query', path: '/ids' });
+  });
+
+  it('returns empty when the server lacks the principals capability', async () => {
+    mockHasCapability.mockReturnValue(false);
+    expect(await getPrincipals()).toEqual([]);
+    expect(mockRequest).not.toHaveBeenCalled();
+  });
+});

src/api/account-security.ts

@@ -0,0 +1,277 @@
+// Stalwart account-security management. Mirrors the webmail's
+// stores/account-security-store.ts, talking to Stalwart's JMAP extension
+// methods (x:AccountPassword, x:AppPassword, x:ApiKey, x:AccountSettings,
+// x:Account). The webmail proxies these through a server-side passthrough so
+// the basic-auth header stays in an httpOnly cookie; the mobile client already
+// holds its own credentials, so it calls the JMAP endpoint directly with the
+// `urn:stalwart:jmap` capability in `using`.
+
+import { jmapClient } from './jmap-client';
+import { CAPABILITIES } from './types';
+
+const STALWART_CAPABILITY = 'urn:stalwart:jmap';
+const STALWART_USING = [CAPABILITIES.CORE, STALWART_CAPABILITY];
+
+export type EncryptionType = 'Disabled' | 'Aes128' | 'Aes256';
+
+export interface AppCredentialInfo {
+  id: string;
+  description: string;
+  createdAt: string | null;
+  expiresAt: string | null;
+  allowedIps: string[];
+}
+
+export type AppPasswordInfo = AppCredentialInfo;
+export type ApiKeyInfo = AppCredentialInfo;
+
+export interface AppCredentialInput {
+  description: string;
+  expiresAt?: string | null;
+  allowedIps?: string[];
+}
+
+export interface AuthInfo {
+  otpEnabled: boolean;
+  appPasswords: AppPasswordInfo[];
+  apiKeys: ApiKeyInfo[];
+}
+
+export interface PrincipalInfo {
+  displayName: string;
+  emails: string[];
+  quota: number;
+  roles: string[];
+}
+
+type MethodResponse = [string, Record<string, any>, string];
+
+// True once a live session advertises Stalwart's JMAP extension. Without it
+// none of the x:* methods exist, so the screen shows a "not available" notice.
+export function isStalwartSupported(): boolean {
+  const session = jmapClient.currentSession;
+  if (!session) return false;
+  return STALWART_CAPABILITY in (session.capabilities ?? {});
+}
+
+// Pull a single method response out by its call id and throw on a JMAP method
+// error (the `['error', {type, description}, id]` envelope).
+function resultFor<T = Record<string, any>>(responses: MethodResponse[], callId: string): T {
+  const match = responses.find((r) => r[2] === callId);
+  if (!match) throw new Error(`Missing JMAP response for call ${callId}`);
+  if (match[0] === 'error') {
+    const err = match[1] as { type?: string; description?: string };
+    throw new Error(err.description || err.type || 'JMAP error');
+  }
+  return match[1] as T;
+}
+
+async function send(methodCalls: [string, Record<string, unknown>, string][]): Promise<MethodResponse[]> {
+  const res = await jmapClient.request(methodCalls, STALWART_USING);
+  return res.methodResponses as MethodResponse[];
+}
+
+function credentialFromResult(raw: Record<string, unknown>): AppCredentialInfo {
+  const allowedIps =
+    raw.allowedIps && typeof raw.allowedIps === 'object'
+      ? Object.keys(raw.allowedIps as Record<string, unknown>)
+      : [];
+  return {
+    id: String(raw.id ?? ''),
+    description: typeof raw.description === 'string' ? raw.description : '',
+    createdAt: typeof raw.createdAt === 'string' ? raw.createdAt : null,
+    expiresAt: typeof raw.expiresAt === 'string' ? raw.expiresAt : null,
+    allowedIps,
+  };
+}
+
+function ipsToMap(ips?: string[]): Record<string, true> | undefined {
+  if (!ips || ips.length === 0) return undefined;
+  return Object.fromEntries(ips.map((ip) => [ip, true]));
+}
+
+function buildCreateBody(input: AppCredentialInput): Record<string, unknown> {
+  const body: Record<string, unknown> = { description: input.description };
+  if (input.expiresAt) body.expiresAt = input.expiresAt;
+  const allowed = ipsToMap(input.allowedIps);
+  if (allowed) body.allowedIps = allowed;
+  return body;
+}
+
+function extractEncryptionType(raw: unknown): EncryptionType {
+  if (!raw || typeof raw !== 'object') return 'Disabled';
+  const type = (raw as { ['@type']?: string })['@type'];
+  if (type === 'Aes128' || type === 'Aes256') return type;
+  return 'Disabled';
+}
+
+// ── Reads ─────────────────────────────────────────────────
+
+export async function fetchAuthInfo(): Promise<AuthInfo> {
+  const accountId = jmapClient.accountId;
+  const responses = await send([
+    ['x:AccountPassword/get', { accountId, ids: ['singleton'] }, 'p'],
+    ['x:AppPassword/query', { accountId }, 'aq'],
+    ['x:ApiKey/query', { accountId }, 'kq'],
+  ]);
+
+  const passwordResult = resultFor<{ list?: Array<{ otpAuth?: { otpUrl?: string | null } }> }>(responses, 'p');
+  const appPwQuery = resultFor<{ ids?: string[] }>(responses, 'aq');
+  const apiKeyQuery = resultFor<{ ids?: string[] }>(responses, 'kq');
+
+  const otpAuth = passwordResult.list?.[0]?.otpAuth;
+  const otpEnabled = !!(otpAuth && typeof otpAuth === 'object' && otpAuth.otpUrl);
+
+  const followUps: [string, Record<string, unknown>, string][] = [];
+  if (appPwQuery.ids?.length) {
+    followUps.push(['x:AppPassword/get', { accountId, ids: appPwQuery.ids }, 'app']);
+  }
+  if (apiKeyQuery.ids?.length) {
+    followUps.push(['x:ApiKey/get', { accountId, ids: apiKeyQuery.ids }, 'key']);
+  }
+
+  let appPasswords: AppPasswordInfo[] = [];
+  let apiKeys: ApiKeyInfo[] = [];
+  if (followUps.length) {
+    const followUpResponses = await send(followUps);
+    if (appPwQuery.ids?.length) {
+      const r = resultFor<{ list?: Array<Record<string, unknown>> }>(followUpResponses, 'app');
+      appPasswords = (r.list ?? []).map(credentialFromResult);
+    }
+    if (apiKeyQuery.ids?.length) {
+      const r = resultFor<{ list?: Array<Record<string, unknown>> }>(followUpResponses, 'key');
+      apiKeys = (r.list ?? []).map(credentialFromResult);
+    }
+  }
+
+  return { otpEnabled, appPasswords, apiKeys };
+}
+
+export async function fetchEncryptionType(): Promise<EncryptionType> {
+  const accountId = jmapClient.accountId;
+  const responses = await send([['x:AccountSettings/get', { accountId, ids: ['singleton'] }, '0']]);
+  const result = resultFor<{ list?: Array<{ encryptionAtRest?: unknown }> }>(responses, '0');
+  return extractEncryptionType(result.list?.[0]?.encryptionAtRest);
+}
+
+export async function fetchPrincipal(): Promise<PrincipalInfo> {
+  const accountId = jmapClient.accountId;
+  const responses = await send([['x:Account/get', { accountId, ids: [accountId] }, '0']]);
+  const result = resultFor<{
+    list?: Array<{
+      description?: string | null;
+      aliases?: Record<string, { name?: string; enabled?: boolean }>;
+      quotas?: { maxDiskQuota?: number };
+      roles?: { ['@type']?: string };
+      name?: string;
+    }>;
+  }>(responses, '0');
+
+  const acc = result.list?.[0];
+  const aliasAddresses = acc?.aliases
+    ? Object.values(acc.aliases).flatMap((a) => (a && a.enabled !== false && a.name ? [a.name] : []))
+    : [];
+  const primaryEmail = acc?.name ? [acc.name] : [];
+  return {
+    displayName: acc?.description ?? '',
+    emails: [...primaryEmail, ...aliasAddresses],
+    quota: acc?.quotas?.maxDiskQuota ?? 0,
+    roles: acc?.roles?.['@type'] ? [acc.roles['@type']] : [],
+  };
+}
+
+// ── Mutations ─────────────────────────────────────────────
+
+export async function changePassword(currentPassword: string, newPassword: string): Promise<void> {
+  const accountId = jmapClient.accountId;
+  const responses = await send([
+    [
+      'x:AccountPassword/set',
+      { accountId, update: { singleton: { currentSecret: currentPassword, secret: newPassword } } },
+      '0',
+    ],
+  ]);
+  const result = resultFor<{ notUpdated?: Record<string, { description?: string; type?: string }> }>(responses, '0');
+  const failure = result.notUpdated?.singleton;
+  if (failure) throw new Error(failure.description || failure.type || 'Failed to change password');
+}
+
+export async function updateDisplayName(displayName: string): Promise<void> {
+  const accountId = jmapClient.accountId;
+  const responses = await send([
+    ['x:AccountSettings/set', { accountId, update: { singleton: { description: displayName } } }, '0'],
+  ]);
+  const result = resultFor<{ notUpdated?: Record<string, { description?: string; type?: string }> }>(responses, '0');
+  const failure = result.notUpdated?.singleton;
+  if (failure) throw new Error(failure.description || failure.type || 'Failed to update display name');
+}
+
+export async function enableTotp(currentPassword: string, otpUrl: string, otpCode: string): Promise<void> {
+  const accountId = jmapClient.accountId;
+  const responses = await send([
+    [
+      'x:AccountPassword/set',
+      { accountId, update: { singleton: { currentSecret: currentPassword, otpAuth: { otpUrl, otpCode } } } },
+      '0',
+    ],
+  ]);
+  const result = resultFor<{ notUpdated?: Record<string, { description?: string; type?: string }> }>(responses, '0');
+  const failure = result.notUpdated?.singleton;
+  if (failure) throw new Error(failure.description || failure.type || 'Failed to enable two-factor authentication');
+}
+
+export async function disableTotp(currentPassword: string): Promise<void> {
+  const accountId = jmapClient.accountId;
+  const responses = await send([
+    [
+      'x:AccountPassword/set',
+      { accountId, update: { singleton: { currentSecret: currentPassword, otpAuth: { otpUrl: null } } } },
+      '0',
+    ],
+  ]);
+  const result = resultFor<{ notUpdated?: Record<string, { description?: string; type?: string }> }>(responses, '0');
+  const failure = result.notUpdated?.singleton;
+  if (failure) throw new Error(failure.description || failure.type || 'Failed to disable two-factor authentication');
+}
+
+type SetMethod = 'x:AppPassword/set' | 'x:ApiKey/set';
+
+async function createCredential(method: SetMethod, input: AppCredentialInput): Promise<{ id: string; secret: string }> {
+  const accountId = jmapClient.accountId;
+  const tmpId = 'new';
+  const responses = await send([[method, { accountId, create: { [tmpId]: buildCreateBody(input) } }, '0']]);
+  const result = resultFor<{
+    created?: Record<string, { id: string; secret: string }>;
+    notCreated?: Record<string, { type?: string; description?: string }>;
+  }>(responses, '0');
+
+  const notCreated = result.notCreated?.[tmpId];
+  if (notCreated) throw new Error(notCreated.description || notCreated.type || 'Failed to create credential');
+  const created = result.created?.[tmpId];
+  if (!created?.id || !created.secret) throw new Error('Server did not return the created credential');
+  return { id: created.id, secret: created.secret };
+}
+
+async function removeCredential(method: SetMethod, id: string): Promise<void> {
+  const accountId = jmapClient.accountId;
+  const responses = await send([[method, { accountId, destroy: [id] }, '0']]);
+  const result = resultFor<{ notDestroyed?: Record<string, { description?: string; type?: string }> }>(responses, '0');
+  const failure = result.notDestroyed?.[id];
+  if (failure) throw new Error(failure.description || failure.type || 'Failed to remove credential');
+}
+
+export function createAppPassword(input: AppCredentialInput): Promise<{ id: string; secret: string }> {
+  return createCredential('x:AppPassword/set', input);
+}
+
+export function removeAppPassword(id: string): Promise<void> {
+  return removeCredential('x:AppPassword/set', id);
+}
+
+export function createApiKey(input: AppCredentialInput): Promise<{ id: string; secret: string }> {
+  return createCredential('x:ApiKey/set', input);
+}
+
+export function removeApiKey(id: string): Promise<void> {
+  return removeCredential('x:ApiKey/set', id);
+}

src/api/blob.ts

@@ -61,16 +61,70 @@ export async function uploadBlob(
   throw new Error('Upload succeeded but response did not include a blobId');
 }
 
+// Direct in-memory upload. The on-disk variant goes through expo-file-system's
+// `new File(uri).bytes()`, which is overkill when we already have the bytes
+// (e.g. the empty-blob trick used to create directories on Stalwart).
+export async function uploadBytes(
+  bytes: Uint8Array,
+  type: string,
+): Promise<{ blobId: string; size: number; type: string }> {
+  const session = jmapClient.currentSession;
+  if (!session) throw new Error('Not connected');
+
+  const uploadUrl = session.uploadUrl.replace(
+    '{accountId}',
+    encodeURIComponent(jmapClient.accountId),
+  );
+
+  const response = await secureFetch(uploadUrl, {
+    method: 'POST',
+    headers: {
+      'Content-Type': type || 'application/octet-stream',
+      Authorization: jmapClient.authHeader,
+    },
+    body: bytes.buffer as ArrayBuffer,
+  });
+
+  if (!response.ok) {
+    const detail = await response.text().catch(() => '');
+    throw new Error(`Upload failed: ${response.status}${detail ? ` ${detail}` : ''}`);
+  }
+
+  const raw = (await response.json()) as Record<string, unknown>;
+  const direct = raw as { blobId?: string; type?: string; size?: number };
+  if (typeof direct.blobId === 'string') {
+    return {
+      blobId: direct.blobId,
+      size: typeof direct.size === 'number' ? direct.size : bytes.byteLength,
+      type: typeof direct.type === 'string' && direct.type ? direct.type : type,
+    };
+  }
+  const nested = raw[jmapClient.accountId] as
+    | { blobId?: string; type?: string; size?: number }
+    | undefined;
+  if (nested?.blobId) {
+    return {
+      blobId: nested.blobId,
+      size: typeof nested.size === 'number' ? nested.size : bytes.byteLength,
+      type: typeof nested.type === 'string' && nested.type ? nested.type : type,
+    };
+  }
+  throw new Error('Upload succeeded but response did not include a blobId');
+}
+
 export function getDownloadUrl(
   blobId: string,
   name?: string,
   type?: string,
+  // Blobs of nodes shared by another principal live in the owner's account;
+  // downloading them with our own accountId 404s.
+  accountId?: string,
 ): string {
   const session = jmapClient.currentSession;
   if (!session) throw new Error('Not connected');
 
   return session.downloadUrl
-    .replace('{accountId}', encodeURIComponent(jmapClient.accountId))
+    .replace('{accountId}', encodeURIComponent(accountId ?? jmapClient.accountId))
     .replace('{blobId}', encodeURIComponent(blobId))
     .replace('{name}', encodeURIComponent(name ?? 'download'))
     .replace('{type}', encodeURIComponent(type ?? 'application/octet-stream'));

src/api/calendar.ts

@@ -4,12 +4,48 @@ import type { Calendar, CalendarEvent } from './types';
 
 const USING = [CAPABILITIES.CORE, CAPABILITIES.CALENDARS];
 
+/**
+ * IANA time zone of the device, sent as the `timeZone` argument on
+ * CalendarEvent/query and CalendarEvent/get. Stalwart interprets LocalDateTime
+ * filter values and computes utcStart/utcEnd for floating events in this zone,
+ * defaulting to UTC when absent — which shifts range boundaries and
+ * floating-event times for any user not in UTC. Stalwart ignores unparseable
+ * values, so sending it is always safe.
+ */
+function getUserTimeZone(): string | undefined {
+  try {
+    return Intl.DateTimeFormat().resolvedOptions().timeZone || undefined;
+  } catch {
+    return undefined;
+  }
+}
+
+/**
+ * Build a CalendarEvent/query filter restricting results to the given
+ * calendars. Stalwart implements the singular `inCalendar` condition (one
+ * calendar id per condition), not the draft's plural `inCalendars` array —
+ * sending the plural form fails the whole query with `unsupportedFilter`.
+ * Multiple calendars are expressed as an OR of singular conditions.
+ */
+function buildInCalendarFilter(calendarIds: string[]): Record<string, unknown> {
+  if (calendarIds.length === 1) {
+    return { inCalendar: calendarIds[0] };
+  }
+  return {
+    operator: 'OR',
+    conditions: calendarIds.map((id) => ({ inCalendar: id })),
+  };
+}
+
 const CALENDAR_EVENT_PROPERTIES = [
   'id', '@type', 'uid', 'calendarIds', 'title', 'description',
   'start', 'duration', 'timeZone', 'showWithoutTime',
   'utcStart', 'utcEnd', 'status', 'freeBusyStatus',
-  'participants', 'alerts', 'recurrenceRules',
+  'participants', 'alerts', 'useDefaultAlerts', 'recurrenceRules',
   'recurrenceOverrides', 'excludedRecurrenceRules',
+  'replyTo', 'organizerCalendarAddress', 'sequence',
+  'locations', 'virtualLocations',
+  'progress', 'due', 'priority', 'percentComplete',
   'links', 'created', 'updated',
 ];
 
@@ -23,43 +59,92 @@ function methodResult<T = any>(res: any, index = 0): T {
   return entry[1] as T;
 }
 
+// Other session accounts that expose the calendars capability hold calendars
+// shared with the user (JMAP surfaces shared data under the sharer's account).
+function sharedCalendarAccountIds(): string[] {
+  const session = jmapClient.currentSession;
+  const primary = jmapClient.accountId;
+  return Object.entries(session?.accounts ?? {})
+    .filter(([id, info]) =>
+      id !== primary && !!info.accountCapabilities?.[CAPABILITIES.CALENDARS])
+    .map(([id]) => id);
+}
+
 export async function getCalendars(): Promise<Calendar[]> {
   const accountId = jmapClient.accountId;
   const res = await jmapClient.request(
     [['Calendar/get', { accountId }, '0']],
     USING,
   );
-  return methodResult<{ list: Calendar[] }>(res).list ?? [];
+  const own = methodResult<{ list: Calendar[] }>(res).list ?? [];
+
+  // Calendars shared with the user live in other session accounts. Failures
+  // there (revoked share, transient error) must not hide the user's own
+  // calendars, so each shared account is fetched best-effort.
+  const shared = await Promise.all(
+    sharedCalendarAccountIds().map(async (sharedAccountId) => {
+      try {
+        const sharedRes = await jmapClient.request(
+          [['Calendar/get', { accountId: sharedAccountId }, '0']],
+          USING,
+        );
+        const list = methodResult<{ list: Calendar[] }>(sharedRes).list ?? [];
+        // JMAP calendar ids are only unique within an account, so a shared
+        // "default" calendar collides with the user's own "default". Namespace
+        // the id (keeping the real id in originalId) so visibility toggles,
+        // event-query routing, and create/default mutations don't cross wires.
+        // Mirrors webmail's getAllCalendars.
+        return list.map((cal) => ({
+          ...cal,
+          id: `${sharedAccountId}:${cal.id}`,
+          originalId: cal.id,
+          accountId: sharedAccountId,
+          isShared: true,
+        }));
+      } catch {
+        return [];
+      }
+    }),
+  );
+  return [...own, ...shared.flat()];
 }
 
 export async function queryEvents(
-  _calendarIds: string[],
+  calendarIds: string[],
   _after: string,
   _before: string,
+  accountId?: string,
 ): Promise<string[]> {
-  // Stalwart rejects inCalendars/after/before filters on CalendarEvent/query.
-  // Fetch all events in the account; calendar visibility + date filtering is
-  // done client-side.
-  const accountId = jmapClient.accountId;
+  // Stalwart rejects after/before filters on CalendarEvent/query; date
+  // filtering is done client-side. Calendars are restricted via the singular
+  // `inCalendar` condition (the plural `inCalendars` fails the whole query
+  // with unsupportedFilter on Stalwart).
+  const account = accountId || jmapClient.accountId;
+  const args: Record<string, unknown> = { accountId: account, limit: 1000 };
+  const timeZone = getUserTimeZone();
+  if (timeZone) args.timeZone = timeZone;
+  if (calendarIds.length > 0) args.filter = buildInCalendarFilter(calendarIds);
   const res = await jmapClient.request(
-    [['CalendarEvent/query', { accountId, limit: 1000 }, '0']],
+    [['CalendarEvent/query', args, '0']],
     USING,
   );
   return methodResult<{ ids: string[] }>(res).ids ?? [];
 }
 
-export async function getEvents(ids: string[]): Promise<CalendarEvent[]> {
+export async function getEvents(ids: string[], accountId?: string): Promise<CalendarEvent[]> {
   if (ids.length === 0) return [];
-  const accountId = jmapClient.accountId;
+  const account = accountId || jmapClient.accountId;
+  const timeZone = getUserTimeZone();
   const batchSize = jmapClient.getMaxObjectsInGet();
   const all: CalendarEvent[] = [];
   for (let i = 0; i < ids.length; i += batchSize) {
     const batch = ids.slice(i, i + batchSize);
     const res = await jmapClient.request(
       [['CalendarEvent/get', {
-        accountId,
+        accountId: account,
         ids: batch,
         properties: CALENDAR_EVENT_PROPERTIES,
+        ...(timeZone ? { timeZone } : {}),
       }, '0']],
       USING,
     );
@@ -69,38 +154,187 @@ export async function getEvents(ids: string[]): Promise<CalendarEvent[]> {
   return all;
 }
 
+// `sendSchedulingMessages` asks Stalwart to deliver iMIP (RFC 6047) invitation
+// / reply / cancellation emails to participants. We pass it whenever an event
+// has participants so creating/updating/deleting a meeting notifies attendees.
+function setArgs(
+  accountId: string,
+  payload: Record<string, unknown>,
+  sendSchedulingMessages?: boolean,
+): Record<string, unknown> {
+  const args: Record<string, unknown> = { accountId, ...payload };
+  if (sendSchedulingMessages !== undefined) {
+    args.sendSchedulingMessages = sendSchedulingMessages;
+  }
+  return args;
+}
+
 export async function createEvent(
   event: Partial<CalendarEvent>,
   calendarId: string,
+  sendSchedulingMessages?: boolean,
+  targetAccountId?: string,
 ): Promise<CalendarEvent> {
-  const accountId = jmapClient.accountId;
+  const accountId = targetAccountId || jmapClient.accountId;
   const res = await jmapClient.request(
-    [['CalendarEvent/set', {
-      accountId,
+    [['CalendarEvent/set', setArgs(accountId, {
       create: {
         'new-event': { ...event, calendarIds: { [calendarId]: true } },
       },
-    }, '0']],
+    }, sendSchedulingMessages), '0']],
     USING,
   );
-  return res.methodResponses[0][1].created['new-event'];
+  const result = methodResult<{
+    created?: Record<string, CalendarEvent>;
+    notCreated?: Record<string, { description?: string; type?: string }>;
+  }>(res);
+  const created = result.created?.['new-event'];
+  if (!created) {
+    const err = result.notCreated?.['new-event'];
+    throw new Error(err?.description || err?.type || 'Failed to create event');
+  }
+  return created;
+}
+
+// Batch-create many events in one CalendarEvent/set. Returns the number created.
+export async function batchCreateEvents(
+  events: Partial<CalendarEvent>[],
+  calendarId: string,
+  targetAccountId?: string,
+): Promise<number> {
+  if (events.length === 0) return 0;
+  const accountId = targetAccountId || jmapClient.accountId;
+  const create: Record<string, Partial<CalendarEvent>> = {};
+  events.forEach((e, i) => {
+    create[`evt-${i}`] = { ...e, calendarIds: { [calendarId]: true } };
+  });
+  const res = await jmapClient.request(
+    [['CalendarEvent/set', { accountId, create }, '0']],
+    USING,
+  );
+  const result = methodResult<{ created?: Record<string, unknown> }>(res);
+  return result.created ? Object.keys(result.created).length : 0;
 }
 
 export async function updateEvent(
   id: string,
-  changes: Partial<CalendarEvent>,
+  changes: Partial<CalendarEvent> | Record<string, unknown>,
+  sendSchedulingMessages?: boolean,
+  targetAccountId?: string,
 ): Promise<void> {
-  const accountId = jmapClient.accountId;
+  const accountId = targetAccountId || jmapClient.accountId;
+  const res = await jmapClient.request(
+    [['CalendarEvent/set', setArgs(accountId, { update: { [id]: changes } }, sendSchedulingMessages), '0']],
+    USING,
+  );
+  const result = methodResult<{ notUpdated?: Record<string, { description?: string; type?: string }> }>(res);
+  const err = result.notUpdated?.[id];
+  if (err) throw new Error(err.description || err.type || 'Failed to update event');
+}
+
+export async function deleteEvents(
+  ids: string[],
+  sendSchedulingMessages?: boolean,
+  targetAccountId?: string,
+): Promise<void> {
+  const accountId = targetAccountId || jmapClient.accountId;
   await jmapClient.request(
-    [['CalendarEvent/set', { accountId, update: { [id]: changes } }, '0']],
+    [['CalendarEvent/set', setArgs(accountId, { destroy: ids }, sendSchedulingMessages), '0']],
     USING,
   );
 }
 
-export async function deleteEvents(ids: string[]): Promise<void> {
+// RSVP to an invitation: patch the participant's participationStatus via a JSON
+// Pointer (RFC 6901) and let Stalwart send the iTIP REPLY (sendSchedulingMessages).
+export async function rsvpEvent(
+  eventId: string,
+  participantId: string,
+  status: 'accepted' | 'declined' | 'tentative',
+  replyTo?: Record<string, string> | null,
+  targetAccountId?: string,
+): Promise<void> {
+  const accountId = targetAccountId || jmapClient.accountId;
+  // Escape per RFC 6901: ~ → ~0, / → ~1.
+  const escaped = participantId.replace(/~/g, '~0').replace(/\//g, '~1');
+  const patch: Record<string, unknown> = {
+    [`participants/${escaped}/participationStatus`]: status,
+  };
+  if (replyTo) patch.replyTo = replyTo;
+  const res = await jmapClient.request(
+    [['CalendarEvent/set', { accountId, update: { [eventId]: patch }, sendSchedulingMessages: true }, '0']],
+    USING,
+  );
+  const result = methodResult<{ notUpdated?: Record<string, { description?: string; type?: string }> }>(res);
+  const err = result.notUpdated?.[eventId];
+  if (err) throw new Error(err.description || err.type || 'Failed to send RSVP');
+}
+
+// Parse an uploaded .ics blob into one or more JSCalendar events (server-side).
+export async function parseCalendarBlob(blobId: string): Promise<Partial<CalendarEvent>[]> {
+  const accountId = jmapClient.accountId;
+  const res = await jmapClient.request(
+    [['CalendarEvent/parse', { accountId, blobIds: [blobId] }, '0']],
+    USING,
+  );
+  const result = methodResult<{
+    parsed?: Record<string, CalendarEvent | CalendarEvent[]>;
+    notParsable?: string[];
+    notFound?: string[];
+  }>(res);
+  if (result.notParsable?.includes(blobId)) throw new Error('Invalid calendar file format');
+  if (result.notFound?.includes(blobId)) throw new Error('Uploaded file not found');
+  const parsed = result.parsed?.[blobId];
+  if (!parsed) return [];
+  return Array.isArray(parsed) ? parsed : [parsed];
+}
+
+export async function createCalendar(
+  name: string,
+  color?: string,
+): Promise<Calendar> {
+  const accountId = jmapClient.accountId;
+  const res = await jmapClient.request(
+    [['Calendar/set', {
+      accountId,
+      create: { 'new-cal': { name, color, isVisible: true, isSubscribed: true } },
+    }, '0']],
+    USING,
+  );
+  const result = methodResult<{
+    created?: Record<string, Calendar>;
+    notCreated?: Record<string, { description?: string; type?: string }>;
+  }>(res);
+  const created = result.created?.['new-cal'];
+  if (!created) {
+    const err = result.notCreated?.['new-cal'];
+    throw new Error(err?.description || err?.type || 'Failed to create calendar');
+  }
+  return created;
+}
+
+/**
+ * Mark a calendar as the account default. `isDefault` is read-only in
+ * Stalwart's Calendar/set — the default is changed via the
+ * `onSuccessSetIsDefault` request argument instead.
+ */
+export async function setDefaultCalendar(
+  calendarId: string,
+  targetAccountId?: string,
+): Promise<void> {
+  const accountId = targetAccountId || jmapClient.accountId;
+  const res = await jmapClient.request(
+    [['Calendar/set', { accountId, onSuccessSetIsDefault: calendarId }, '0']],
+    USING,
+  );
+  methodResult(res);
+}
+
+// Destroy a calendar. `onDestroyEvents: 'destroy'` removes its events too —
+// Stalwart otherwise refuses to delete a non-empty calendar.
+export async function deleteCalendar(id: string): Promise<void> {
   const accountId = jmapClient.accountId;
   await jmapClient.request(
-    [['CalendarEvent/set', { accountId, destroy: ids }, '0']],
+    [['Calendar/set', { accountId, destroy: [id], onDestroyRemoveEvents: true }, '0']],
     USING,
   );
 }

src/api/contacts.ts

@@ -91,3 +91,58 @@ export async function deleteContacts(ids: string[]): Promise<void> {
     USING,
   );
 }
+
+export async function createAddressBook(name: string): Promise<AddressBook> {
+  const accountId = jmapClient.accountId;
+  const res = await jmapClient.request(
+    [['AddressBook/set', { accountId, create: { 'new-book': { name } } }, '0']],
+    USING,
+  );
+  const result = methodResult<{
+    created?: Record<string, AddressBook>;
+    notCreated?: Record<string, { description?: string; type?: string }>;
+  }>(res);
+  const created = result.created?.['new-book'];
+  if (created) return { ...created, name };
+  const err = result.notCreated?.['new-book'];
+  throw new Error(err?.description || err?.type || 'Failed to create address book');
+}
+
+export async function updateAddressBook(
+  id: string,
+  updates: Partial<AddressBook>,
+): Promise<void> {
+  const accountId = jmapClient.accountId;
+  // Only forward server-settable properties.
+  const { name, description, sortOrder, isDefault } = updates as Record<string, unknown>;
+  const patch: Record<string, unknown> = {};
+  if (name !== undefined) patch.name = name;
+  if (description !== undefined) patch.description = description;
+  if (sortOrder !== undefined) patch.sortOrder = sortOrder;
+  if (isDefault !== undefined) patch.isDefault = isDefault;
+
+  const res = await jmapClient.request(
+    [['AddressBook/set', { accountId, update: { [id]: patch } }, '0']],
+    USING,
+  );
+  const result = methodResult<{ notUpdated?: Record<string, { description?: string; type?: string }> }>(res);
+  const err = result.notUpdated?.[id];
+  if (err) throw new Error(err.description || err.type || 'Failed to update address book');
+}
+
+export async function deleteAddressBook(id: string): Promise<void> {
+  const accountId = jmapClient.accountId;
+  const res = await jmapClient.request(
+    [['AddressBook/set', { accountId, destroy: [id] }, '0']],
+    USING,
+  );
+  const result = methodResult<{ notDestroyed?: Record<string, { description?: string; type?: string }> }>(res);
+  const err = result.notDestroyed?.[id];
+  if (err) throw new Error(err.description || err.type || 'Failed to delete address book');
+}
+
+/** Fetch all contact cards that live in a specific address book. */
+export async function getContactsInBook(addressBookId: string): Promise<ContactCard[]> {
+  const ids = await queryContacts({ inAddressBook: addressBookId });
+  return getContacts(ids);
+}

src/api/email.ts

@@ -22,6 +22,55 @@ export async function getMailboxes(): Promise<Mailbox[]> {
   return res.methodResponses[0][1].list;
 }
 
+// Variant that also returns the JMAP `state` token so callers can later issue
+// Mailbox/changes(sinceState=…) to fetch only what changed.
+export async function getMailboxesWithState(): Promise<{ list: Mailbox[]; state: string }> {
+  const accountId = jmapClient.accountId;
+  const res = await jmapClient.request(
+    [['Mailbox/get', { accountId }, '0']],
+  );
+  const body = res.methodResponses[0][1];
+  return { list: body.list as Mailbox[], state: body.state as string };
+}
+
+export async function getMailboxesByIds(ids: string[]): Promise<{ list: Mailbox[]; state: string }> {
+  if (ids.length === 0) return { list: [], state: '' };
+  const accountId = jmapClient.accountId;
+  const res = await jmapClient.request(
+    [['Mailbox/get', { accountId, ids }, '0']],
+  );
+  const body = res.methodResponses[0][1];
+  return { list: body.list as Mailbox[], state: body.state as string };
+}
+
+export interface MailboxChangesResult {
+  oldState: string;
+  newState: string;
+  hasMoreChanges: boolean;
+  created: string[];
+  updated: string[];
+  destroyed: string[];
+}
+
+// Returns null when the server can't compute the diff (typically
+// `cannotCalculateChanges`); callers should fall back to a full Mailbox/get.
+export async function getMailboxChanges(sinceState: string): Promise<MailboxChangesResult | null> {
+  const accountId = jmapClient.accountId;
+  const res = await jmapClient.request(
+    [['Mailbox/changes', { accountId, sinceState }, '0']],
+  );
+  const [name, body] = res.methodResponses[0];
+  if (name === 'error') return null;
+  return {
+    oldState: body.oldState as string,
+    newState: body.newState as string,
+    hasMoreChanges: Boolean(body.hasMoreChanges),
+    created: (body.created as string[]) ?? [],
+    updated: (body.updated as string[]) ?? [],
+    destroyed: (body.destroyed as string[]) ?? [],
+  };
+}
+
 export async function createMailbox(
   data: { name: string; parentId?: string | null },
 ): Promise<string> {
@@ -83,6 +132,22 @@ export async function deleteMailbox(id: string): Promise<void> {
   }
 }
 
+function buildMailboxQueryFilter(
+  mailboxId: string,
+  userFilter: Record<string, unknown> | undefined,
+): Record<string, unknown> {
+  const inMailbox = { inMailbox: mailboxId };
+  // JMAP filters are either a FilterCondition or a FilterOperator (operator +
+  // conditions) — never both. Spreading a FilterOperator next to `inMailbox`
+  // produces a hybrid object that servers reduce to the FilterCondition,
+  // silently dropping the operator's conditions (e.g. the "unread" toggle).
+  if (!userFilter || Object.keys(userFilter).length === 0) return inMailbox;
+  if ('operator' in userFilter) {
+    return { operator: 'AND', conditions: [inMailbox, userFilter] };
+  }
+  return { ...inMailbox, ...userFilter };
+}
+
 export async function queryEmails(
   mailboxId: string,
   options?: {
@@ -91,21 +156,69 @@ export async function queryEmails(
     sort?: Array<{ property: string; isAscending: boolean }>;
     filter?: Record<string, unknown>;
   },
-): Promise<{ ids: string[]; total: number }> {
+): Promise<{ ids: string[]; total: number; queryState?: string }> {
   const accountId = jmapClient.accountId;
+  const filter = buildMailboxQueryFilter(mailboxId, options?.filter);
   const res = await jmapClient.request([
     ['Email/query', {
       accountId,
-      filter: { inMailbox: mailboxId, ...options?.filter },
+      filter,
       sort: options?.sort ?? [{ property: 'receivedAt', isAscending: false }],
       position: options?.position ?? 0,
       limit: options?.limit ?? 50,
       calculateTotal: true,
     }, '0'],
   ]);
+  const body = res.methodResponses[0][1];
   return {
-    ids: res.methodResponses[0][1].ids,
-    total: res.methodResponses[0][1].total,
+    ids: body.ids,
+    total: body.total,
+    queryState: body.queryState as string | undefined,
+  };
+}
+
+export interface EmailQueryChangesResult {
+  oldQueryState: string;
+  newQueryState: string;
+  total: number;
+  removed: string[];
+  added: Array<{ id: string; index: number }>;
+}
+
+// Run Email/queryChanges for the standard "by receivedAt desc, in this mailbox"
+// query. Returns null when the server replies with `cannotCalculateChanges`
+// (or any other error) — caller should fall back to a fresh Email/query.
+export async function getEmailQueryChanges(
+  mailboxId: string,
+  sinceQueryState: string,
+  options?: {
+    sort?: Array<{ property: string; isAscending: boolean }>;
+    filter?: Record<string, unknown>;
+    upToId?: string;
+    maxChanges?: number;
+  },
+): Promise<EmailQueryChangesResult | null> {
+  const accountId = jmapClient.accountId;
+  const filter = buildMailboxQueryFilter(mailboxId, options?.filter);
+  const args: Record<string, unknown> = {
+    accountId,
+    filter,
+    sort: options?.sort ?? [{ property: 'receivedAt', isAscending: false }],
+    sinceQueryState,
+    calculateTotal: true,
+  };
+  if (options?.upToId) args.upToId = options.upToId;
+  if (options?.maxChanges) args.maxChanges = options.maxChanges;
+
+  const res = await jmapClient.request([['Email/queryChanges', args, '0']]);
+  const [name, body] = res.methodResponses[0];
+  if (name === 'error') return null;
+  return {
+    oldQueryState: body.oldQueryState as string,
+    newQueryState: body.newQueryState as string,
+    total: (body.total as number) ?? 0,
+    removed: (body.removed as string[]) ?? [],
+    added: (body.added as Array<{ id: string; index: number }>) ?? [],
   };
 }
 
@@ -117,8 +230,63 @@ export async function getEmails(ids: string[]): Promise<Email[]> {
   return res.methodResponses[0][1].list;
 }
 
-export async function getFullEmail(id: string): Promise<Email> {
+// Returns the Email/get response with the JMAP `state` token. Used by the
+// store so we can later issue Email/changes(sinceState=…) for incremental
+// updates instead of re-fetching the full list.
+export async function getEmailsWithState(ids: string[]): Promise<{ list: Email[]; state: string }> {
+  if (ids.length === 0) {
+    // Email/get with an empty id list still returns a state token; useful for
+    // priming the store after an empty mailbox query.
+    const accountId = jmapClient.accountId;
+    const res = await jmapClient.request([
+      ['Email/get', { accountId, ids: [], properties: EMAIL_LIST_PROPERTIES }, '0'],
+    ]);
+    const body = res.methodResponses[0][1];
+    return { list: [], state: body.state as string };
+  }
   const accountId = jmapClient.accountId;
+  const res = await jmapClient.request([
+    ['Email/get', { accountId, ids, properties: EMAIL_LIST_PROPERTIES }, '0'],
+  ]);
+  const body = res.methodResponses[0][1];
+  return { list: body.list as Email[], state: body.state as string };
+}
+
+export interface EmailChangesResult {
+  oldState: string;
+  newState: string;
+  hasMoreChanges: boolean;
+  created: string[];
+  updated: string[];
+  destroyed: string[];
+}
+
+// Returns null when the server replies with `cannotCalculateChanges` or any
+// other error response; caller should treat that as "rebuild from scratch".
+export async function getEmailChanges(
+  sinceState: string,
+  maxChanges?: number,
+): Promise<EmailChangesResult | null> {
+  const accountId = jmapClient.accountId;
+  const args: Record<string, unknown> = { accountId, sinceState };
+  if (maxChanges) args.maxChanges = maxChanges;
+  const res = await jmapClient.request([['Email/changes', args, '0']]);
+  const [name, body] = res.methodResponses[0];
+  if (name === 'error') return null;
+  return {
+    oldState: body.oldState as string,
+    newState: body.newState as string,
+    hasMoreChanges: Boolean(body.hasMoreChanges),
+    created: (body.created as string[]) ?? [],
+    updated: (body.updated as string[]) ?? [],
+    destroyed: (body.destroyed as string[]) ?? [],
+  };
+}
+
+export async function getFullEmail(id: string, accountIdOverride?: string): Promise<Email> {
+  // `accountIdOverride` lets the unified inbox open a message that lives under
+  // a group/shared account in the same session instead of the user's own.
+  const accountId = accountIdOverride ?? jmapClient.accountId;
   const res = await jmapClient.request([
     ['Email/get', {
       accountId,
@@ -155,6 +323,35 @@ export async function getFullEmails(ids: string[]): Promise<Email[]> {
   return res.methodResponses[0][1].list as Email[];
 }
 
+/**
+ * Import an already-uploaded raw MIME message (a `.eml` blob) into a mailbox
+ * via JMAP `Email/import`. Returns the new email id. Mirrors the webmail's
+ * `importRawEmail` import step.
+ */
+export async function importEmailBlob(
+  blobId: string,
+  mailboxId: string,
+  keywords: Record<string, boolean> = { $seen: true },
+): Promise<string> {
+  const accountId = jmapClient.accountId;
+  const res = await jmapClient.request([
+    ['Email/import', {
+      accountId,
+      emails: {
+        'import-0': { blobId, mailboxIds: { [mailboxId]: true }, keywords },
+      },
+    }, '0'],
+  ]);
+  const result = res.methodResponses[0][1];
+  const notCreated = result?.notCreated?.['import-0'];
+  if (notCreated) {
+    throw new Error(notCreated.description || notCreated.type || 'Failed to import email');
+  }
+  const id = result?.created?.['import-0']?.id;
+  if (!id) throw new Error('Email import succeeded but no id was returned');
+  return id;
+}
+
 export async function getThread(threadId: string): Promise<Thread> {
   const accountId = jmapClient.accountId;
   const res = await jmapClient.request(
@@ -166,8 +363,9 @@ export async function getThread(threadId: string): Promise<Thread> {
 export async function setEmailKeywords(
   emailId: string,
   keywords: Record<string, boolean>,
+  accountIdOverride?: string,
 ): Promise<void> {
-  const accountId = jmapClient.accountId;
+  const accountId = accountIdOverride ?? jmapClient.accountId;
   await jmapClient.request([
     ['Email/set', { accountId, update: { [emailId]: { keywords } } }, '0'],
   ]);
@@ -192,6 +390,50 @@ export async function moveEmail(
   ]);
 }
 
+// Move several emails from one mailbox to another in a single Email/set.
+export async function moveEmails(
+  ids: string[],
+  fromMailboxId: string,
+  toMailboxId: string,
+): Promise<void> {
+  if (ids.length === 0) return;
+  const accountId = jmapClient.accountId;
+  const update: Record<string, Record<string, unknown>> = {};
+  for (const id of ids) {
+    update[id] = {
+      [`mailboxIds/${fromMailboxId}`]: null,
+      [`mailboxIds/${toMailboxId}`]: true,
+    };
+  }
+  await jmapClient.request([['Email/set', { accountId, update }, '0']]);
+}
+
+// Batch delete: destroy outright when already in trash, otherwise move to trash.
+export async function deleteEmails(
+  ids: string[],
+  trashMailboxId: string,
+  currentMailboxId: string,
+): Promise<void> {
+  if (ids.length === 0) return;
+  if (currentMailboxId === trashMailboxId) {
+    const accountId = jmapClient.accountId;
+    await jmapClient.request([['Email/set', { accountId, destroy: ids }, '0']]);
+  } else {
+    await moveEmails(ids, currentMailboxId, trashMailboxId);
+  }
+}
+
+// Apply keyword maps to several emails in one round-trip.
+export async function setKeywordsForEmails(
+  updates: Array<{ id: string; keywords: Record<string, boolean> }>,
+): Promise<void> {
+  if (updates.length === 0) return;
+  const accountId = jmapClient.accountId;
+  const update: Record<string, { keywords: Record<string, boolean> }> = {};
+  for (const u of updates) update[u.id] = { keywords: u.keywords };
+  await jmapClient.request([['Email/set', { accountId, update }, '0']]);
+}
+
 // Restore each email's mailboxIds to the snapshot supplied. Used by undo to
 // reverse a move/archive/spam in one round-trip. JMAP "mailboxIds" replaces
 // the entire map, so we don't need to compute a diff against the current state.
@@ -213,6 +455,25 @@ export async function restoreEmailMailboxes(
   ]);
 }
 
+// Replace one email's full mailboxIds map. JMAP "mailboxIds" assigns the whole
+// set, so this is idempotent — replaying it produces the same result no matter
+// the current server state. The offline outbox relies on that to coalesce and
+// safely retry move/archive/trash operations.
+export async function setEmailMailboxes(
+  emailId: string,
+  mailboxIds: Record<string, boolean>,
+): Promise<void> {
+  await restoreEmailMailboxes([{ id: emailId, mailboxIds }]);
+}
+
+// Permanently destroy emails (no move-to-trash). Idempotent: destroying an
+// already-gone id is a no-op on replay.
+export async function destroyEmails(ids: string[]): Promise<void> {
+  if (ids.length === 0) return;
+  const accountId = jmapClient.accountId;
+  await jmapClient.request([['Email/set', { accountId, destroy: ids }, '0']]);
+}
+
 // Archive one or more emails into the archive mailbox, optionally auto-sorting
 // into year or year/month subfolders. Mirrors the webmail implementation in
 // lib/jmap/client.ts so behavior stays in sync between platforms.
@@ -392,6 +653,15 @@ export interface OutgoingAttachment {
   cid?: string;
 }
 
+export interface SendEmailResult {
+  /** True when the message was deferred (HOLDFOR / FUTURERELEASE). */
+  scheduled: boolean;
+  /** ISO timestamp the server resolved for a deferred send, when known. */
+  sendAt?: string;
+  emailId?: string;
+  emailSubmissionId?: string;
+}
+
 export async function sendEmail(
   email: {
     from: EmailAddress[];
@@ -407,7 +677,11 @@ export async function sendEmail(
   },
   identityId: string,
   sentMailboxId: string,
-): Promise<void> {
+  // When > 0 the message is held for this many seconds before delivery via the
+  // SMTP HOLDFOR parameter (FUTURERELEASE). Used for both explicit "send later"
+  // scheduling and the global send-delay (undo-send) window.
+  holdForSeconds?: number,
+): Promise<SendEmailResult> {
   const accountId = jmapClient.accountId;
   const emailCreate: Record<string, unknown> = {
     from: email.from,
@@ -449,14 +723,164 @@ export async function sendEmail(
     emailCreate['header:References:asText'] = email.references ?? email.inReplyTo;
   }
 
-  await jmapClient.request(
+  const submissionCreate: Record<string, unknown> = { emailId: '#draft', identityId };
+  // For a deferred send the envelope must be set explicitly so the HOLDFOR
+  // mail-from parameter rides along (JMAP §7.3: an omitted envelope makes the
+  // server derive mailFrom from the Identity, dropping our parameter).
+  if (holdForSeconds && holdForSeconds > 0) {
+    const rcptTo = [...email.to, ...(email.cc ?? []), ...(email.bcc ?? [])]
+      .map((r) => r.email.trim())
+      .filter(Boolean)
+      .map((address) => ({ email: address }));
+    submissionCreate.envelope = {
+      mailFrom: {
+        email: email.from[0]?.email,
+        parameters: { HOLDFOR: String(Math.ceil(holdForSeconds)) },
+      },
+      rcptTo,
+    };
+  }
+
+  const res = await jmapClient.request(
     [
       ['Email/set', { accountId, create: { draft: emailCreate } }, '0'],
       ['EmailSubmission/set', {
         accountId,
-        create: { 'sub-1': { emailId: '#draft', identityId } },
+        create: { 'sub-1': submissionCreate },
       }, '1'],
     ],
     [CAPABILITIES.CORE, CAPABILITIES.MAIL, CAPABILITIES.SUBMISSION],
   );
+
+  let emailId: string | undefined;
+  let emailSubmissionId: string | undefined;
+  let sendAt: string | undefined;
+  for (const [methodName, result] of res.methodResponses) {
+    if (methodName.endsWith('/error')) {
+      throw new Error((result as { description?: string }).description ?? 'Send failed');
+    }
+    if (methodName === 'Email/set') {
+      const notCreated = (result as { notCreated?: Record<string, { description?: string; type?: string }> }).notCreated?.draft;
+      if (notCreated) throw new Error(notCreated.description ?? notCreated.type ?? 'Failed to create message');
+      emailId = (result as { created?: Record<string, { id?: string }> }).created?.draft?.id;
+    }
+    if (methodName === 'EmailSubmission/set') {
+      const notCreated = (result as { notCreated?: Record<string, { description?: string; type?: string }> }).notCreated?.['sub-1'];
+      if (notCreated) throw new Error(notCreated.description ?? notCreated.type ?? 'Failed to submit message');
+      const created = (result as { created?: Record<string, { id?: string; sendAt?: string }> }).created?.['sub-1'];
+      emailSubmissionId = created?.id;
+      sendAt = created?.sendAt;
+    }
+  }
+
+  return {
+    scheduled: !!(holdForSeconds && holdForSeconds > 0),
+    sendAt,
+    emailId,
+    emailSubmissionId,
+  };
+}
+
+export interface ScheduledEmail {
+  emailSubmissionId: string;
+  emailId: string;
+  identityId: string;
+  threadId?: string;
+  sendAt: string;
+  undoStatus?: string;
+  subject?: string;
+  to?: EmailAddress[];
+  from?: EmailAddress[];
+  preview?: string;
+}
+
+// List pending (not-yet-delivered, not cancelled) scheduled submissions whose
+// send time is still in the future, joined with a light Email/get so the UI
+// can show subject/recipients. Empty when the server lacks FUTURERELEASE.
+export async function listScheduledEmails(): Promise<ScheduledEmail[]> {
+  if (!jmapClient.hasDelayedSend()) return [];
+  const accountId = jmapClient.accountId;
+  const now = Date.now();
+
+  const queryRes = await jmapClient.request(
+    [['EmailSubmission/query', { accountId, limit: 200 }, '0']],
+    [CAPABILITIES.CORE, CAPABILITIES.SUBMISSION],
+  );
+  const [queryName, queryBody] = queryRes.methodResponses[0];
+  if (queryName.endsWith('/error')) return [];
+  const ids = (queryBody.ids as string[]) ?? [];
+  if (ids.length === 0) return [];
+
+  const subRes = await jmapClient.request(
+    [['EmailSubmission/get', {
+      accountId,
+      ids,
+      properties: ['id', 'emailId', 'identityId', 'threadId', 'sendAt', 'undoStatus'],
+    }, '0']],
+    [CAPABILITIES.CORE, CAPABILITIES.SUBMISSION],
+  );
+  const submissions = ((subRes.methodResponses[0][1].list as Array<{
+    id: string;
+    emailId: string;
+    identityId: string;
+    threadId?: string;
+    sendAt?: string;
+    undoStatus?: string;
+  }>) ?? []).filter((s) => {
+    if (s.undoStatus !== 'pending' || !s.sendAt) return false;
+    const t = new Date(s.sendAt).getTime();
+    return Number.isFinite(t) && t > now;
+  });
+  if (submissions.length === 0) return [];
+
+  const emailIds = Array.from(new Set(submissions.map((s) => s.emailId)));
+  const emailRes = await jmapClient.request([
+    ['Email/get', {
+      accountId,
+      ids: emailIds,
+      properties: ['id', 'subject', 'to', 'from', 'preview', 'threadId'],
+    }, '0'],
+  ]);
+  const emailById = new Map(
+    ((emailRes.methodResponses[0][1].list as Email[]) ?? []).map((e) => [e.id, e]),
+  );
+
+  return submissions
+    .map((s): ScheduledEmail | null => {
+      const e = emailById.get(s.emailId);
+      if (!s.sendAt) return null;
+      return {
+        emailSubmissionId: s.id,
+        emailId: s.emailId,
+        identityId: s.identityId,
+        threadId: s.threadId ?? e?.threadId,
+        sendAt: s.sendAt,
+        undoStatus: s.undoStatus,
+        subject: e?.subject,
+        to: e?.to,
+        from: e?.from,
+        preview: e?.preview,
+      };
+    })
+    .filter((s): s is ScheduledEmail => s !== null)
+    .sort((a, b) => new Date(a.sendAt).getTime() - new Date(b.sendAt).getTime());
+}
+
+// Cancel a pending scheduled send. The held message copy stays in Sent; only
+// delivery is stopped (matches the webmail behaviour).
+export async function cancelScheduledSend(emailSubmissionId: string): Promise<void> {
+  const accountId = jmapClient.accountId;
+  const res = await jmapClient.request(
+    [['EmailSubmission/set', {
+      accountId,
+      update: { [emailSubmissionId]: { undoStatus: 'canceled' } },
+    }, '0']],
+    [CAPABILITIES.CORE, CAPABILITIES.SUBMISSION],
+  );
+  const failure = res.methodResponses[0][1].notUpdated?.[emailSubmissionId] as
+    | { type?: string; description?: string }
+    | undefined;
+  if (failure) {
+    throw new Error(failure.description ?? failure.type ?? 'Failed to cancel scheduled send');
+  }
 }

src/api/files.ts

@@ -1,39 +1,277 @@
 import { jmapClient } from './jmap-client';
 import { CAPABILITIES } from './types';
-import type { FileNode } from './types';
+import type { FileNode, FileNodeRights, Principal } from './types';
+import { getDownloadUrl, uploadBlob } from './blob';
 
-const USING = [CAPABILITIES.CORE, CAPABILITIES.MAIL];
-
-export async function getFileNodes(parentId?: string | null): Promise<FileNode[]> {
-  const accountId = jmapClient.accountId;
-  const filter: Record<string, unknown> = {};
-  if (parentId !== undefined) filter.parentId = parentId;
-
-  const res = await jmapClient.request(
-    [['FileNode/get', { accountId, filter }, '0']],
-    USING,
-  );
-  return res.methodResponses[0][1].list;
+// A FileNode is a folder (container) only when it has no blob content — the
+// server stores it with `file == null`. Sending a blobId/type/size on create
+// (as older builds did: type 'd' + an empty blob) makes a 0-byte FILE that
+// nothing can ever be parented under (#379). The webmail migrates those
+// legacy flat-named nodes into the real parentId hierarchy on load; this app
+// reads and writes only the real hierarchy.
+export function isFolder(node: Pick<FileNode, 'blobId'>): boolean {
+  return node.blobId == null;
 }
 
-export async function createFileNode(
-  fileNode: Partial<FileNode>,
-): Promise<FileNode> {
-  const accountId = jmapClient.accountId;
-  const res = await jmapClient.request(
-    [['FileNode/set', {
-      accountId,
-      create: { 'new-file': fileNode },
-    }, '0']],
-    USING,
+// Stalwart omits shareWith/myRights from FileNode/get unless they are
+// requested explicitly, so the share sheet and indicators must name them here.
+const FILE_NODE_PROPERTIES = [
+  'id', 'parentId', 'name', 'type', 'blobId', 'size', 'created', 'updated',
+  'shareWith', 'myRights',
+];
+
+export function supportsSharing(): boolean {
+  return jmapClient.hasCapability(CAPABILITIES.PRINCIPALS);
+}
+
+function filesAccountId(): string {
+  return (
+    jmapClient.currentSession?.primaryAccounts?.[CAPABILITIES.FILES] ??
+    jmapClient.accountId
   );
-  return res.methodResponses[0][1].created['new-file'];
+}
+
+function fileUsing(): string[] {
+  const using: string[] = [CAPABILITIES.CORE];
+  if (jmapClient.hasCapability(CAPABILITIES.FILES)) {
+    using.push(CAPABILITIES.FILES);
+  }
+  // Required for shareWith/myRights on FileNode and for cross-account
+  // (shared-with-me) FileNode/get.
+  if (supportsSharing()) {
+    using.push(CAPABILITIES.PRINCIPALS_OWNER);
+  }
+  return using;
+}
+
+// Nodes fetched from another principal's account are namespaced
+// "accountId:nodeId" so they can't collide with the primary account's ids.
+// JMAP ids never contain ':', so the separator unambiguously marks a shared
+// (cross-account) node.
+export function isCrossAccountId(id: string | null | undefined): boolean {
+  return id != null && id.includes(':');
+}
+
+// Fetch every FileNode in the account, files AND folders, to build the
+// hierarchy client-side from parentId links.
+//
+// IMPORTANT: this uses FileNode/get with ids:null (return-all), NOT
+// FileNode/query — Stalwart's query only returns leaf files and omits folder
+// nodes entirely, which would make every folder invisible.
+export async function getAllFileNodes(): Promise<FileNode[]> {
+  const accountId = filesAccountId();
+  const res = await jmapClient.request(
+    [['FileNode/get', { accountId, ids: null, properties: FILE_NODE_PROPERTIES }, '0']],
+    fileUsing(),
+  );
+  const result = res.methodResponses[0];
+  if (!result || result[0] === 'error') {
+    throw new Error(result?.[1]?.description || 'FileNode list failed');
+  }
+  return (result[1].list ?? []) as FileNode[];
+}
+
+// Accounts (primary + shared/group) that can hold FileNodes: any non-primary
+// account that advertises the filenode capability or is non-personal, since
+// Stalwart doesn't always advertise capabilities on shared accounts.
+function filesCapableAccountIds(): string[] {
+  const primaryId = filesAccountId();
+  const accounts = jmapClient.currentSession?.accounts ?? {};
+  const rest = Object.entries(accounts)
+    .filter(([id, info]) =>
+      id !== primaryId &&
+      (info.accountCapabilities?.[CAPABILITIES.FILES] != null || !info.isPersonal))
+    .map(([id]) => id);
+  return [primaryId, ...rest];
+}
+
+// Fetch every FileNode the logged-in user can see across all accessible
+// accounts. Nodes owned by another principal (shared with the user) are
+// tagged `isShared: true` with the owning accountId/accountName, and their
+// ids/parentIds are namespaced "accountId:nodeId". Mirrors the webmail's
+// listAllFileNodesAcrossAccounts.
+export async function getAllFileNodesAcrossAccounts(): Promise<FileNode[]> {
+  const primaryId = filesAccountId();
+  const accounts = jmapClient.currentSession?.accounts ?? {};
+  const all: FileNode[] = [];
+
+  for (const accountId of filesCapableAccountIds()) {
+    const isPrimary = accountId === primaryId;
+    try {
+      const res = await jmapClient.request(
+        [['FileNode/get', { accountId, ids: null, properties: FILE_NODE_PROPERTIES }, '0']],
+        fileUsing(),
+      );
+      const result = res.methodResponses[0];
+      if (!result || result[0] === 'error') continue;
+      for (const node of (result[1].list ?? []) as FileNode[]) {
+        all.push({
+          ...node,
+          id: isPrimary ? node.id : `${accountId}:${node.id}`,
+          parentId: node.parentId == null
+            ? null
+            : (isPrimary ? node.parentId : `${accountId}:${node.parentId}`),
+          accountId,
+          accountName: accounts[accountId]?.name || accountId,
+          isShared: !isPrimary,
+        });
+      }
+    } catch {
+      // A single unreachable shared account shouldn't hide the user's own
+      // files; skip it and keep aggregating.
+    }
+  }
+
+  return all;
+}
+
+export async function createFolder(
+  name: string,
+  parentId: string | null,
+): Promise<FileNode> {
+  const accountId = filesAccountId();
+  const props: Record<string, unknown> = { name };
+  if (parentId !== null) props.parentId = parentId;
+
+  const res = await jmapClient.request(
+    [['FileNode/set', { accountId, create: { 'new-dir': props } }, '0']],
+    fileUsing(),
+  );
+  const result = res.methodResponses[0][1];
+  const created = result.created?.['new-dir'];
+  if (!created) {
+    const err = result.notCreated?.['new-dir'];
+    throw new Error(err?.description || 'Create folder failed');
+  }
+  return { ...props, ...created } as FileNode;
+}
+
+export async function updateFileNode(
+  id: string,
+  updates: Partial<Pick<FileNode, 'name' | 'parentId'>>,
+): Promise<void> {
+  const accountId = filesAccountId();
+  const res = await jmapClient.request(
+    [['FileNode/set', { accountId, update: { [id]: updates } }, '0']],
+    fileUsing(),
+  );
+  const notUpdated = res.methodResponses[0][1].notUpdated?.[id];
+  if (notUpdated) throw new Error(notUpdated.description || 'Update failed');
+}
+
+export async function renameFileNode(id: string, newName: string): Promise<void> {
+  await updateFileNode(id, { name: newName });
 }
 
 export async function deleteFileNodes(ids: string[]): Promise<void> {
-  const accountId = jmapClient.accountId;
-  await jmapClient.request(
-    [['FileNode/set', { accountId, destroy: ids }, '0']],
-    USING,
+  if (ids.length === 0) return;
+  const accountId = filesAccountId();
+  const res = await jmapClient.request(
+    [['FileNode/set', {
+      accountId,
+      destroy: ids,
+      // The server removes descendant nodes of destroyed folders.
+      onDestroyRemoveChildren: true,
+    }, '0']],
+    fileUsing(),
   );
+  const notDestroyed = res.methodResponses[0][1].notDestroyed as
+    | Record<string, { description?: string }>
+    | undefined;
+  const failedIds = Object.keys(notDestroyed ?? {});
+  if (failedIds.length > 0) {
+    throw new Error(
+      notDestroyed![failedIds[0]]?.description || `Failed to delete ${failedIds.length} item(s)`,
+    );
+  }
+}
+
+export function getFileNodeDownloadUrl(node: FileNode): string {
+  if (!node.blobId) throw new Error('Folders cannot be downloaded');
+  return getDownloadUrl(node.blobId, node.name, node.type, node.accountId);
+}
+
+export async function uploadFileNode(
+  uri: string,
+  name: string,
+  mimeType: string,
+  parentId: string | null,
+): Promise<FileNode> {
+  const accountId = filesAccountId();
+  const blob = await uploadBlob(uri, mimeType);
+  const type = blob.type || mimeType || 'application/octet-stream';
+  const props: Record<string, unknown> = {
+    name,
+    // Stalwart caps the stored MIME type; very long types fail the create.
+    type: type.length > 30 ? 'application/octet-stream' : type,
+    blobId: blob.blobId,
+    size: blob.size,
+  };
+  if (parentId !== null) props.parentId = parentId;
+
+  const res = await jmapClient.request(
+    [['FileNode/set', { accountId, create: { 'new-file': props } }, '0']],
+    fileUsing(),
+  );
+  const result = res.methodResponses[0][1];
+  const created = result.created?.['new-file'];
+  if (!created) {
+    const err = result.notCreated?.['new-file'];
+    throw new Error(err?.description || 'Upload failed');
+  }
+  return { ...props, ...created } as FileNode;
+}
+
+// ── Sharing (RFC 9670) ────────────────────────────────────
+
+// Add, update, or remove a principal's rights on an owned FileNode (file or
+// folder). Pass rights: null to revoke. Stalwart applies it via a
+// `shareWith/{principalId}` patch on FileNode/set. Sharing a folder shares
+// its whole subtree — which is why this app must store real parentId
+// hierarchy rather than the legacy flat-name encoding.
+export async function setFileNodeShare(
+  fileNodeId: string,
+  principalId: string,
+  rights: FileNodeRights | null,
+): Promise<void> {
+  const accountId = filesAccountId();
+  const res = await jmapClient.request(
+    [['FileNode/set', {
+      accountId,
+      update: { [fileNodeId]: { [`shareWith/${principalId}`]: rights } },
+    }, '0']],
+    fileUsing(),
+  );
+  const result = res.methodResponses[0][1];
+  if (result.notUpdated?.[fileNodeId]) {
+    throw new Error(result.notUpdated[fileNodeId].description || 'Failed to update file share');
+  }
+  if (!result.updated || !(fileNodeId in result.updated)) {
+    throw new Error('Server did not confirm the share update');
+  }
+}
+
+// List all principals visible to the user. Stalwart returns the full
+// directory regardless of `filter`, so callers filter client-side.
+export async function getPrincipals(): Promise<Principal[]> {
+  if (!supportsSharing()) return [];
+  const accountId = jmapClient.accountId;
+  const res = await jmapClient.request(
+    [
+      ['Principal/query', { accountId }, '0'],
+      ['Principal/get', {
+        accountId,
+        '#ids': { resultOf: '0', name: 'Principal/query', path: '/ids' },
+      }, '1'],
+    ],
+    [CAPABILITIES.CORE, CAPABILITIES.PRINCIPALS],
+  );
+  const getResp = res.methodResponses.find((r) => r[0] === 'Principal/get');
+  return (getResp?.[1].list ?? []) as Principal[];
+}
+
+// The principal id that represents the logged-in user (excluded from the
+// share picker — sharing with yourself is a no-op the server may reject).
+export function ownPrincipalId(): string {
+  return filesAccountId();
 }

src/api/jmap-client.ts

@@ -8,6 +8,11 @@ import type {
 import { CAPABILITIES } from './types';
 import { generateAccountId } from '../lib/account-utils';
 import { secureFetch } from '../lib/client-cert';
+import { refreshOAuthAccessToken, type OAuthTokens } from '../lib/oauth';
+
+// Refresh OAuth access tokens this many ms before they actually expire so
+// in-flight requests don't race the expiry window.
+const TOKEN_REFRESH_LEEWAY_MS = 60_000;
 
 const LEGACY_CREDENTIALS_KEY = 'jmap_credentials';
 const CREDENTIALS_PREFIX = 'jmap_credentials__';
@@ -22,6 +27,13 @@ export interface StoredCredentials {
   username: string;
   password: string;
   accessToken?: string;
+  // OAuth-only — present when credentials came in via the webmail handoff
+  // OAuth path rather than password auth. The token endpoint and client id
+  // are needed for refresh; without them the access token would just expire.
+  refreshToken?: string;
+  expiresAt?: number;
+  tokenEndpoint?: string;
+  clientId?: string;
 }
 
 export class JMAPClient {
@@ -48,6 +60,13 @@ export class JMAPClient {
     return this.credentials?.serverUrl ?? null;
   }
 
+  // True when the session authenticates with a Bearer token (OAuth handoff or
+  // token login) rather than a username/password. Used by the security screen
+  // to hide password/TOTP management, which only applies to password accounts.
+  get usesBearerAuth(): boolean {
+    return !!this.credentials?.accessToken;
+  }
+
   get isConnected(): boolean {
     return this.session !== null && this._accountId !== null;
   }
@@ -93,6 +112,113 @@ export class JMAPClient {
     return this.session;
   }
 
+  // OAuth login via webmail handoff. The webmail did the OAuth dance against
+  // Stalwart and handed us a complete token bundle. We persist the bundle
+  // so subsequent launches can refresh without prompting the user again.
+  async connectWithOAuth(
+    serverUrl: string,
+    tokens: OAuthTokens,
+  ): Promise<{ session: JMAPSession; username: string; accountId: string }> {
+    const baseUrl = serverUrl.replace(/\/+$/, '');
+    this.credentials = {
+      serverUrl: baseUrl,
+      username: '',
+      password: '',
+      accessToken: tokens.accessToken,
+      refreshToken: tokens.refreshToken,
+      expiresAt: tokens.expiresAt,
+      tokenEndpoint: tokens.tokenEndpoint,
+      clientId: tokens.clientId,
+    };
+
+    this.session = this.rewriteSessionUrls(await this.fetchSession(baseUrl), baseUrl);
+    this._accountId = this.resolveAccountId(this.session);
+
+    // The JMAP session document carries the authenticated user's identifier
+    // — use it as the username so per-account storage keys are stable across
+    // restarts and OAuth re-logins.
+    const username = this.session.username || tokens.accessToken.slice(0, 8);
+    this.credentials.username = username;
+
+    const accountId = generateAccountId(username, baseUrl);
+    await SecureStore.setItemAsync(
+      credentialsKey(accountId),
+      JSON.stringify(this.credentials),
+    );
+
+    return { session: this.session, username, accountId };
+  }
+
+  private async persistRefreshedTokens(next: OAuthTokens): Promise<void> {
+    if (!this.credentials) return;
+    this.credentials = {
+      ...this.credentials,
+      accessToken: next.accessToken,
+      // Some IdPs rotate refresh tokens; others reuse. Fall back to the
+      // existing one when the response omits it.
+      refreshToken: next.refreshToken ?? this.credentials.refreshToken,
+      expiresAt: next.expiresAt,
+      tokenEndpoint: next.tokenEndpoint,
+      clientId: next.clientId,
+    };
+    const accountId = generateAccountId(
+      this.credentials.username,
+      this.credentials.serverUrl,
+    );
+    await SecureStore.setItemAsync(
+      credentialsKey(accountId),
+      JSON.stringify(this.credentials),
+    );
+  }
+
+  private currentOAuthTokens(): OAuthTokens | null {
+    if (
+      !this.credentials?.accessToken ||
+      !this.credentials.refreshToken ||
+      !this.credentials.tokenEndpoint ||
+      !this.credentials.clientId
+    ) {
+      return null;
+    }
+    return {
+      accessToken: this.credentials.accessToken,
+      refreshToken: this.credentials.refreshToken,
+      expiresAt: this.credentials.expiresAt,
+      tokenEndpoint: this.credentials.tokenEndpoint,
+      clientId: this.credentials.clientId,
+    };
+  }
+
+  // Proactive refresh: when the access token is about to expire, swap it for
+  // a fresh one. Quiet no-op for password credentials.
+  private async ensureFreshToken(): Promise<void> {
+    const tokens = this.currentOAuthTokens();
+    if (!tokens) return;
+    if (tokens.expiresAt == null) return;
+    if (tokens.expiresAt - Date.now() > TOKEN_REFRESH_LEEWAY_MS) return;
+    try {
+      const next = await refreshOAuthAccessToken(tokens);
+      await this.persistRefreshedTokens(next);
+    } catch {
+      // Surface as AuthenticationError on the next 401; refresh may be
+      // temporarily failing (network) and the reactive retry path catches it.
+    }
+  }
+
+  // Reactive refresh after a 401. Returns true if a fresh token was obtained
+  // so the caller can retry the original request.
+  private async forceRefreshToken(): Promise<boolean> {
+    const tokens = this.currentOAuthTokens();
+    if (!tokens) return false;
+    try {
+      const next = await refreshOAuthAccessToken(tokens);
+      await this.persistRefreshedTokens(next);
+      return true;
+    } catch {
+      return false;
+    }
+  }
+
   // Legacy single-slot restore - kept for backward-compat tests. New code
   // should use loadAccount(accountId) driven by the account registry.
   async restoreSession(): Promise<boolean> {
@@ -235,12 +361,18 @@ export class JMAPClient {
 
   private async fetchSession(baseUrl: string): Promise<JMAPSession> {
     const url = `${baseUrl}/.well-known/jmap`;
-    const response = await secureFetch(url, {
-      headers: {
-        Authorization: this.authHeader,
-        Accept: 'application/json',
-      },
-    });
+    await this.ensureFreshToken();
+    const doFetch = () =>
+      secureFetch(url, {
+        headers: {
+          Authorization: this.authHeader,
+          Accept: 'application/json',
+        },
+      });
+    let response = await doFetch();
+    if (response.status === 401 && (await this.forceRefreshToken())) {
+      response = await doFetch();
+    }
 
     if (response.status === 401) {
       throw new AuthenticationError('Invalid credentials');
@@ -280,14 +412,21 @@ export class JMAPClient {
       methodCalls,
     };
 
-    const response = await secureFetch(this.session.apiUrl, {
-      method: 'POST',
-      headers: {
-        'Content-Type': 'application/json',
-        Authorization: this.authHeader,
-      },
-      body: JSON.stringify(body),
-    });
+    await this.ensureFreshToken();
+    const doFetch = () =>
+      secureFetch(this.session!.apiUrl, {
+        method: 'POST',
+        headers: {
+          'Content-Type': 'application/json',
+          Authorization: this.authHeader,
+        },
+        body: JSON.stringify(body),
+      });
+
+    let response = await doFetch();
+    if (response.status === 401 && (await this.forceRefreshToken())) {
+      response = await doFetch();
+    }
 
     if (response.status === 401) {
       throw new AuthenticationError('Session expired');
@@ -319,6 +458,59 @@ export class JMAPClient {
     return core?.maxObjectsInGet || 500;
   }
 
+  // ── Scheduled send (FUTURERELEASE) ────────────────────
+  // The JMAP submission capability advertises `maxDelayedSend` (max hold in
+  // seconds) and a `submissionExtensions` map; FUTURERELEASE support is what
+  // lets us defer delivery via the SMTP HOLDFOR parameter. Mirrors the webmail
+  // implementation so behaviour stays in sync across platforms.
+
+  private get submissionCapability():
+    | { maxDelayedSend?: number; submissionExtensions?: unknown }
+    | undefined {
+    return this.session?.capabilities?.[CAPABILITIES.SUBMISSION] as
+      | { maxDelayedSend?: number; submissionExtensions?: unknown }
+      | undefined;
+  }
+
+  getMaxDelayedSend(): number {
+    const max = this.submissionCapability?.maxDelayedSend;
+    return typeof max === 'number' ? max : 0;
+  }
+
+  hasDelayedSend(): boolean {
+    const cap = this.submissionCapability;
+    if (!cap) return false;
+    const ext = cap.submissionExtensions;
+    // submissionExtensions is a map of extension name → params. FUTURERELEASE
+    // (RFC 4865) is the SMTP extension that backs deferred delivery.
+    const hasFutureRelease =
+      !!ext &&
+      typeof ext === 'object' &&
+      Object.keys(ext as Record<string, unknown>).some(
+        (k) => k.toUpperCase() === 'FUTURERELEASE',
+      );
+    return hasFutureRelease && this.getMaxDelayedSend() > 0;
+  }
+
+  // ── Stored credentials (per-account) ──────────────────
+  // Exposed so the unified-inbox aggregator can read another account's
+  // credentials without disturbing this client's live session, and persist a
+  // refreshed OAuth token back to secure storage.
+
+  async getStoredCredentials(accountId: string): Promise<StoredCredentials | null> {
+    const stored = await SecureStore.getItemAsync(credentialsKey(accountId));
+    if (!stored) return null;
+    try {
+      return JSON.parse(stored) as StoredCredentials;
+    } catch {
+      return null;
+    }
+  }
+
+  async setStoredCredentials(accountId: string, creds: StoredCredentials): Promise<void> {
+    await SecureStore.setItemAsync(credentialsKey(accountId), JSON.stringify(creds));
+  }
+
   // ── Blob Download ─────────────────────────────────────
 
   // Expand the RFC 6570 level-1 template the JMAP server advertises.
@@ -335,9 +527,12 @@ export class JMAPClient {
 
   async fetchBlobArrayBuffer(blobId: string, name?: string, type?: string): Promise<ArrayBuffer> {
     const url = this.getBlobDownloadUrl(blobId, name, type);
-    const response = await secureFetch(url, {
-      headers: { Authorization: this.authHeader },
-    });
+    await this.ensureFreshToken();
+    const doFetch = () => secureFetch(url, { headers: { Authorization: this.authHeader } });
+    let response = await doFetch();
+    if (response.status === 401 && (await this.forceRefreshToken())) {
+      response = await doFetch();
+    }
     if (response.status === 401) throw new AuthenticationError('Session expired');
     if (!response.ok) throw new Error(`Failed to fetch blob: ${response.status}`);
     return response.arrayBuffer();

src/api/push.ts

@@ -201,13 +201,35 @@ export function startPolling(
   return () => clearInterval(timer);
 }
 
+export interface StartPushOptions {
+  onStateChange: StateChangeHandler;
+  onError?: (error: Error) => void;
+}
+
 /**
- * Start real-time updates, preferring SSE with polling fallback.
+ * Start real-time updates, preferring SSE with polling fallback. The `_client`
+ * argument is unused today (the underlying event source uses the singleton
+ * `jmapClient`) but is part of the call signature so the host App can pass
+ * the active client reference and trigger React re-runs on account switch.
  */
 export function startPushUpdates(
-  onStateChange: StateChangeHandler,
+  _client: unknown,
+  opts: StartPushOptions,
 ): () => void {
-  const cleanup = connectEventSource(onStateChange);
-  if (cleanup) return cleanup;
-  return startPolling(onStateChange);
+  const onError = opts.onError;
+  const safeOnStateChange: StateChangeHandler = (change) => {
+    try {
+      opts.onStateChange(change);
+    } catch (err) {
+      if (onError) onError(err instanceof Error ? err : new Error(String(err)));
+    }
+  };
+  try {
+    const cleanup = connectEventSource(safeOnStateChange);
+    if (cleanup) return cleanup;
+    return startPolling(safeOnStateChange);
+  } catch (err) {
+    if (onError) onError(err instanceof Error ? err : new Error(String(err)));
+    return () => undefined;
+  }
 }

src/api/sieve.ts

@@ -0,0 +1,194 @@
+import { jmapClient } from './jmap-client';
+import { CAPABILITIES } from './types';
+import { secureFetch } from '../lib/client-cert';
+import type { SieveScript, SieveCapabilities } from '../lib/sieve/types';
+
+// JMAP Sieve (RFC 9661) bindings. Mirrors the webmail JMAPClient Sieve methods
+// but follows the mobile convention of a functional api/* module driving the
+// shared `jmapClient` singleton (see api/vacation.ts, api/blob.ts).
+
+const SIEVE_USING = [CAPABILITIES.CORE, CAPABILITIES.SIEVE];
+
+function requireSession() {
+  const session = jmapClient.currentSession;
+  if (!session) throw new Error('Not connected');
+  return session;
+}
+
+// Sieve lives on its own JMAP account (RFC 9661). Fall back to the mail account
+// when the server does not advertise a dedicated one (Stalwart uses the same id).
+export function getSieveAccountId(): string {
+  const session = jmapClient.currentSession;
+  return session?.primaryAccounts?.[CAPABILITIES.SIEVE] ?? jmapClient.accountId;
+}
+
+export function isSieveSupported(): boolean {
+  const session = jmapClient.currentSession;
+  if (!session) return false;
+  return CAPABILITIES.SIEVE in (session.capabilities ?? {});
+}
+
+export function getSieveCapabilities(): SieveCapabilities | null {
+  const session = jmapClient.currentSession;
+  if (!session) return null;
+  const info = session.accounts?.[getSieveAccountId()];
+  const caps = info?.accountCapabilities?.[CAPABILITIES.SIEVE];
+  return (caps as SieveCapabilities) ?? null;
+}
+
+export async function getSieveScripts(): Promise<SieveScript[]> {
+  const res = await jmapClient.request(
+    [['SieveScript/get', { accountId: getSieveAccountId() }, '0']],
+    SIEVE_USING,
+  );
+  const resp = res.methodResponses?.[0];
+  if (resp && resp[0] === 'SieveScript/get') {
+    return ((resp[1] as { list?: SieveScript[] }).list ?? []) as SieveScript[];
+  }
+  throw new Error('Failed to fetch Sieve scripts');
+}
+
+export async function getSieveScriptContent(blobId: string): Promise<string> {
+  const session = requireSession();
+  const url = session.downloadUrl
+    .replace('{accountId}', encodeURIComponent(getSieveAccountId()))
+    .replace('{blobId}', encodeURIComponent(blobId))
+    .replace('{name}', encodeURIComponent('script.sieve'))
+    .replace('{type}', encodeURIComponent('application/sieve'));
+
+  const response = await secureFetch(url, {
+    headers: { Authorization: jmapClient.authHeader },
+  });
+  if (!response.ok) throw new Error(`Failed to download script: ${response.status}`);
+  return response.text();
+}
+
+async function uploadSieveBlob(content: string): Promise<string> {
+  const session = requireSession();
+  const uploadUrl = session.uploadUrl.replace(
+    '{accountId}',
+    encodeURIComponent(getSieveAccountId()),
+  );
+
+  const response = await secureFetch(uploadUrl, {
+    method: 'POST',
+    headers: {
+      'Content-Type': 'application/sieve',
+      Authorization: jmapClient.authHeader,
+    },
+    // A plain string body is encoded as UTF-8 by RN's fetch. (api/blob.ts uses
+    // an ArrayBuffer only because typed-array bodies get stringified there.)
+    body: content,
+  });
+
+  if (!response.ok) {
+    const detail = await response.text().catch(() => '');
+    throw new Error(`Failed to upload Sieve script: ${response.status}${detail ? ` ${detail.substring(0, 200)}` : ''}`);
+  }
+
+  const raw = (await response.json()) as Record<string, unknown>;
+  const direct = raw as { blobId?: string };
+  if (typeof direct.blobId === 'string') return direct.blobId;
+  const nested = raw[getSieveAccountId()] as { blobId?: string } | undefined;
+  if (nested?.blobId) return nested.blobId;
+  throw new Error('Upload succeeded but response did not include a blobId');
+}
+
+export async function createSieveScript(
+  name: string,
+  content: string,
+  activate = true,
+): Promise<SieveScript> {
+  const blobId = await uploadSieveBlob(content);
+  const accountId = getSieveAccountId();
+
+  const setArgs: Record<string, unknown> = {
+    accountId,
+    create: { 'new-script': { name, blobId } },
+  };
+  if (activate) setArgs.onSuccessActivateScript = '#new-script';
+
+  const res = await jmapClient.request([['SieveScript/set', setArgs, '0']], SIEVE_USING);
+  const resp = res.methodResponses?.[0];
+  if (resp && resp[0] === 'SieveScript/set') {
+    const result = resp[1] as {
+      notCreated?: Record<string, { description?: string }>;
+      created?: Record<string, { id?: string }>;
+    };
+    if (result.notCreated?.['new-script']) {
+      throw new Error(result.notCreated['new-script'].description ?? 'Failed to create Sieve script');
+    }
+    const createdId = result.created?.['new-script']?.id;
+    if (createdId) {
+      const scripts = await getSieveScripts();
+      const script = scripts.find((s) => s.id === createdId);
+      if (script) return script;
+    }
+  }
+  throw new Error('Failed to create Sieve script');
+}
+
+export async function updateSieveScript(
+  scriptId: string,
+  content: string,
+  activate = true,
+): Promise<void> {
+  const blobId = await uploadSieveBlob(content);
+  const accountId = getSieveAccountId();
+
+  const setArgs: Record<string, unknown> = {
+    accountId,
+    update: { [scriptId]: { blobId } },
+  };
+  if (activate) setArgs.onSuccessActivateScript = scriptId;
+
+  const res = await jmapClient.request([['SieveScript/set', setArgs, '0']], SIEVE_USING);
+  const resp = res.methodResponses?.[0];
+  if (resp && resp[0] === 'SieveScript/set') {
+    const result = resp[1] as { notUpdated?: Record<string, { description?: string }> };
+    if (result.notUpdated?.[scriptId]) {
+      throw new Error(result.notUpdated[scriptId].description ?? 'Failed to update Sieve script');
+    }
+    return;
+  }
+  throw new Error('Failed to update Sieve script');
+}
+
+export async function deleteSieveScript(scriptId: string): Promise<void> {
+  const res = await jmapClient.request(
+    [['SieveScript/set', { accountId: getSieveAccountId(), destroy: [scriptId] }, '0']],
+    SIEVE_USING,
+  );
+  const resp = res.methodResponses?.[0];
+  if (resp && resp[0] === 'SieveScript/set') {
+    const result = resp[1] as { notDestroyed?: Record<string, { description?: string }> };
+    if (result.notDestroyed?.[scriptId]) {
+      throw new Error(result.notDestroyed[scriptId].description ?? 'Failed to delete Sieve script');
+    }
+    return;
+  }
+  throw new Error('Failed to delete Sieve script');
+}
+
+export async function validateSieveScript(
+  content: string,
+): Promise<{ isValid: boolean; errors?: string[] }> {
+  const blobId = await uploadSieveBlob(content);
+  const res = await jmapClient.request(
+    [['SieveScript/validate', { accountId: getSieveAccountId(), blobId }, '0']],
+    SIEVE_USING,
+  );
+  const resp = res.methodResponses?.[0];
+  if (resp && resp[0] === 'SieveScript/validate') {
+    const result = resp[1] as { error?: { description?: string } };
+    if (result.error) {
+      return { isValid: false, errors: [result.error.description ?? 'Validation failed'] };
+    }
+    return { isValid: true };
+  }
+  if (resp && typeof resp[0] === 'string' && resp[0].endsWith('error')) {
+    const error = resp[1] as { description?: string };
+    return { isValid: false, errors: [error.description ?? 'Validation failed'] };
+  }
+  return { isValid: false, errors: ['Unexpected validation response'] };
+}

src/api/types.ts

@@ -9,12 +9,19 @@ export interface JMAPSession {
   accounts: Record<string, JMAPAccountInfo>;
   capabilities: Record<string, unknown>;
   state: string;
+  // RFC 8620 §2 — authenticated user identifier. Optional because not all
+  // servers populate it; OAuth login uses it as the account label when
+  // there's no password username to fall back on.
+  username?: string;
 }
 
 export interface JMAPAccountInfo {
   name: string;
   isPersonal: boolean;
   isReadOnly: boolean;
+  // Per-account capability objects (RFC 8620 §2). Optional because not every
+  // server populates it; the Sieve panel reads its limits/extensions from here.
+  accountCapabilities?: Record<string, unknown>;
 }
 
 export type JMAPMethodCall = [string, Record<string, unknown>, string];
@@ -284,6 +291,13 @@ export interface ContactCryptoKey {
   contexts?: Record<string, boolean>;
 }
 
+export interface ContactDirectory {
+  uri: string;
+  kind?: 'directory' | 'entry' | string;
+  mediaType?: string;
+  pref?: number;
+}
+
 export interface ContactPronouns {
   pronouns: string;
   pref?: number;
@@ -318,12 +332,15 @@ export interface ContactCard {
   relatedTo?: Record<string, ContactRelation>;
   links?: Record<string, ContactLink>;
   cryptoKeys?: Record<string, ContactCryptoKey>;
+  directories?: Record<string, ContactDirectory>;
   keywords?: Record<string, boolean>;
   members?: Record<string, boolean>;
   speakToAs?: ContactSpeakToAs;
   calendarUri?: string;
   schedulingUri?: string;
   freeBusyUri?: string;
+  source?: string;
+  prodId?: string;
   created?: string;
   updated?: string;
 }
@@ -352,16 +369,43 @@ export interface AddressBookWithCount extends AddressBook {
 // ─── Calendar (RFC 8984 JSCalendar) ─────────────────────
 
 export interface Participant {
+  '@type'?: 'Participant';
   name?: string;
   email?: string;
   sendTo?: Record<string, string>;
+  // Stalwart uses calendarAddress (a `mailto:` URI) instead of email/sendTo.
+  calendarAddress?: string;
   kind?: string;
   roles?: Record<string, boolean>;
-  participationStatus?: string;
+  participationStatus?: 'needs-action' | 'accepted' | 'declined' | 'tentative' | 'delegated' | string;
+  participationComment?: string;
+  scheduleStatus?: string[];
   expectReply?: boolean;
+  description?: string;
+}
+
+// JSCalendar Location (RFC 8984 §4.2.5) — a physical place.
+export interface EventLocation {
+  '@type'?: 'Location';
+  name?: string;
+  description?: string;
+  locationTypes?: Record<string, boolean>;
+  relativeTo?: string;
+  timeZone?: string;
+  coordinates?: string;
+}
+
+// JSCalendar VirtualLocation (RFC 8984 §4.2.6) — a video/online place.
+export interface VirtualLocation {
+  '@type'?: 'VirtualLocation';
+  name?: string;
+  description?: string;
+  uri: string;
+  features?: Record<string, boolean>;
 }
 
 export interface RecurrenceRule {
+  '@type'?: 'RecurrenceRule';
   frequency: string;
   interval?: number;
   until?: string;
@@ -376,6 +420,8 @@ export interface RecurrenceRule {
   bySecond?: number[];
   bySetPosition?: number[];
   firstDayOfWeek?: string;
+  rscale?: string;
+  skip?: string;
 }
 
 export interface Alert {
@@ -399,27 +445,80 @@ export interface CalendarEvent {
   status?: string;
   freeBusyStatus?: string;
   participants?: Record<string, Participant>;
+  // Scheduling (iTIP/iMIP). `replyTo` tells the server where RSVP replies go;
+  // Stalwart additionally exposes the organizer as `organizerCalendarAddress`.
+  replyTo?: Record<string, string>;
+  organizerCalendarAddress?: string;
+  sequence?: number;
   recurrenceRules?: RecurrenceRule[];
   recurrenceOverrides?: Record<string, Partial<CalendarEvent>>;
   excludedRecurrenceRules?: RecurrenceRule[];
   recurrenceId?: string;
   originalId?: string;
+  // Client-only: the event's server-side calendarIds (raw, unprefixed), kept
+  // when `calendarIds` is remapped to namespaced store ids for shared events.
+  originalCalendarIds?: Record<string, boolean>;
+  useDefaultAlerts?: boolean;
   alerts?: Record<string, Alert>;
+  locations?: Record<string, EventLocation>;
+  virtualLocations?: Record<string, VirtualLocation>;
   links?: Record<string, { href: string; rel?: string }>;
   created?: string;
   updated?: string;
-  progress?: string;
+  // Task-only (RFC 8984 JSTask) fields.
+  progress?: 'needs-action' | 'in-process' | 'completed' | 'failed' | 'cancelled' | string;
   due?: string;
+  priority?: number;
+  percentComplete?: number;
   color?: string;
+  // Client-only: account the event/occurrence belongs to (for shared/virtual).
+  localAccountId?: string;
+  // Client-only: JMAP account the event was fetched from. Absent for the
+  // primary account; set for events on calendars shared with the user so
+  // mutations can be routed to the owning account.
+  accountId?: string;
+  // Client-only: true when the event lives on a calendar shared with the user.
+  isShared?: boolean;
+}
+
+export interface CalendarRights {
+  mayReadFreeBusy?: boolean;
+  mayReadItems?: boolean;
+  mayWriteAll?: boolean;
+  mayWriteOwn?: boolean;
+  mayUpdatePrivate?: boolean;
+  mayRSVP?: boolean;
+  mayShare?: boolean;
+  mayDelete?: boolean;
+  // Legacy short flag still read by the sidebar drawer.
+  mayWrite?: boolean;
 }
 
 export interface Calendar {
   id: string;
   name: string;
+  description?: string | null;
   color?: string;
   isVisible?: boolean;
+  isSubscribed?: boolean;
+  isDefault?: boolean;
   sortOrder?: number;
-  myRights?: Record<string, boolean>;
+  myRights?: CalendarRights;
+  // Client-only: JMAP account the calendar was fetched from. Absent for the
+  // primary account; set for calendars shared with the user.
+  accountId?: string;
+  // Client-only: the real JMAP id of a shared calendar, before its `id` was
+  // namespaced as `${accountId}:${id}` to stay unique in the store. Mutations
+  // and event queries must use this raw id against the owning account.
+  originalId?: string;
+  // Client-only: true when the calendar lives in another account (shared
+  // with the user by its owner).
+  isShared?: boolean;
+  // Client-only: set when `color` has been replaced by the viewer's local
+  // override for a shared calendar (see lib/calendar-utils). When true, the
+  // override wins over per-event colors so the whole shared calendar paints
+  // uniformly.
+  colorIsLocalOverride?: boolean;
 }
 
 // ─── Files (FileNode) ───────────────────────────────────
@@ -429,10 +528,44 @@ export interface FileNode {
   name: string;
   parentId?: string | null;
   type: string;
-  blobId?: string;
+  blobId?: string | null;
   size?: number;
   created?: string;
   updated?: string;
+  // JMAP Sharing (RFC 9670). Populated only when the server advertises the
+  // principals capability and the properties are requested explicitly. A node
+  // is shared-out when `shareWith` has entries; `myRights` describes what the
+  // viewer may do (always full rights on owned nodes).
+  myRights?: FileNodeRights;
+  shareWith?: Record<string, FileNodeRights> | null;
+  // True when this node was fetched from another principal's account that was
+  // shared with the logged-in user ("Shared with me").
+  isShared?: boolean;
+  // Owning account's JMAP id and display name, set when aggregating nodes
+  // across accounts so blob downloads route to the right account.
+  accountId?: string;
+  accountName?: string;
+}
+
+// FileNode rights as defined by Stalwart's JmapSharedObject implementation.
+export interface FileNodeRights {
+  mayRead: boolean;
+  mayAddChildren: boolean;
+  mayRename: boolean;
+  mayDelete: boolean;
+  mayModifyContent: boolean;
+  mayShare: boolean;
+}
+
+// RFC 9670 principal — an entity (user, group, resource) that files and
+// calendars can be shared with. On Stalwart the principal id doubles as the
+// account id of that user/group.
+export interface Principal {
+  id: string;
+  type: 'individual' | 'group' | 'resource' | 'location' | 'other';
+  name: string;
+  description?: string | null;
+  email?: string | null;
 }
 
 // ─── Push / SSE ─────────────────────────────────────────
@@ -465,4 +598,7 @@ export const CAPABILITIES = {
   CALENDARS: 'urn:ietf:params:jmap:calendars',
   SIEVE: 'urn:ietf:params:jmap:sieve',
   QUOTA: 'urn:ietf:params:jmap:quota',
+  FILES: 'urn:ietf:params:jmap:filenode',
+  PRINCIPALS: 'urn:ietf:params:jmap:principals',
+  PRINCIPALS_OWNER: 'urn:ietf:params:jmap:principals:owner',
 } as const;

src/api/unified-inbox.ts

@@ -0,0 +1,254 @@
+import { CAPABILITIES } from './types';
+import type { Email, JMAPSession, JMAPMethodCall, Mailbox } from './types';
+import { jmapClient, type StoredCredentials } from './jmap-client';
+import { secureFetch } from '../lib/client-cert';
+import { refreshOAuthAccessToken, type OAuthTokens } from '../lib/oauth';
+
+// Aggregated inbox across every logged-in account. Because the JMAP client is
+// a single-account singleton (one live session at a time), we fetch each
+// account's inbox "detached" here — reading its stored credentials directly and
+// issuing requests against its own API URL — so the active account's live
+// session is never disturbed.
+
+const EMAIL_LIST_PROPERTIES = [
+  'id', 'threadId', 'mailboxIds', 'keywords', 'size',
+  'receivedAt', 'from', 'to', 'subject', 'preview', 'hasAttachment',
+];
+
+const TOKEN_REFRESH_LEEWAY_MS = 60_000;
+
+export interface UnifiedEmail extends Email {
+  /** Registry account id this message belongs to (not the JMAP account id). */
+  sourceAccountId: string;
+  /**
+   * JMAP account id the message lives under. Equals the registry account's
+   * primary JMAP account for own mail, or a group/shared owner account when
+   * the message came from a group inbox. Carried so opening can target the
+   * right account via an Email/get override.
+   */
+  jmapAccountId: string;
+  /** True when this message belongs to a group/shared inbox, not the user's own. */
+  isShared: boolean;
+  /** Human label for the owning account when shared (e.g. "Support"). */
+  sharedLabel?: string;
+}
+
+export interface UnifiedInboxResult {
+  emails: UnifiedEmail[];
+  /** accountId → error message for accounts that could not be fetched. */
+  errors: Record<string, string>;
+}
+
+function authHeaderFor(creds: StoredCredentials): string {
+  if (creds.accessToken) return `Bearer ${creds.accessToken}`;
+  return `Basic ${btoa(`${creds.username}:${creds.password}`)}`;
+}
+
+function originOf(url: string): string | null {
+  const m = url.match(/^(https?:\/\/[^/?#]+)/i);
+  return m ? m[1] : null;
+}
+
+// Same intent as JMAPClient.rewriteSessionUrls: point the advertised apiUrl at
+// the origin we actually connected to (servers often self-report unreachable
+// container-internal hosts).
+function rewriteApiUrl(session: JMAPSession, serverUrl: string): string {
+  const serverOrigin = originOf(serverUrl);
+  const apiOrigin = originOf(session.apiUrl);
+  if (!apiOrigin || !serverOrigin || apiOrigin === serverOrigin) return session.apiUrl;
+  return serverOrigin + session.apiUrl.slice(apiOrigin.length);
+}
+
+function resolveJmapAccountId(session: JMAPSession): string | null {
+  return (
+    session.primaryAccounts?.[CAPABILITIES.MAIL] ||
+    session.primaryAccounts?.[CAPABILITIES.CORE] ||
+    Object.keys(session.accounts ?? {})[0] ||
+    null
+  );
+}
+
+// Refresh an about-to-expire OAuth token and persist it so the next fetch (and
+// a later account switch) reuse the fresh one. Returns possibly-updated creds.
+async function ensureFreshCredentials(
+  accountId: string,
+  creds: StoredCredentials,
+): Promise<StoredCredentials> {
+  if (
+    !creds.accessToken ||
+    !creds.refreshToken ||
+    !creds.tokenEndpoint ||
+    !creds.clientId ||
+    creds.expiresAt == null
+  ) {
+    return creds;
+  }
+  if (creds.expiresAt - Date.now() > TOKEN_REFRESH_LEEWAY_MS) return creds;
+  try {
+    const tokens: OAuthTokens = {
+      accessToken: creds.accessToken,
+      refreshToken: creds.refreshToken,
+      expiresAt: creds.expiresAt,
+      tokenEndpoint: creds.tokenEndpoint,
+      clientId: creds.clientId,
+    };
+    const next = await refreshOAuthAccessToken(tokens);
+    const updated: StoredCredentials = {
+      ...creds,
+      accessToken: next.accessToken,
+      refreshToken: next.refreshToken ?? creds.refreshToken,
+      expiresAt: next.expiresAt,
+      tokenEndpoint: next.tokenEndpoint,
+      clientId: next.clientId,
+    };
+    await jmapClient.setStoredCredentials(accountId, updated);
+    return updated;
+  } catch {
+    // Fall back to the existing (possibly expired) token; the request will
+    // surface a 401 which we report as an error for this account.
+    return creds;
+  }
+}
+
+async function jmapPost(
+  apiUrl: string,
+  authHeader: string,
+  methodCalls: JMAPMethodCall[],
+  using: string[],
+): Promise<Array<[string, Record<string, any>, string]>> {
+  const response = await secureFetch(apiUrl, {
+    method: 'POST',
+    headers: { 'Content-Type': 'application/json', Authorization: authHeader },
+    body: JSON.stringify({ using, methodCalls }),
+  });
+  if (response.status === 401) throw new Error('Session expired');
+  if (!response.ok) throw new Error(`JMAP request failed: ${response.status}`);
+  const body = await response.json();
+  return body.methodResponses ?? [];
+}
+
+// Fetch the most recent inbox messages for a single JMAP account reachable via
+// `apiUrl`/`authHeader`. Returns the bare Email objects; the caller decorates
+// them with registry/sharing metadata.
+async function fetchInboxEmailsForJmapAccount(
+  apiUrl: string,
+  authHeader: string,
+  jmapAccountId: string,
+  limit: number,
+): Promise<Email[]> {
+  const mailboxResponses = await jmapPost(
+    apiUrl,
+    authHeader,
+    [['Mailbox/get', { accountId: jmapAccountId, properties: ['id', 'role', 'name'] }, '0']],
+    [CAPABILITIES.CORE, CAPABILITIES.MAIL],
+  );
+  const mailboxes = (mailboxResponses[0]?.[1]?.list as Mailbox[]) ?? [];
+  const inbox = mailboxes.find((m) => m.role === 'inbox') ?? mailboxes[0];
+  if (!inbox) return [];
+
+  const queryResponses = await jmapPost(
+    apiUrl,
+    authHeader,
+    [['Email/query', {
+      accountId: jmapAccountId,
+      filter: { inMailbox: inbox.id },
+      sort: [{ property: 'receivedAt', isAscending: false }],
+      limit,
+    }, '0']],
+    [CAPABILITIES.CORE, CAPABILITIES.MAIL],
+  );
+  const ids = (queryResponses[0]?.[1]?.ids as string[]) ?? [];
+  if (ids.length === 0) return [];
+
+  const getResponses = await jmapPost(
+    apiUrl,
+    authHeader,
+    [['Email/get', { accountId: jmapAccountId, ids, properties: EMAIL_LIST_PROPERTIES }, '0']],
+    [CAPABILITIES.CORE, CAPABILITIES.MAIL],
+  );
+  return (getResponses[0]?.[1]?.list as Email[]) ?? [];
+}
+
+async function fetchInboxForAccount(
+  accountId: string,
+  limit: number,
+  includeGroup: boolean,
+): Promise<UnifiedEmail[]> {
+  let creds = await jmapClient.getStoredCredentials(accountId);
+  if (!creds) throw new Error('No stored credentials');
+  creds = await ensureFreshCredentials(accountId, creds);
+
+  const baseUrl = creds.serverUrl.replace(/\/+$/, '');
+  const authHeader = authHeaderFor(creds);
+
+  // Session discovery.
+  const sessionRes = await secureFetch(`${baseUrl}/.well-known/jmap`, {
+    headers: { Authorization: authHeader, Accept: 'application/json' },
+  });
+  if (sessionRes.status === 401) throw new Error('Session expired');
+  if (!sessionRes.ok) throw new Error(`Session discovery failed: ${sessionRes.status}`);
+  const session = (await sessionRes.json()) as JMAPSession;
+  const apiUrl = rewriteApiUrl(session, baseUrl);
+  const primaryJmapId = resolveJmapAccountId(session);
+  if (!primaryJmapId) throw new Error('No mail account in session');
+
+  // Always include the user's own primary inbox. When group inboxes are on,
+  // also scan every other (non-personal / shared) account reachable in the
+  // session — these are the group/shared mailboxes the user belongs to.
+  const targets: { jmapId: string; isShared: boolean; label?: string }[] = [
+    { jmapId: primaryJmapId, isShared: false },
+  ];
+  if (includeGroup) {
+    for (const [id, info] of Object.entries(session.accounts ?? {})) {
+      if (id === primaryJmapId) continue;
+      // Only accounts that expose the Mail capability can have an inbox.
+      const hasMail =
+        info.accountCapabilities == null || CAPABILITIES.MAIL in (info.accountCapabilities ?? {});
+      if (!hasMail) continue;
+      targets.push({ jmapId: id, isShared: true, label: info.name });
+    }
+  }
+
+  const perTarget = await Promise.all(
+    targets.map(async (target) => {
+      try {
+        const list = await fetchInboxEmailsForJmapAccount(apiUrl, authHeader, target.jmapId, limit);
+        return list.map<UnifiedEmail>((e) => ({
+          ...e,
+          sourceAccountId: accountId,
+          jmapAccountId: target.jmapId,
+          isShared: target.isShared,
+          sharedLabel: target.isShared ? target.label : undefined,
+        }));
+      } catch {
+        // A single inaccessible shared account shouldn't sink the whole
+        // account's inbox; skip it and keep the others.
+        return [] as UnifiedEmail[];
+      }
+    }),
+  );
+  return perTarget.flat();
+}
+
+export async function fetchUnifiedInbox(
+  accountIds: string[],
+  perAccountLimit = 25,
+  opts: { includeGroup?: boolean } = {},
+): Promise<UnifiedInboxResult> {
+  const { includeGroup = false } = opts;
+  const errors: Record<string, string> = {};
+  const settled = await Promise.all(
+    accountIds.map(async (id) => {
+      try {
+        return await fetchInboxForAccount(id, perAccountLimit, includeGroup);
+      } catch (err) {
+        errors[id] = err instanceof Error ? err.message : 'Failed to load';
+        return [] as UnifiedEmail[];
+      }
+    }),
+  );
+  const emails = settled
+    .flat()
+    .sort((a, b) => new Date(b.receivedAt).getTime() - new Date(a.receivedAt).getTime());
+  return { emails, errors };
+}

src/api/updates.ts

@@ -13,6 +13,45 @@ export interface LatestRelease {
   publishedAt: string;
   body: string;
   apkAsset: ReleaseAsset | null;
+  // Lower-case hex SHA-256 of the APK, parsed from a `*.apk.sha256` companion
+  // asset or from the release body. Null when the release didn't publish one;
+  // the installer falls back to relying solely on Android's package signing
+  // check in that case (still strong, but less defense-in-depth).
+  apkSha256: string | null;
+}
+
+const SHA256_RE = /\b([a-f0-9]{64})\b/i;
+
+function extractSha256(body: string, apkName: string | undefined): string | null {
+  if (!body) return null;
+  // Prefer a line that explicitly references the APK so we don't pick up the
+  // hash of an unrelated asset.
+  const lines = body.split(/\r?\n/);
+  if (apkName) {
+    for (const line of lines) {
+      if (line.includes(apkName)) {
+        const m = SHA256_RE.exec(line);
+        if (m) return m[1].toLowerCase();
+      }
+    }
+  }
+  // Fallback: a single SHA256 anywhere in the body — common when the release
+  // notes just list one checksum.
+  const m = SHA256_RE.exec(body);
+  return m ? m[1].toLowerCase() : null;
+}
+
+async function fetchCompanionSha256(asset: ReleaseAsset | undefined): Promise<string | null> {
+  if (!asset) return null;
+  try {
+    const res = await fetch(asset.browser_download_url);
+    if (!res.ok) return null;
+    const text = await res.text();
+    const m = SHA256_RE.exec(text);
+    return m ? m[1].toLowerCase() : null;
+  } catch {
+    return null;
+  }
 }
 
 export async function fetchLatestRelease(repo: string = UPDATE_REPO): Promise<LatestRelease | null> {
@@ -32,6 +71,14 @@ export async function fetchLatestRelease(repo: string = UPDATE_REPO): Promise<La
     assets: ReleaseAsset[];
   };
   const apkAsset = json.assets.find((a) => a.name.endsWith('.apk')) ?? null;
+  const sha256Asset = apkAsset
+    ? json.assets.find(
+        (a) => a.name === `${apkAsset.name}.sha256` || a.name === `${apkAsset.name}.SHA256`,
+      )
+    : undefined;
+  const apkSha256 =
+    (await fetchCompanionSha256(sha256Asset)) ??
+    extractSha256(json.body || '', apkAsset?.name);
   return {
     tag: json.tag_name,
     name: json.name || json.tag_name,
@@ -39,5 +86,6 @@ export async function fetchLatestRelease(repo: string = UPDATE_REPO): Promise<La
     publishedAt: json.published_at,
     body: json.body || '',
     apkAsset,
+    apkSha256,
   };
 }

src/components/EmailBodyView.tsx

@@ -3,7 +3,7 @@ import { View, StyleSheet, Linking, Platform, Text, Pressable } from 'react-nati
 import { WebView, type WebViewMessageEvent } from 'react-native-webview';
 import { Image as ImageIcon, ShieldCheck } from 'lucide-react-native';
 import type { Email } from '../api/types';
-import { wrapEmailHtml, wrapPlainTextEmail, plainTextToSafeHtml, extractCidRefs, hasRemoteContent, hasMeaningfulHtmlBody } from '../lib/email-html';
+import { wrapEmailHtml, wrapPlainTextEmail, plainTextToSafeHtml, extractCidRefs, hasRemoteContent, hasMeaningfulHtmlBody, hasNativeDarkMode } from '../lib/email-html';
 import { jmapClient } from '../api/jmap-client';
 import { useSettingsStore } from '../stores/settings-store';
 import { useContactsStore } from '../stores/contacts-store';
@@ -27,6 +27,15 @@ function arrayBufferToBase64(buffer: ArrayBuffer): string {
 interface EmailBodyViewProps {
   email: Email;
   senderEmail?: string;
+  // The body is a native WebView, which on Android swallows horizontal touches
+  // before the surrounding pager can see them. We detect a clear horizontal
+  // swipe inside the page and report it here so the pager can change messages.
+  onSwipe?: (direction: 'prev' | 'next') => void;
+  // Pinch-zoom state from inside the page: `pinching` while two fingers are
+  // down, `zoomed` while the content is scaled in. The hosts use it to freeze
+  // the surrounding vertical scroll / horizontal pager so a zoom gesture can't
+  // scroll the pane away or switch mails.
+  onZoomChange?: (zoom: { pinching: boolean; zoomed: boolean }) => void;
 }
 
 function extractHtmlBody(email: Email): string | null {
@@ -45,29 +54,188 @@ function extractTextBody(email: Email): string | null {
   return null;
 }
 
+// Dark-mode re-inversion, mirroring the webmail's handleIframeLoad pass. The
+// body's `filter: invert(1)` flips colored emoji (yellow smiley -> blue, red
+// heart -> cyan) and stylesheet-defined background images, which the static CSS
+// attribute selectors can't reach. This walks the DOM once and wraps/re-inverts
+// those so they keep their original colors. Only injected when inversion is on.
+const DARK_REINVERT_SCRIPT = `
+(function () {
+  if (document.__rnDarkInvertDone) return;
+  var doc = document;
+  var win = window;
+  if (!doc.body) return;
+  document.__rnDarkInvertDone = true;
+
+  // Re-invert elements with stylesheet-defined background images (CSS attribute
+  // selectors only catch inline styles, not rules that survive in <style>).
+  doc.body.querySelectorAll('*').forEach(function (el) {
+    // Skip elements already handled by CSS attribute selectors.
+    if (el.style.backgroundImage || el.style.background ||
+        el.hasAttribute('background') || el.hasAttribute('bgcolor')) return;
+    // Skip leaf media elements (already re-inverted by CSS).
+    var tag = el.tagName;
+    if (['IMG','VIDEO','SVG','CANVAS','OBJECT','EMBED'].indexOf(tag) !== -1) return;
+    var computed = win.getComputedStyle(el);
+    if (computed.backgroundImage && computed.backgroundImage !== 'none') {
+      // Only re-invert if this container doesn't have media children.
+      if (!el.querySelector('img, video, svg, canvas, object, embed')) {
+        el.style.filter = 'invert(1) hue-rotate(180deg)';
+      }
+    }
+  });
+
+  // Re-invert emoji glyphs so they keep their original colors. Wrap each emoji
+  // run in a span that re-inverts. Only act when the ancestor invert depth is
+  // odd - emojis inside a double-inverted bgcolor container already render at
+  // their original colors.
+  var emojiRe;
+  try {
+    emojiRe = new RegExp('\\\\p{RGI_Emoji}', 'gv');
+  } catch (e) {
+    emojiRe = /\\p{Extended_Pictographic}(?:\\uFE0F)?(?:\\u200D\\p{Extended_Pictographic}(?:\\uFE0F)?)*/gu;
+  }
+  var emojiTestRe = /\\p{Extended_Pictographic}/u;
+  var SKIP_TAGS = { SCRIPT: 1, STYLE: 1, NOSCRIPT: 1, TEXTAREA: 1, IFRAME: 1 };
+
+  function isOddInvertDepth(start) {
+    var count = 0;
+    var n = start;
+    while (n) {
+      if (n === doc.body) { count++; break; }
+      var cs = win.getComputedStyle(n);
+      if (cs.filter && cs.filter.indexOf('invert') !== -1) count++;
+      n = n.parentElement;
+    }
+    return count % 2 === 1;
+  }
+
+  var walker = doc.createTreeWalker(doc.body, NodeFilter.SHOW_TEXT, {
+    acceptNode: function (node) {
+      var p = node.parentElement;
+      while (p) {
+        if (SKIP_TAGS[p.tagName]) return NodeFilter.FILTER_REJECT;
+        p = p.parentElement;
+      }
+      return emojiTestRe.test(node.nodeValue || '')
+        ? NodeFilter.FILTER_ACCEPT
+        : NodeFilter.FILTER_REJECT;
+    }
+  });
+
+  var emojiTextNodes = [];
+  var cur;
+  while ((cur = walker.nextNode())) emojiTextNodes.push(cur);
+
+  emojiTextNodes.forEach(function (textNode) {
+    var parent = textNode.parentElement;
+    if (!parent || !isOddInvertDepth(parent)) return;
+    var text = textNode.nodeValue || '';
+    emojiRe.lastIndex = 0;
+    var frag = doc.createDocumentFragment();
+    var lastIndex = 0;
+    var m;
+    while ((m = emojiRe.exec(text)) !== null) {
+      if (m.index > lastIndex) {
+        frag.appendChild(doc.createTextNode(text.slice(lastIndex, m.index)));
+      }
+      var span = doc.createElement('span');
+      span.style.cssText = 'filter:invert(1) hue-rotate(180deg)';
+      span.textContent = m[0];
+      frag.appendChild(span);
+      lastIndex = m.index + m[0].length;
+    }
+    if (lastIndex === 0) return;
+    if (lastIndex < text.length) {
+      frag.appendChild(doc.createTextNode(text.slice(lastIndex)));
+    }
+    parent.replaceChild(frag, textNode);
+  });
+})();
+`;
+
 const HEIGHT_REPORTER = `
 (function () {
   // One-time: wrap body contents in a block-level div we can measure reliably.
   // body.scrollHeight on Android WebView is pinned to the container viewport
   // height, so we can't trust it. A dedicated wrapper gives a deterministic
   // bounding box.
+  var wrapperEl = null;
   function ensureWrapper() {
     var b = document.body;
     if (!b) return null;
+    if (wrapperEl && wrapperEl.isConnected) return wrapperEl;
     var wrap = document.getElementById('__rn_email_body_wrap__');
     if (!wrap) {
       wrap = document.createElement('div');
       wrap.id = '__rn_email_body_wrap__';
       wrap.style.display = 'block';
       wrap.style.width = '100%';
+      wrap.style.transformOrigin = 'top left';
       while (b.firstChild) wrap.appendChild(b.firstChild);
       b.appendChild(wrap);
     }
+    wrapperEl = wrap;
     return wrap;
   }
+  // The width available for the email content (body content-box).
+  function availWidth() {
+    var b = document.body;
+    var cs = window.getComputedStyle(b);
+    var padL = parseFloat(cs.paddingLeft) || 0;
+    var padR = parseFloat(cs.paddingRight) || 0;
+    return b.clientWidth - padL - padR;
+  }
+  // Shared zoom state, mutated by the pinch-zoom handler injected after this
+  // script. "fit" is the shrink-to-fit scale, "scale" the user's pinch factor
+  // on top of it, "tx" pans the zoomed overflow into view horizontally.
+  // Vertical panning needs no state here: the height reports below carry the
+  // scaled height, so the surrounding native ScrollView grows and scrolls.
+  var Z = window.__rnZoom = window.__rnZoom || {
+    scale: 1, tx: 0, pinching: false, fit: 1, layoutW: 0, avail: 0,
+  };
+  // Apply the combined fit × pinch transform using the cached layout numbers
+  // (cheap — no reflow), clamping the pan so content edges pin to the viewport.
+  function applyTransform(w) {
+    var s = Z.fit * Z.scale;
+    if (Z.scale > 1.001 || Z.fit < 0.999) {
+      var minTx = Math.min(0, Z.avail - Z.layoutW * s);
+      if (Z.tx < minTx) Z.tx = minTx;
+      if (Z.tx > 0) Z.tx = 0;
+      w.style.width = Z.layoutW + 'px';
+      w.style.transform = 'translateX(' + Z.tx + 'px) scale(' + s + ')';
+    } else {
+      Z.tx = 0;
+      w.style.width = '100%';
+      w.style.transform = 'none';
+    }
+  }
+  // Shrink-to-fit: emails authored at a fixed width (e.g. 600px tables) overflow
+  // a phone viewport and force horizontal scrolling. Lay the content out at its
+  // natural width, then scale the whole block down so its widest element fits
+  // the screen — the way native mail clients do. No sideways scrolling.
+  function fitToWidth(w) {
+    if (!w) return;
+    var avail = availWidth();
+    if (avail <= 0) return;
+    // Reset to full width so wrapping content reports its true overflow extent
+    // (the widest unbreakable element) rather than a previously-scaled box.
+    w.style.width = '100%';
+    var content = w.scrollWidth;
+    Z.avail = avail;
+    Z.layoutW = content > avail + 1 ? content : avail;
+    Z.fit = avail / Z.layoutW;
+    applyTransform(w);
+  }
   function measure() {
     var w = ensureWrapper();
     if (!w) return 0;
+    // While a pinch is in flight only re-apply the transform — a full re-fit
+    // resets the wrapper width and would thrash layout on every frame.
+    if (Z.pinching) applyTransform(w);
+    else fitToWidth(w);
+    // getBoundingClientRect reflects the applied transform, so r.height is the
+    // already-scaled visual height of the content.
     var r = w.getBoundingClientRect();
     var b = document.body;
     var cs = window.getComputedStyle(b);
@@ -117,7 +285,16 @@ const HEIGHT_REPORTER = `
     if (document.body) ro.observe(document.body);
   } catch (e) {}
   try {
-    var mo = new MutationObserver(report);
+    var mo = new MutationObserver(function (records) {
+      for (var i = 0; i < records.length; i++) {
+        // Ignore the style mutations fitToWidth() applies to the wrapper itself,
+        // otherwise scaling would re-trigger a measure and loop indefinitely.
+        var rec = records[i];
+        if (rec.target === wrapperEl && rec.type === 'attributes') continue;
+        report();
+        return;
+      }
+    });
     if (document.body) mo.observe(document.body, { childList: true, subtree: true, attributes: true, characterData: true });
   } catch (e) {}
   try {
@@ -126,11 +303,161 @@ const HEIGHT_REPORTER = `
       img.addEventListener('error', report);
     });
   } catch (e) {}
+  // Hooks for the pinch-zoom handler script.
+  window.__rnApplyZoom = function () { var w = ensureWrapper(); if (w) applyTransform(w); };
+  window.__rnReport = report;
   true;
 })();
 `;
 
-export default function EmailBodyView({ email, senderEmail }: EmailBodyViewProps) {
+// Detect a clear horizontal flick inside the WebView and report it. Uses
+// capture-phase, passive listeners so it never blocks vertical scrolling, text
+// selection, or link taps — it only reacts to a quick, horizontal-dominant
+// gesture on release. Guarded so re-injection (onLoadEnd) is a no-op.
+const SWIPE_DETECTOR = `
+(function () {
+  if (window.__rnSwipeInit) return;
+  window.__rnSwipeInit = true;
+  var x0 = 0, y0 = 0, t0 = 0, tracking = false;
+  document.addEventListener('touchstart', function (e) {
+    if (e.touches.length !== 1) { tracking = false; return; }
+    var t = e.touches[0];
+    x0 = t.clientX; y0 = t.clientY; t0 = Date.now(); tracking = true;
+  }, { passive: true, capture: true });
+  document.addEventListener('touchend', function (e) {
+    if (!tracking) return;
+    tracking = false;
+    // While the content is pinch-zoomed, horizontal flicks pan the zoomed
+    // content — never switch mails.
+    if (window.__rnZoom && (window.__rnZoom.pinching || window.__rnZoom.scale > 1.001)) return;
+    var t = e.changedTouches[0];
+    if (!t) return;
+    var dx = t.clientX - x0, dy = t.clientY - y0, dt = Date.now() - t0;
+    if (dt < 700 && Math.abs(dx) > 55 && Math.abs(dx) > Math.abs(dy) * 1.8) {
+      if (window.ReactNativeWebView) {
+        window.ReactNativeWebView.postMessage(JSON.stringify({ type: 'swipe', dir: dx < 0 ? 'next' : 'prev' }));
+      }
+    }
+  }, { passive: true, capture: true });
+  true;
+})();
+`;
+
+// Pinch zoom + pan for the email content, driven entirely in the page: native
+// WebView zoom can't work here because the WebView is auto-height inside a
+// native ScrollView (viewport meta pins it to scale 1). A two-finger pinch
+// scales the measured wrapper (on top of the shrink-to-fit scale the height
+// reporter maintains) anchored at the fingers' horizontal midpoint; while
+// zoomed, one-finger horizontal drags pan via translateX and vertical drags
+// still scroll the surrounding ScrollView, which sees the scaled height
+// through the regular height reports. Pinch moves call preventDefault so the
+// engine consumes the gesture and Android parents don't intercept it; `zoom`
+// messages let the RN side freeze the pane scroll / pager as a second guard.
+const PINCH_ZOOM = `
+(function () {
+  if (window.__rnPinchInit) return;
+  window.__rnPinchInit = true;
+  var Z = window.__rnZoom = window.__rnZoom || {
+    scale: 1, tx: 0, pinching: false, fit: 1, layoutW: 0, avail: 0,
+  };
+  var MAX_ZOOM = 4;
+  var pinch = null; // { d0, s0, cx0, tx0 }
+  var pan = null;   // { x0, tx0 }
+  var rafPending = false;
+
+  function post(msg) {
+    if (window.ReactNativeWebView) {
+      window.ReactNativeWebView.postMessage(JSON.stringify(msg));
+    }
+  }
+  function apply() {
+    if (window.__rnApplyZoom) window.__rnApplyZoom();
+  }
+  // Height reports are rAF-throttled during the gesture so the RN container
+  // keeps up with the growing content without re-measuring on every move.
+  function scheduleReport() {
+    if (rafPending) return;
+    rafPending = true;
+    requestAnimationFrame(function () {
+      rafPending = false;
+      if (window.__rnReport) window.__rnReport();
+    });
+  }
+  function dist(t0, t1) {
+    var dx = t1.clientX - t0.clientX, dy = t1.clientY - t0.clientY;
+    return Math.sqrt(dx * dx + dy * dy);
+  }
+
+  document.addEventListener('touchstart', function (e) {
+    if (e.touches.length === 2) {
+      var t0 = e.touches[0], t1 = e.touches[1];
+      pinch = {
+        d0: dist(t0, t1) || 1,
+        s0: Z.scale,
+        cx0: (t0.clientX + t1.clientX) / 2,
+        tx0: Z.tx,
+      };
+      pan = null;
+      if (!Z.pinching) {
+        Z.pinching = true;
+        post({ type: 'zoom', pinching: true, scale: Z.scale });
+      }
+      e.preventDefault();
+    } else if (e.touches.length === 1 && Z.scale > 1.001) {
+      pan = { x0: e.touches[0].clientX, tx0: Z.tx };
+    } else {
+      pan = null;
+    }
+  }, { passive: false, capture: true });
+
+  document.addEventListener('touchmove', function (e) {
+    if (pinch && e.touches.length === 2) {
+      e.preventDefault();
+      var t0 = e.touches[0], t1 = e.touches[1];
+      var z = pinch.s0 * (dist(t0, t1) / pinch.d0);
+      if (z < 1) z = 1;
+      if (z > MAX_ZOOM) z = MAX_ZOOM;
+      // Keep the content under the fingers' midpoint stationary horizontally:
+      // the wrapper-local point that started under cx0 must map back to the
+      // current midpoint at the new scale. (applyTransform clamps the result.)
+      var cx = (t0.clientX + t1.clientX) / 2;
+      var local = (pinch.cx0 - pinch.tx0) / (Z.fit * pinch.s0);
+      Z.scale = z;
+      Z.tx = cx - local * (Z.fit * z);
+      apply();
+      scheduleReport();
+    } else if (pan && e.touches.length === 1 && Z.scale > 1.001) {
+      // No preventDefault: vertical-dominant drags must keep scrolling the
+      // native ScrollView around the WebView. Horizontal-dominant drags stay
+      // inside the WebView and pan here.
+      Z.tx = pan.tx0 + (e.touches[0].clientX - pan.x0);
+      apply();
+    }
+  }, { passive: false, capture: true });
+
+  function onTouchEnd(e) {
+    if (pinch && e.touches.length < 2) {
+      pinch = null;
+      // Snap back to the fitted layout when the pinch ends near scale 1.
+      if (Z.scale < 1.02) { Z.scale = 1; Z.tx = 0; }
+      Z.pinching = false;
+      apply();
+      if (window.__rnReport) window.__rnReport();
+      post({ type: 'zoom', pinching: false, scale: Z.scale });
+      // A finger left on screen continues as a pan.
+      if (e.touches.length === 1 && Z.scale > 1.001) {
+        pan = { x0: e.touches[0].clientX, tx0: Z.tx };
+      }
+    }
+    if (e.touches.length === 0) pan = null;
+  }
+  document.addEventListener('touchend', onTouchEnd, { passive: true, capture: true });
+  document.addEventListener('touchcancel', onTouchEnd, { passive: true, capture: true });
+  true;
+})();
+`;
+
+export default function EmailBodyView({ email, senderEmail, onSwipe, onZoomChange }: EmailBodyViewProps) {
   const c = useColors();
   const styles = React.useMemo(() => makeStyles(c), [c]);
   const externalContentPolicy = useSettingsStore((s) => s.externalContentPolicy);
@@ -140,7 +467,18 @@ export default function EmailBodyView({ email, senderEmail }: EmailBodyViewProps
   const emailAlwaysLightMode = useSettingsStore((s) => s.emailAlwaysLightMode);
   const hideInlineImageAttachments = useSettingsStore((s) => s.hideInlineImageAttachments);
   const contacts = useContactsStore((s) => s.contacts);
+  const trustedSenderEmails = useContactsStore((s) => s.trustedSenderEmails);
+  const trustedSendersLoaded = useContactsStore((s) => s.trustedSendersLoaded);
+  const loadTrustedSendersBook = useContactsStore((s) => s.loadTrustedSendersBook);
+  const addToTrustedSendersBook = useContactsStore((s) => s.addToTrustedSendersBook);
   const resolvedTheme = useResolvedTheme();
+
+  // Passively load the dedicated "Trusted Senders" address book once so its
+  // entries (synced across devices) feed the external-content trust check. We
+  // do not create the book here — it is created lazily when a sender is trusted.
+  React.useEffect(() => {
+    if (!trustedSendersLoaded) void loadTrustedSendersBook(false);
+  }, [trustedSendersLoaded, loadTrustedSendersBook]);
   // Index the address book once per render so the trusted-sender check below
   // is O(1) per email. Only used when the matching setting is on.
   const addressBookEmails = React.useMemo(() => {
@@ -170,6 +508,7 @@ export default function EmailBodyView({ email, senderEmail }: EmailBodyViewProps
   const hasRemote = rawHtml ? hasRemoteContent(rawHtml) : false;
   const trusted = senderEmail
     ? isSenderTrusted(senderEmail)
+      || trustedSenderEmails.includes(senderEmail.toLowerCase())
       || (addressBookEmails?.has(senderEmail.toLowerCase()) ?? false)
     : false;
 
@@ -261,8 +600,36 @@ export default function EmailBodyView({ email, senderEmail }: EmailBodyViewProps
     };
   }, [rawHtml, text, email.preview, shouldBlock, cidMap, renderAsDark]);
 
+  // Inversion is applied for HTML bodies in dark mode unless the email ships its
+  // own dark-mode CSS. When it's on, prepend the DOM re-inversion pass (emoji +
+  // stylesheet backgrounds) so it runs before the height reporter measures.
+  const applyInversion =
+    !!rawHtml && renderAsDark && !hasNativeDarkMode(rawHtml);
+  const injectedJs = React.useMemo(
+    () =>
+      (applyInversion ? DARK_REINVERT_SCRIPT + HEIGHT_REPORTER : HEIGHT_REPORTER)
+      + SWIPE_DETECTOR + PINCH_ZOOM,
+    [applyInversion],
+  );
+
   const onMessage = (e: WebViewMessageEvent) => {
-    const parsed = parseInt(e.nativeEvent.data, 10);
+    const data = e.nativeEvent.data;
+    // Swipe/zoom messages arrive as JSON; the height reporter posts a bare number.
+    if (data.charCodeAt(0) === 123 /* '{' */) {
+      try {
+        const msg = JSON.parse(data);
+        if (msg.type === 'swipe' && (msg.dir === 'prev' || msg.dir === 'next')) {
+          onSwipe?.(msg.dir);
+        } else if (msg.type === 'zoom') {
+          onZoomChange?.({
+            pinching: !!msg.pinching,
+            zoomed: typeof msg.scale === 'number' && msg.scale > 1.01,
+          });
+        }
+      } catch { /* ignore malformed */ }
+      return;
+    }
+    const parsed = parseInt(data, 10);
     if (Number.isNaN(parsed) || parsed <= 0) return;
     setHeight((prev) => (Math.abs(parsed - prev) < 2 ? prev : parsed));
   };
@@ -270,7 +637,11 @@ export default function EmailBodyView({ email, senderEmail }: EmailBodyViewProps
   const onLoadImages = () => setAllowOnce(true);
   const onTrustSender = () => {
     if (senderEmail) {
+      // Keep the local allow-list for instant effect, and persist to the
+      // dedicated "Trusted Senders" address book so the trust syncs across
+      // devices (matches the webmail behavior).
       addTrustedSender(senderEmail);
+      void addToTrustedSendersBook(senderEmail).catch(() => {});
       setAllowOnce(true);
     }
   };
@@ -297,19 +668,28 @@ export default function EmailBodyView({ email, senderEmail }: EmailBodyViewProps
       <View style={[styles.webContainer, { height }]}>
         <WebView
           ref={webviewRef}
-          originWhitelist={['about:*']}
+          originWhitelist={['about:blank']}
           source={source}
           javaScriptEnabled
-          injectedJavaScript={HEIGHT_REPORTER}
+          injectedJavaScript={injectedJs}
           onMessage={onMessage}
           onLoadEnd={() => {
+            // A (re)load resets the page's zoom state to 1 — drop any host-side
+            // scroll locks so they can't go stale (e.g. cid images arriving
+            // reload the source mid-zoom).
+            onZoomChange?.({ pinching: false, zoomed: false });
             // Re-inject after load to cover Android cases where
-            // `injectedJavaScript` runs too early to see the final layout.
+            // `injectedJavaScript` runs too early to see the final layout. The
+            // re-inversion pass guards itself (__rnDarkInvertDone) so running it
+            // again here is a no-op once the body has been processed.
             setTimeout(() => {
-              webviewRef.current?.injectJavaScript(HEIGHT_REPORTER);
+              webviewRef.current?.injectJavaScript(injectedJs);
             }, 50);
           }}
           scrollEnabled={false}
+          // Native Android zoom would scale the viewport inside the fixed-size
+          // container; pinch zoom is implemented in the page instead.
+          setBuiltInZoomControls={false}
           showsVerticalScrollIndicator={false}
           showsHorizontalScrollIndicator={false}
           setSupportMultipleWindows={false}

src/components/OfflineBanner.tsx

@@ -2,6 +2,7 @@ import React from 'react';
 import { View, Text, StyleSheet } from 'react-native';
 import { CloudOff } from 'lucide-react-native';
 import { useNetworkStore } from '../stores/network-store';
+import { useOutboxStore } from '../stores/outbox-store';
 import { spacing, typography, type ThemePalette } from '../theme/tokens';
 import { useColors } from '../theme/colors';
 
@@ -14,12 +15,18 @@ export function OfflineBanner({ hint }: OfflineBannerProps) {
   const c = useColors();
   const styles = React.useMemo(() => makeStyles(c), [c]);
   const online = useNetworkStore((s) => s.online);
+  // Pending offline mutations that will replay once we're back online.
+  const queued = useOutboxStore((s) => s.entries.length);
   if (online) return null;
+  const queuedHint = queued > 0
+    ? `${queued} change${queued === 1 ? '' : 's'} will sync when you reconnect`
+    : null;
+  const suffix = [hint, queuedHint].filter(Boolean).join(' · ');
   return (
     <View style={styles.bar}>
       <CloudOff size={14} color={c.primaryForeground} />
       <Text style={styles.text} numberOfLines={1}>
-        You are offline{hint ? ` — ${hint}` : ''}
+        You are offline{suffix ? ` — ${suffix}` : ''}
       </Text>
     </View>
   );

src/components/OfflineCacheBanner.tsx

@@ -3,8 +3,10 @@
 
 import React from 'react';
 import { View, Text, StyleSheet, Pressable } from 'react-native';
+import { useSafeAreaInsets } from 'react-native-safe-area-context';
 import { CloudDownload, X } from 'lucide-react-native';
 import { useOfflineCacheStore } from '../stores/offline-cache-store';
+import { useUpdatesStore } from '../stores/updates-store';
 import { formatBytes } from '../lib/offline-sync';
 import { spacing, radius, typography, type ThemePalette } from '../theme/tokens';
 import { useColors } from '../theme/colors';
@@ -12,9 +14,18 @@ import { useColors } from '../theme/colors';
 export function OfflineCacheBanner(): React.ReactElement | null {
   const c = useColors();
   const styles = React.useMemo(() => makeStyles(c), [c]);
+  const insets = useSafeAreaInsets();
   const sync = useOfflineCacheStore((s) => s.sync);
   const requestAbort = useOfflineCacheStore((s) => s.requestAbort);
   const resetSync = useOfflineCacheStore((s) => s.resetSync);
+  // When UpdateBanner is stacked above us it already absorbs the status-bar
+  // inset, so we only add it when we're the topmost banner.
+  const cachedLatest = useUpdatesStore((s) => s.cachedLatest);
+  const dismissedTag = useUpdatesStore((s) => s.dismissedTag);
+  const hasUpdate = useUpdatesStore((s) => s.hasUpdate);
+  const updateBannerVisible =
+    hasUpdate() && cachedLatest?.apkAsset != null && dismissedTag !== cachedLatest.tag;
+  const topInset = updateBannerVisible ? 0 : insets.top;
   const [hideTimer, setHideTimer] = React.useState<ReturnType<typeof setTimeout> | null>(null);
 
   // Auto-dismiss the "done" state after a few seconds so the bar isn't a
@@ -71,7 +82,7 @@ export function OfflineCacheBanner(): React.ReactElement | null {
   const isError = sync.phase === 'error';
 
   return (
-    <View style={[styles.banner, isError && styles.bannerError]}>
+    <View style={[styles.banner, isError && styles.bannerError, { paddingTop: spacing.sm + topInset }]}>
       <CloudDownload size={16} color={c.primaryForeground} />
       <View style={{ flex: 1 }}>
         <Text style={styles.title}>{title}</Text>

src/components/QrScanModal.tsx

@@ -0,0 +1,124 @@
+import React from 'react';
+import { View, Text, Pressable, StyleSheet, Modal, Platform } from 'react-native';
+import { SafeAreaView } from 'react-native-safe-area-context';
+import { CameraView, useCameraPermissions, type BarcodeScanningResult } from 'expo-camera';
+import { X } from 'lucide-react-native';
+import { spacing, radius, typography, type ThemePalette } from '../theme/tokens';
+import { useColors } from '../theme/colors';
+import Button from './Button';
+
+interface QrScanModalProps {
+  visible: boolean;
+  onClose: () => void;
+  // Fires once with the raw decoded QR string. The parent is responsible for
+  // closing the modal and interpreting the payload.
+  onScanned: (data: string) => void;
+}
+
+export function QrScanModal({ visible, onClose, onScanned }: QrScanModalProps) {
+  const c = useColors();
+  const styles = React.useMemo(() => makeStyles(c), [c]);
+  const [permission, requestPermission] = useCameraPermissions();
+  // Guards against the camera firing onBarcodeScanned dozens of times for the
+  // same code before the modal tears down.
+  const handled = React.useRef(false);
+
+  React.useEffect(() => {
+    if (visible) handled.current = false;
+  }, [visible]);
+
+  const handleBarcode = React.useCallback(
+    (result: BarcodeScanningResult) => {
+      if (handled.current) return;
+      handled.current = true;
+      onScanned(result.data);
+    },
+    [onScanned],
+  );
+
+  return (
+    <Modal visible={visible} animationType="slide" onRequestClose={onClose} statusBarTranslucent>
+      <View style={styles.container}>
+        {permission?.granted ? (
+          <CameraView
+            style={StyleSheet.absoluteFill}
+            facing="back"
+            barcodeScannerSettings={{ barcodeTypes: ['qr'] }}
+            onBarcodeScanned={handleBarcode}
+          />
+        ) : null}
+
+        <SafeAreaView style={styles.overlay}>
+          <View style={styles.header}>
+            <Pressable onPress={onClose} hitSlop={10} style={styles.closeButton}>
+              <X size={24} color="#ffffff" />
+            </Pressable>
+            <Text style={styles.title}>Scan QR code</Text>
+            <View style={styles.closeButton} />
+          </View>
+
+          {permission?.granted ? (
+            <View style={styles.frameWrap}>
+              <View style={styles.frame} />
+              <Text style={styles.hint}>
+                Point your camera at the QR code shown on the webmail settings screen.
+              </Text>
+            </View>
+          ) : (
+            <View style={styles.permissionWrap}>
+              <Text style={styles.permissionText}>
+                {permission && !permission.canAskAgain
+                  ? 'Camera access is disabled. Enable it in Settings to scan a sign-in QR code.'
+                  : 'Bulwark Mail needs camera access to scan a sign-in QR code.'}
+              </Text>
+              <Button variant="default" size="md" onPress={() => void requestPermission()}>
+                Allow camera access
+              </Button>
+            </View>
+          )}
+        </SafeAreaView>
+      </View>
+    </Modal>
+  );
+}
+
+function makeStyles(c: ThemePalette) {
+  return StyleSheet.create({
+    container: { flex: 1, backgroundColor: '#000000' },
+    overlay: { flex: 1, justifyContent: 'flex-start' },
+    header: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      justifyContent: 'space-between',
+      paddingHorizontal: spacing.lg,
+      paddingTop: Platform.OS === 'android' ? spacing.xl : spacing.sm,
+      paddingBottom: spacing.md,
+    },
+    closeButton: { width: 32, height: 32, alignItems: 'center', justifyContent: 'center' },
+    title: { ...typography.h3, color: '#ffffff' },
+    frameWrap: { flex: 1, alignItems: 'center', justifyContent: 'center', gap: spacing.lg },
+    frame: {
+      width: 240,
+      height: 240,
+      borderWidth: 3,
+      borderColor: '#ffffff',
+      borderRadius: radius.lg,
+      backgroundColor: 'transparent',
+    },
+    hint: {
+      ...typography.caption,
+      color: '#ffffff',
+      textAlign: 'center',
+      paddingHorizontal: spacing.xxl,
+    },
+    permissionWrap: {
+      flex: 1,
+      alignItems: 'center',
+      justifyContent: 'center',
+      gap: spacing.lg,
+      paddingHorizontal: spacing.xxl,
+      backgroundColor: c.background,
+    },
+    permissionText: { ...typography.body, color: c.text, textAlign: 'center' },
+  });
+}

src/components/RichTextEditor.tsx

@@ -263,20 +263,30 @@ function buildEditorHtml(opts: {
     },
     insertLink: function (url, label) {
       editor.focus();
+      // Reject anything that isn't a safe scheme or an absolute path, so the
+      // user can't accidentally (or via a malicious paste) ship a
+      // javascript:/data: link to their recipient.
+      var safeSchemeRe = /^(https?:|mailto:|tel:|sms:|\/|\?|#)/i;
+      var trimmed = (url || '').trim();
+      if (!trimmed || !safeSchemeRe.test(trimmed)) return;
       var sel = window.getSelection();
       var hasSelection = sel && sel.rangeCount && !sel.getRangeAt(0).collapsed;
       if (hasSelection) {
-        try { document.execCommand('createLink', false, url); } catch (e) {}
+        try { document.execCommand('createLink', false, trimmed); } catch (e) {}
         // execCommand doesn't set rel; tag every anchor that points at this URL.
         Array.prototype.forEach.call(editor.getElementsByTagName('a'), function (a) {
-          if (a.getAttribute('href') === url) {
+          if (a.getAttribute('href') === trimmed) {
             a.setAttribute('rel', 'noopener noreferrer nofollow');
           }
         });
       } else {
-        var text = label && label.trim() ? label : url;
+        var text = label && label.trim() ? label : trimmed;
         var safe = text.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;');
-        var safeUrl = url.replace(/"/g, '&quot;');
+        var safeUrl = trimmed
+          .replace(/&/g, '&amp;')
+          .replace(/"/g, '&quot;')
+          .replace(/</g, '&lt;')
+          .replace(/>/g, '&gt;');
         var html = '<a href="' + safeUrl + '" rel="noopener noreferrer nofollow">' + safe + '</a>';
         try { document.execCommand('insertHTML', false, html); } catch (e) {}
       }
@@ -409,7 +419,7 @@ const RichTextEditor = React.forwardRef<RichTextEditorHandle, Props>(function Ri
     <View style={[styles.container, { height }]}>
       <WebView
         ref={webViewRef}
-        originWhitelist={['about:*']}
+        originWhitelist={['about:blank']}
         source={{ html }}
         onMessage={onMessage}
         javaScriptEnabled
@@ -433,9 +443,11 @@ const RichTextEditor = React.forwardRef<RichTextEditorHandle, Props>(function Ri
         style={styles.webview}
         containerStyle={styles.webviewContainer}
         onShouldStartLoadWithRequest={(request) => {
-          // Allow only the initial about:blank doc + data URIs we emit ourselves.
+          // Allow only the initial about:blank doc + data URIs we emit
+          // ourselves. Reject `about:*` (e.g. about:srcdoc) and every other
+          // scheme so a paste-injected anchor can't navigate the editor.
           const url = request.url;
-          return !url || url === 'about:blank' || url.startsWith('data:') || url.startsWith('about:');
+          return !url || url === 'about:blank' || url.startsWith('data:');
         }}
       />
     </View>

src/components/SidebarDrawer.tsx

@@ -8,6 +8,7 @@ import { SafeAreaView } from 'react-native-safe-area-context';
 import {
   Inbox, Send, File as FileIcon, Trash2, Ban, Archive, Star,
   Folder, FolderOpen, ChevronDown, ChevronRight, X, Settings, LogOut, Check, Plus,
+  Clock, Layers,
 } from 'lucide-react-native';
 import type { LucideIcon } from 'lucide-react-native';
 import { spacing, radius, typography, type ThemePalette } from '../theme/tokens';
@@ -427,6 +428,24 @@ export default function SidebarDrawer({ visible, onClose }: SidebarDrawerProps)
           )}
 
           <ScrollView style={styles.scroll} contentContainerStyle={styles.scrollContent}>
+            {/* Quick views */}
+            {accounts.length > 1 && (
+              <Pressable
+                style={({ pressed }) => [styles.quickRow, pressed && styles.rowPressed]}
+                onPress={() => { onClose(); navigation.navigate('UnifiedInbox'); }}
+              >
+                <Layers size={16} color={c.textSecondary} />
+                <Text style={styles.quickRowLabel}>All inboxes</Text>
+              </Pressable>
+            )}
+            <Pressable
+              style={({ pressed }) => [styles.quickRow, pressed && styles.rowPressed]}
+              onPress={() => { onClose(); navigation.navigate('Scheduled'); }}
+            >
+              <Clock size={16} color={c.textSecondary} />
+              <Text style={styles.quickRowLabel}>Scheduled</Text>
+            </Pressable>
+
             {/* Folders section */}
             <Pressable style={styles.sectionHeader} onPress={toggleFoldersSection}>
               {foldersExpanded ? (
@@ -667,6 +686,17 @@ function makeStyles(c: ThemePalette) {
   },
   sectionSettings: { padding: 4 },
 
+  quickRow: {
+    flexDirection: 'row',
+    alignItems: 'center',
+    gap: spacing.sm,
+    minHeight: 44,
+    paddingHorizontal: spacing.md,
+    borderLeftWidth: 2,
+    borderLeftColor: 'transparent',
+  },
+  quickRowLabel: { ...typography.body, color: c.text },
+
   empty: {
     ...typography.body,
     color: c.textMuted,

src/components/TagSheet.tsx

@@ -0,0 +1,142 @@
+import React from 'react';
+import {
+  View, Text, StyleSheet, ScrollView, Pressable, Modal, Animated, Easing,
+} from 'react-native';
+import { useSafeAreaInsets } from 'react-native-safe-area-context';
+import { X, Check, Tag } from 'lucide-react-native';
+import { spacing, radius, typography, colors as tokenColors, type ThemePalette } from '../theme/tokens';
+import { useColors } from '../theme/colors';
+import { useSheetDrag } from '../lib/use-sheet-drag';
+import { keywordToken, type KeywordDef } from '../stores/keywords-store';
+import type { Email } from '../api/types';
+
+interface TagSheetProps {
+  visible: boolean;
+  onClose: () => void;
+  keywords: KeywordDef[];
+  /** The currently-selected emails, used to show which tags are already set. */
+  selectedEmails: Email[];
+  /** Toggle a keyword token on/off across the whole selection. */
+  onToggle: (token: string, on: boolean) => void;
+}
+
+export function TagSheet({ visible, onClose, keywords, selectedEmails, onToggle }: TagSheetProps) {
+  const c = useColors();
+  const styles = React.useMemo(() => makeStyles(c), [c]);
+  const insets = useSafeAreaInsets();
+  const slideY = React.useRef(new Animated.Value(500)).current;
+  const overlayOpacity = React.useRef(new Animated.Value(0)).current;
+  const dragHandlers = useSheetDrag({ slideY, closedY: 500, onClose });
+
+  React.useEffect(() => {
+    if (visible) {
+      Animated.parallel([
+        Animated.timing(slideY, { toValue: 0, duration: 220, easing: Easing.out(Easing.cubic), useNativeDriver: true }),
+        Animated.timing(overlayOpacity, { toValue: 1, duration: 220, useNativeDriver: true }),
+      ]).start();
+    } else {
+      Animated.parallel([
+        Animated.timing(slideY, { toValue: 500, duration: 180, easing: Easing.in(Easing.cubic), useNativeDriver: true }),
+        Animated.timing(overlayOpacity, { toValue: 0, duration: 180, useNativeDriver: true }),
+      ]).start();
+    }
+  }, [visible, slideY, overlayOpacity]);
+
+  // A tag counts as "applied" only when every selected email carries it; in
+  // that case tapping removes it, otherwise tapping adds it to all.
+  const allHaveToken = React.useCallback(
+    (token: string) =>
+      selectedEmails.length > 0 && selectedEmails.every((e) => !!e.keywords?.[token]),
+    [selectedEmails],
+  );
+
+  return (
+    <Modal visible={visible} transparent animationType="none" onRequestClose={onClose} statusBarTranslucent>
+      <Animated.View style={[styles.overlay, { opacity: overlayOpacity }]}>
+        <Pressable style={styles.overlayPress} onPress={onClose} />
+      </Animated.View>
+      <Animated.View
+        style={[
+          styles.sheet,
+          { paddingBottom: Math.max(insets.bottom, spacing.md), transform: [{ translateY: slideY }] },
+        ]}
+      >
+        <View {...dragHandlers}>
+          <View style={styles.handleHit}>
+            <View style={styles.handle} />
+          </View>
+          <View style={styles.header}>
+            <Text style={styles.title}>Tag {selectedEmails.length} selected</Text>
+            <Pressable onPress={onClose} hitSlop={8} style={styles.close}>
+              <X size={18} color={c.textSecondary} />
+            </Pressable>
+          </View>
+        </View>
+        <ScrollView>
+          {keywords.length === 0 ? (
+            <Text style={styles.empty}>No tags defined. Add tags in Settings.</Text>
+          ) : (
+            keywords.map((kw) => {
+              const token = keywordToken(kw.id);
+              const applied = allHaveToken(token);
+              const dot = tokenColors.tags[kw.color]?.dot ?? c.primary;
+              return (
+                <Pressable
+                  key={kw.id}
+                  onPress={() => onToggle(token, !applied)}
+                  style={({ pressed }) => [styles.row, pressed && styles.rowPressed]}
+                >
+                  <Tag size={16} color={dot} fill={dot} />
+                  <Text style={styles.rowLabel} numberOfLines={1}>{kw.label}</Text>
+                  {applied && <Check size={16} color={c.primary} />}
+                </Pressable>
+              );
+            })
+          )}
+        </ScrollView>
+      </Animated.View>
+    </Modal>
+  );
+}
+
+function makeStyles(c: ThemePalette) {
+  return StyleSheet.create({
+    overlay: { ...StyleSheet.absoluteFillObject, backgroundColor: 'rgba(0,0,0,0.5)' },
+    overlayPress: { flex: 1 },
+    sheet: {
+      position: 'absolute',
+      left: 0, right: 0, bottom: 0,
+      maxHeight: '75%',
+      backgroundColor: c.popover,
+      borderTopLeftRadius: radius.lg,
+      borderTopRightRadius: radius.lg,
+      borderTopWidth: 1,
+      borderColor: c.border,
+      paddingTop: spacing.sm,
+    },
+    handleHit: { alignItems: 'center', paddingTop: spacing.xs, paddingBottom: spacing.sm },
+    handle: { width: 36, height: 4, borderRadius: 2, backgroundColor: c.border },
+    header: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      justifyContent: 'space-between',
+      paddingHorizontal: spacing.lg,
+      paddingBottom: spacing.sm,
+      borderBottomWidth: 1,
+      borderBottomColor: c.border,
+    },
+    title: { ...typography.bodySemibold, color: c.text },
+    close: { width: 28, height: 28, alignItems: 'center', justifyContent: 'center', borderRadius: radius.xs },
+    empty: { ...typography.body, color: c.textMuted, padding: spacing.lg, textAlign: 'center' },
+    row: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      gap: spacing.sm,
+      paddingHorizontal: spacing.lg,
+      paddingVertical: spacing.sm + 2,
+      minHeight: 44,
+    },
+    rowPressed: { backgroundColor: c.surfaceHover },
+    rowLabel: { ...typography.body, color: c.text, flex: 1 },
+  });
+}

src/components/calendar/AgendaView.tsx

@@ -1,15 +1,16 @@
 import React from 'react';
 import { SectionList, StyleSheet, Text, View } from 'react-native';
-import { format, isSameDay, isToday, isTomorrow } from 'date-fns';
+import { addDays, format, isSameDay, isToday, isTomorrow, parseISO, startOfDay } from 'date-fns';
 import { CalendarDays } from 'lucide-react-native';
 import type { Calendar, CalendarEvent } from '../../api/types';
 import { spacing, typography, type ThemePalette } from '../../theme/tokens';
 import { useColors } from '../../theme/colors';
 import {
   buildEventDayIndex,
+  dayKey,
   eventsOnDayFromIndex,
-  getEventStartDate,
   type EventDayIndex,
+  type TimeFormat,
 } from '../../lib/calendar-utils';
 import { EventCard } from './EventCard';
 
@@ -19,6 +20,7 @@ interface AgendaViewProps {
   events: CalendarEvent[];
   calendars: Calendar[];
   eventsByDay?: EventDayIndex;
+  timeFormat?: TimeFormat;
   onSelectEvent?: (event: CalendarEvent) => void;
 }
 
@@ -40,6 +42,7 @@ export function AgendaView({
   events,
   calendars,
   eventsByDay,
+  timeFormat,
   onSelectEvent,
 }: AgendaViewProps) {
   const c = useColors();
@@ -50,32 +53,35 @@ export function AgendaView({
   );
 
   const sections = React.useMemo<DaySection[]>(() => {
-    const result: DaySection[] = [];
-    const start = new Date(fromDate);
-    start.setHours(0, 0, 0, 0);
+    // Mirror webmail's agenda (calendar-agenda-view.tsx): build a group for
+    // every day that actually has events, always include a "Today" anchor, and
+    // render them sorted ascending. Driving the list off the events (rather than
+    // a fixed day-counter) guarantees every upcoming loaded event appears - not
+    // just the ones inside a brittle N-day window from the anchor.
+    const anchor = startOfDay(fromDate);
+    const horizonEnd = addDays(anchor, daysAhead); // safety bound (exclusive)
 
-    for (let i = 0; i < daysAhead; i++) {
-      const day = new Date(start);
-      day.setDate(start.getDate() + i);
-      const dayEvents = eventsOnDayFromIndex(index, day).slice().sort((a, b) => {
-        // All-day events first within a day, then by start time, then title
-        // (stable tie-break) - mirrors the comparator the webmail uses for
-        // packing week segments and keeps multi-event days predictable.
-        if (a.showWithoutTime !== b.showWithoutTime) {
-          return a.showWithoutTime ? -1 : 1;
-        }
-        const diff = getEventStartDate(a).getTime() - getEventStartDate(b).getTime();
-        if (diff !== 0) return diff;
-        return (a.title || '').localeCompare(b.title || '');
-      });
-      if (dayEvents.length === 0 && !isToday(day)) continue;
-      result.push({
+    const days = new Map<string, Date>();
+    for (const key of index.keys()) {
+      const day = parseISO(key); // index keys are local yyyy-MM-dd
+      if (isNaN(day.getTime())) continue;
+      if (day < anchor || day >= horizonEnd) continue;
+      days.set(key, day);
+    }
+    // Always anchor "Today" so the view has a stable starting point even when
+    // the current day has no events (webmail injects the same anchor).
+    const today = startOfDay(new Date());
+    if (today >= anchor && today < horizonEnd) days.set(dayKey(today), today);
+
+    return [...days.values()]
+      .sort((a, b) => a.getTime() - b.getTime())
+      .map((day) => ({
         title: formatDayHeader(day),
         date: day,
-        data: dayEvents,
-      });
-    }
-    return result;
+        // Buckets are pre-sorted by buildEventDayIndex (all-day first, then by
+        // start, then title), so no extra sort is needed here.
+        data: eventsOnDayFromIndex(index, day),
+      }));
   }, [fromDate, daysAhead, index]);
 
   if (sections.length === 0) {
@@ -107,7 +113,7 @@ export function AgendaView({
       }}
       renderItem={({ item }) => (
         <View style={styles.itemWrap}>
-          <EventCard event={item} calendars={calendars} onPress={onSelectEvent} />
+          <EventCard event={item} calendars={calendars} timeFormat={timeFormat} onPress={onSelectEvent} />
         </View>
       )}
       renderSectionFooter={({ section }) =>

src/components/calendar/CalendarSidebarDrawer.tsx

@@ -11,12 +11,13 @@ import {
   View,
 } from 'react-native';
 import { SafeAreaView } from 'react-native-safe-area-context';
-import { Check, X } from 'lucide-react-native';
+import { Check, X, Upload, Rss, Shuffle, Star } from 'lucide-react-native';
 import type { Calendar } from '../../api/types';
 import { radius, spacing, typography, type ThemePalette } from '../../theme/tokens';
 import { useColors } from '../../theme/colors';
 import { useAnimDuration } from '../../theme/dynamic';
-import { getCalendarColor } from '../../lib/calendar-utils';
+import { CALENDAR_COLOR_PALETTE, getCalendarColor } from '../../lib/calendar-utils';
+import { BIRTHDAY_CALENDAR_ID } from '../../lib/birthday-calendar';
 
 interface CalendarSidebarDrawerProps {
   visible: boolean;
@@ -24,6 +25,13 @@ interface CalendarSidebarDrawerProps {
   hiddenCalendarIds: string[];
   onToggle: (id: string) => void;
   onClose: () => void;
+  onImport?: () => void;
+  onManageSubscriptions?: () => void;
+  // Long-press actions. Set-default applies to the user's own calendars;
+  // color change/reset applies to shared calendars (per-viewer recolor).
+  onSetDefault?: (calendar: Calendar) => void;
+  onSetColor?: (calendar: Calendar, color: string) => void;
+  onResetColor?: (calendar: Calendar) => void;
 }
 
 export function CalendarSidebarDrawer({
@@ -32,6 +40,11 @@ export function CalendarSidebarDrawer({
   hiddenCalendarIds,
   onToggle,
   onClose,
+  onImport,
+  onManageSubscriptions,
+  onSetDefault,
+  onSetColor,
+  onResetColor,
 }: CalendarSidebarDrawerProps) {
   const c = useColors();
   const styles = React.useMemo(() => makeStyles(c), [c]);
@@ -39,6 +52,7 @@ export function CalendarSidebarDrawer({
   const overlayOpacity = React.useRef(new Animated.Value(0)).current;
   const openDuration = useAnimDuration(240);
   const closeDuration = useAnimDuration(200);
+  const [expandedId, setExpandedId] = React.useState<string | null>(null);
 
   React.useEffect(() => {
     if (visible) {
@@ -56,6 +70,7 @@ export function CalendarSidebarDrawer({
         }),
       ]).start();
     } else {
+      setExpandedId(null);
       Animated.parallel([
         Animated.timing(slideX, {
           toValue: -Dimensions.get('window').width,
@@ -74,8 +89,23 @@ export function CalendarSidebarDrawer({
 
   const hiddenSet = React.useMemo(() => new Set(hiddenCalendarIds), [hiddenCalendarIds]);
 
-  const myCalendars = calendars.filter((c) => !c.myRights || c.myRights.mayWrite !== false);
-  const subscribed = calendars.filter((c) => c.myRights && c.myRights.mayWrite === false);
+  const sharedCalendars = calendars.filter((cal) => cal.isShared);
+  const myCalendars = calendars.filter(
+    (cal) => !cal.isShared && (!cal.myRights || cal.myRights.mayWrite !== false),
+  );
+  const subscribed = calendars.filter(
+    (cal) => !cal.isShared && cal.myRights && cal.myRights.mayWrite === false,
+  );
+
+  const sectionProps = {
+    hiddenSet,
+    onToggle,
+    expandedId,
+    onExpand: setExpandedId,
+    onSetDefault,
+    onSetColor,
+    onResetColor,
+  };
 
   return (
     <Modal
@@ -106,21 +136,38 @@ export function CalendarSidebarDrawer({
             )}
 
             {myCalendars.length > 0 && (
-              <Section
-                title="My calendars"
-                calendars={myCalendars}
-                hiddenSet={hiddenSet}
-                onToggle={onToggle}
-              />
+              <Section title="My calendars" calendars={myCalendars} {...sectionProps} />
+            )}
+
+            {sharedCalendars.length > 0 && (
+              <Section title="Shared with me" calendars={sharedCalendars} {...sectionProps} />
             )}
 
             {subscribed.length > 0 && (
-              <Section
-                title="Subscribed"
-                calendars={subscribed}
-                hiddenSet={hiddenSet}
-                onToggle={onToggle}
-              />
+              <Section title="Subscribed" calendars={subscribed} {...sectionProps} />
+            )}
+
+            {(onImport || onManageSubscriptions) && (
+              <View style={styles.actionsSection}>
+                {onManageSubscriptions && (
+                  <Pressable
+                    onPress={onManageSubscriptions}
+                    style={({ pressed }) => [styles.actionRow, pressed && styles.rowPressed]}
+                  >
+                    <Rss size={18} color={c.textSecondary} />
+                    <Text style={styles.actionText}>Subscriptions</Text>
+                  </Pressable>
+                )}
+                {onImport && (
+                  <Pressable
+                    onPress={onImport}
+                    style={({ pressed }) => [styles.actionRow, pressed && styles.rowPressed]}
+                  >
+                    <Upload size={18} color={c.textSecondary} />
+                    <Text style={styles.actionText}>Import from file</Text>
+                  </Pressable>
+                )}
+              </View>
             )}
           </ScrollView>
         </SafeAreaView>
@@ -134,11 +181,21 @@ function Section({
   calendars,
   hiddenSet,
   onToggle,
+  expandedId,
+  onExpand,
+  onSetDefault,
+  onSetColor,
+  onResetColor,
 }: {
   title: string;
   calendars: Calendar[];
   hiddenSet: Set<string>;
   onToggle: (id: string) => void;
+  expandedId: string | null;
+  onExpand: (id: string | null) => void;
+  onSetDefault?: (calendar: Calendar) => void;
+  onSetColor?: (calendar: Calendar, color: string) => void;
+  onResetColor?: (calendar: Calendar) => void;
 }) {
   const c = useColors();
   const styles = React.useMemo(() => makeStyles(c), [c]);
@@ -147,30 +204,85 @@ function Section({
       <Text style={styles.sectionTitle}>{title}</Text>
       {calendars.map((cal) => {
         const visible = !hiddenSet.has(cal.id);
+        const isBirthday = cal.id === BIRTHDAY_CALENDAR_ID;
+        const canSetDefault = !!onSetDefault && !cal.isShared && !isBirthday && !cal.isDefault;
+        const canRecolor = !!onSetColor && !!cal.isShared;
+        const hasActions = canSetDefault || canRecolor;
+        const expanded = expandedId === cal.id && hasActions;
         return (
-          <Pressable
-            key={cal.id}
-            onPress={() => onToggle(cal.id)}
-            style={({ pressed }) => [
-              styles.row,
-              pressed && styles.rowPressed,
-            ]}
-          >
-            <View
-              style={[
-                styles.swatch,
-                {
-                  backgroundColor: visible ? getCalendarColor(cal) : 'transparent',
-                  borderColor: getCalendarColor(cal),
-                },
+          <View key={cal.id}>
+            <Pressable
+              onPress={() => onToggle(cal.id)}
+              onLongPress={hasActions ? () => onExpand(expanded ? null : cal.id) : undefined}
+              style={({ pressed }) => [
+                styles.row,
+                pressed && styles.rowPressed,
               ]}
             >
-              {visible && <Check size={12} color={c.textInverse} />}
-            </View>
-            <Text style={[styles.rowName, !visible && styles.rowNameMuted]}>
-              {cal.name}
-            </Text>
-          </Pressable>
+              <View
+                style={[
+                  styles.swatch,
+                  {
+                    backgroundColor: visible ? getCalendarColor(cal) : 'transparent',
+                    borderColor: getCalendarColor(cal),
+                  },
+                ]}
+              >
+                {visible && <Check size={12} color={c.textInverse} />}
+              </View>
+              <Text style={[styles.rowName, !visible && styles.rowNameMuted]} numberOfLines={1}>
+                {cal.name}
+              </Text>
+              {cal.isDefault && !cal.isShared && (
+                <Star size={14} color={c.textMuted} fill={c.textMuted} />
+              )}
+            </Pressable>
+
+            {expanded && (
+              <View style={styles.actionsPanel}>
+                {canSetDefault && (
+                  <Pressable
+                    onPress={() => { onExpand(null); onSetDefault!(cal); }}
+                    style={({ pressed }) => [styles.panelRow, pressed && styles.rowPressed]}
+                  >
+                    <Star size={16} color={c.textSecondary} />
+                    <Text style={styles.panelRowText}>Set as default calendar</Text>
+                  </Pressable>
+                )}
+                {canRecolor && (
+                  <>
+                    <View style={styles.paletteRow}>
+                      {CALENDAR_COLOR_PALETTE.map((color) => {
+                        const active = cal.color?.toLowerCase() === color.toLowerCase();
+                        return (
+                          <Pressable
+                            key={color}
+                            onPress={() => { onExpand(null); onSetColor!(cal, color); }}
+                            style={[
+                              styles.paletteSwatch,
+                              { backgroundColor: color },
+                              active && styles.paletteSwatchActive,
+                            ]}
+                          >
+                            {active && <Check size={12} color={c.textInverse} />}
+                          </Pressable>
+                        );
+                      })}
+                    </View>
+                    {!!onResetColor && cal.colorIsLocalOverride && (
+                      <Pressable
+                        onPress={() => { onExpand(null); onResetColor(cal); }}
+                        style={({ pressed }) => [styles.panelRow, pressed && styles.rowPressed]}
+                      >
+                        <Shuffle size={16} color={c.textSecondary} />
+                        <Text style={styles.panelRowText}>Random color</Text>
+                      </Pressable>
+                    )}
+                  </>
+                )}
+              </View>
+            )}
+          </View>
         );
       })}
     </View>
@@ -251,5 +363,58 @@ function makeStyles(c: ThemePalette) {
   },
   rowName: { flex: 1, ...typography.body, color: c.text },
   rowNameMuted: { color: c.textMuted },
+
+  actionsPanel: {
+    marginHorizontal: spacing.lg,
+    marginBottom: spacing.sm,
+    borderWidth: 1,
+    borderColor: c.border,
+    borderRadius: radius.sm,
+    backgroundColor: c.surface,
+    overflow: 'hidden',
+  },
+  panelRow: {
+    flexDirection: 'row',
+    alignItems: 'center',
+    gap: spacing.sm,
+    paddingHorizontal: spacing.md,
+    paddingVertical: spacing.sm,
+    minHeight: 40,
+  },
+  panelRowText: { ...typography.body, color: c.text },
+  paletteRow: {
+    flexDirection: 'row',
+    flexWrap: 'wrap',
+    gap: spacing.sm,
+    paddingHorizontal: spacing.md,
+    paddingVertical: spacing.sm,
+  },
+  paletteSwatch: {
+    width: 24,
+    height: 24,
+    borderRadius: radius.full,
+    alignItems: 'center',
+    justifyContent: 'center',
+  },
+  paletteSwatchActive: {
+    borderWidth: 2,
+    borderColor: c.text,
+  },
+
+  actionsSection: {
+    marginTop: spacing.lg,
+    paddingTop: spacing.sm,
+    borderTopWidth: 1,
+    borderTopColor: c.border,
+  },
+  actionRow: {
+    flexDirection: 'row',
+    alignItems: 'center',
+    gap: spacing.md,
+    paddingHorizontal: spacing.lg,
+    paddingVertical: spacing.sm,
+    minHeight: 44,
+  },
+  actionText: { ...typography.body, color: c.text },
   });
 }

src/components/calendar/EventCard.tsx

@@ -5,11 +5,17 @@ import { format } from 'date-fns';
 import type { Calendar, CalendarEvent } from '../../api/types';
 import { radius, spacing, typography, type ThemePalette } from '../../theme/tokens';
 import { useColors } from '../../theme/colors';
-import { eventTimeRange, getEventColor } from '../../lib/calendar-utils';
+import {
+  eventTimeRange,
+  getEventColor,
+  timePattern,
+  type TimeFormat,
+} from '../../lib/calendar-utils';
 
 interface EventCardProps {
   event: CalendarEvent;
   calendars: Calendar[];
+  timeFormat?: TimeFormat;
   onPress?: (event: CalendarEvent) => void;
   onLongPress?: (event: CalendarEvent) => void;
 }
@@ -18,17 +24,18 @@ function participantCount(event: CalendarEvent): number {
   return event.participants ? Object.keys(event.participants).length : 0;
 }
 
-function formatTimeRange(event: CalendarEvent): string {
+function formatTimeRange(event: CalendarEvent, timeFormat?: TimeFormat): string {
   const { start, end, allDay } = eventTimeRange(event);
   if (allDay) return 'All day';
-  return `${format(start, 'HH:mm')} – ${format(end, 'HH:mm')}`;
+  const fmt = timePattern(timeFormat);
+  return `${format(start, fmt)} – ${format(end, fmt)}`;
 }
 
-export function EventCard({ event, calendars, onPress, onLongPress }: EventCardProps) {
+export function EventCard({ event, calendars, timeFormat, onPress, onLongPress }: EventCardProps) {
   const c = useColors();
   const styles = React.useMemo(() => makeStyles(c), [c]);
   const color = getEventColor(event, calendars);
-  const time = formatTimeRange(event);
+  const time = formatTimeRange(event, timeFormat);
   const count = participantCount(event);
 
   return (
@@ -79,7 +86,8 @@ function makeStyles(c: ThemePalette) {
   card: {
     flexDirection: 'row',
     backgroundColor: c.card,
-    borderRadius: radius.lg,
+    borderTopRightRadius: radius.lg,
+    borderBottomRightRadius: radius.lg,
     marginBottom: spacing.sm,
     overflow: 'hidden',
     borderWidth: 1,

src/components/calendar/EventDetailSheet.tsx

@@ -3,6 +3,7 @@ import {
   Animated,
   Dimensions,
   Easing,
+  Linking,
   Modal,
   Pressable,
   ScrollView,
@@ -15,13 +16,16 @@ import {
   AlignLeft,
   Bell,
   Calendar as CalendarIcon,
+  Check,
   Clock,
   Copy,
+  HelpCircle,
   MapPin,
   Pencil,
   Repeat,
   Trash2,
   Users,
+  Video,
   X,
 } from 'lucide-react-native';
 import { format } from 'date-fns';
@@ -32,19 +36,31 @@ import {
   eventTimeRange,
   getEventColor,
   getPrimaryCalendarId,
+  timePattern,
+  type TimeFormat,
 } from '../../lib/calendar-utils';
+import { alertsToReminders, formatReminder } from '../../lib/calendar-alerts';
+import {
+  findParticipantByEmail,
+  isOrganizerParticipant,
+} from '../../lib/calendar-invitation';
+import { useAccountStore } from '../../stores/account-store';
 import { useSheetDrag } from '../../lib/use-sheet-drag';
 
+type RsvpStatus = 'accepted' | 'declined' | 'tentative';
+
 interface EventDetailSheetProps {
   event: CalendarEvent | null;
   calendars: Calendar[];
+  timeFormat?: TimeFormat;
   onClose: () => void;
   onEdit?: (event: CalendarEvent) => void;
   onDelete?: (event: CalendarEvent) => void;
   onDuplicate?: (event: CalendarEvent) => void;
+  onRsvp?: (event: CalendarEvent, participantId: string, status: RsvpStatus) => void | Promise<void>;
 }
 
-function formatRange(event: CalendarEvent): string {
+function formatRange(event: CalendarEvent, timeFormat?: TimeFormat): string {
   const { start, end, allDay } = eventTimeRange(event);
   if (allDay) {
     if (
@@ -56,14 +72,15 @@ function formatRange(event: CalendarEvent): string {
     }
     return `${format(start, 'MMM d')} – ${format(end, 'MMM d, yyyy')}`;
   }
+  const t = timePattern(timeFormat);
   const sameDay =
     start.getFullYear() === end.getFullYear() &&
     start.getMonth() === end.getMonth() &&
     start.getDate() === end.getDate();
   if (sameDay) {
-    return `${format(start, 'EEE, MMM d')} · ${format(start, 'HH:mm')} – ${format(end, 'HH:mm')}`;
+    return `${format(start, 'EEE, MMM d')} · ${format(start, t)} – ${format(end, t)}`;
   }
-  return `${format(start, 'MMM d, HH:mm')} – ${format(end, 'MMM d, HH:mm')}`;
+  return `${format(start, `MMM d, ${t}`)} – ${format(end, `MMM d, ${t}`)}`;
 }
 
 function recurrenceLabel(event: CalendarEvent): string | null {
@@ -84,31 +101,19 @@ function recurrenceLabel(event: CalendarEvent): string | null {
   return label;
 }
 
-function alertLabel(event: CalendarEvent): string | null {
-  if (!event.alerts) return null;
-  const first = Object.values(event.alerts)[0];
-  if (!first) return null;
-  const offset = first.trigger?.offset;
-  if (!offset) return null;
-  if (offset === 'PT0S' || offset === '-PT0S') return 'At time of event';
-  const min = offset.match(/-?PT(\d+)M$/);
-  if (min) return `${min[1]} minutes before`;
-  const hr = offset.match(/-?PT(\d+)H$/);
-  if (hr) return `${hr[1]} hours before`;
-  const day = offset.match(/-?P(\d+)D/);
-  if (day) return `${day[1]} days before`;
-  return null;
-}
-
 export function EventDetailSheet({
   event,
   calendars,
+  timeFormat,
   onClose,
   onEdit,
   onDelete,
   onDuplicate,
+  onRsvp,
 }: EventDetailSheetProps) {
   const c = useColors();
+  const activeEmail = useAccountStore((s) => s.getActiveAccount()?.email ?? null);
+  const [rsvpBusy, setRsvpBusy] = React.useState(false);
   const styles = React.useMemo(() => makeStyles(c), [c]);
   const slideY = React.useRef(new Animated.Value(Dimensions.get('window').height)).current;
   const overlayOpacity = React.useRef(new Animated.Value(0)).current;
@@ -156,10 +161,28 @@ export function EventDetailSheet({
   const color = getEventColor(event, calendars);
   const calendarId = getPrimaryCalendarId(event);
   const calendar = calendars.find((c) => c.id === calendarId);
-  const range = formatRange(event);
+  const range = formatRange(event, timeFormat);
   const recurrence = recurrenceLabel(event);
-  const alert = alertLabel(event);
+  const reminders = alertsToReminders(event.alerts);
   const participants = event.participants ? Object.values(event.participants) : [];
+  const location = event.locations ? Object.values(event.locations)[0]?.name : undefined;
+  const videoUri = event.virtualLocations ? Object.values(event.virtualLocations)[0]?.uri : undefined;
+
+  // Can the signed-in user RSVP? Only when they appear as a non-organizer
+  // participant and the caller wired an onRsvp handler.
+  const me = activeEmail ? findParticipantByEmail(event, [activeEmail]) : null;
+  const canRsvp = Boolean(onRsvp && me && !isOrganizerParticipant(me.participant));
+  const myStatus = me?.participant.participationStatus;
+
+  const doRsvp = async (status: RsvpStatus) => {
+    if (!onRsvp || !me || rsvpBusy) return;
+    setRsvpBusy(true);
+    try {
+      await onRsvp(event, me.id, status);
+    } finally {
+      setRsvpBusy(false);
+    }
+  };
 
   return (
     <Modal
@@ -198,6 +221,22 @@ export function EventDetailSheet({
             showsVerticalScrollIndicator={false}
           >
             <DetailRow icon={<Clock size={16} color={c.textMuted} />} text={range} />
+            {location ? (
+              <DetailRow icon={<MapPin size={16} color={c.textMuted} />} text={location} />
+            ) : null}
+            {videoUri ? (
+              <View style={styles.detailRow}>
+                <View style={styles.detailIcon}>
+                  <Video size={16} color={c.textMuted} />
+                </View>
+                <Pressable
+                  style={styles.joinBtn}
+                  onPress={() => { void Linking.openURL(videoUri); }}
+                >
+                  <Text style={styles.joinBtnText}>Join video call</Text>
+                </Pressable>
+              </View>
+            ) : null}
             {event.description ? (
               <DetailRow
                 icon={<AlignLeft size={16} color={c.textMuted} />}
@@ -211,10 +250,10 @@ export function EventDetailSheet({
                 text={recurrence}
               />
             )}
-            {alert && (
+            {reminders.length > 0 && (
               <DetailRow
                 icon={<Bell size={16} color={c.textMuted} />}
-                text={alert}
+                text={reminders.map((r) => formatReminder(r.minutesBefore)).join(', ')}
               />
             )}
             {calendar && (
@@ -224,6 +263,38 @@ export function EventDetailSheet({
               />
             )}
 
+            {canRsvp && (
+              <View style={styles.rsvpBlock}>
+                <Text style={styles.rsvpPrompt}>Going?</Text>
+                <View style={styles.rsvpButtons}>
+                  <RsvpButton
+                    label="Yes"
+                    icon={<Check size={16} color={myStatus === 'accepted' ? c.textInverse : c.success} />}
+                    active={myStatus === 'accepted'}
+                    activeColor={c.success}
+                    disabled={rsvpBusy}
+                    onPress={() => doRsvp('accepted')}
+                  />
+                  <RsvpButton
+                    label="Maybe"
+                    icon={<HelpCircle size={16} color={myStatus === 'tentative' ? c.textInverse : c.warning} />}
+                    active={myStatus === 'tentative'}
+                    activeColor={c.warning}
+                    disabled={rsvpBusy}
+                    onPress={() => doRsvp('tentative')}
+                  />
+                  <RsvpButton
+                    label="No"
+                    icon={<X size={16} color={myStatus === 'declined' ? c.textInverse : c.error} />}
+                    active={myStatus === 'declined'}
+                    activeColor={c.error}
+                    disabled={rsvpBusy}
+                    onPress={() => doRsvp('declined')}
+                  />
+                </View>
+              </View>
+            )}
+
             {participants.length > 0 && (
               <View style={styles.participantsBlock}>
                 <View style={styles.participantsHeader}>
@@ -334,6 +405,39 @@ function ActionButton({
   );
 }
 
+function RsvpButton({
+  label,
+  icon,
+  active,
+  activeColor,
+  disabled,
+  onPress,
+}: {
+  label: string;
+  icon: React.ReactNode;
+  active: boolean;
+  activeColor: string;
+  disabled?: boolean;
+  onPress: () => void;
+}) {
+  const c = useColors();
+  const styles = React.useMemo(() => makeStyles(c), [c]);
+  return (
+    <Pressable
+      onPress={onPress}
+      disabled={disabled}
+      style={[
+        styles.rsvpBtn,
+        active && { backgroundColor: activeColor, borderColor: activeColor },
+        disabled && { opacity: 0.5 },
+      ]}
+    >
+      {icon}
+      <Text style={[styles.rsvpBtnText, active && { color: c.textInverse }]}>{label}</Text>
+    </Pressable>
+  );
+}
+
 function statusColor(c: ThemePalette, status?: string): string {
   switch (status) {
     case 'accepted':
@@ -417,6 +521,33 @@ function makeStyles(c: ThemePalette) {
   detailIcon: { width: 16, paddingTop: 2 },
   detailText: { flex: 1, ...typography.body, color: c.text },
 
+  joinBtn: {
+    flex: 1,
+    alignSelf: 'flex-start',
+    paddingHorizontal: spacing.md,
+    paddingVertical: spacing.xs,
+    borderRadius: radius.sm,
+    backgroundColor: c.primaryBg,
+  },
+  joinBtnText: { ...typography.bodyMedium, color: c.primary },
+
+  rsvpBlock: { gap: spacing.sm, marginTop: spacing.xs },
+  rsvpPrompt: { ...typography.bodyMedium, color: c.text },
+  rsvpButtons: { flexDirection: 'row', gap: spacing.sm },
+  rsvpBtn: {
+    flex: 1,
+    flexDirection: 'row',
+    alignItems: 'center',
+    justifyContent: 'center',
+    gap: spacing.xs,
+    paddingVertical: spacing.sm,
+    borderRadius: radius.sm,
+    borderWidth: 1,
+    borderColor: c.border,
+    backgroundColor: c.surface,
+  },
+  rsvpBtnText: { ...typography.caption, color: c.text },
+
   participantsBlock: {
     marginTop: spacing.sm,
     gap: spacing.xs,

src/components/calendar/EventModal.tsx

@@ -17,13 +17,23 @@ import {
   Calendar as CalendarIcon,
   Clock,
   MapPin,
+  Video,
   Repeat,
   Bell,
+  Plus,
   Users,
   Trash2,
+  AlignLeft,
 } from 'lucide-react-native';
 import { addHours, addMinutes, format } from 'date-fns';
-import type { Calendar, CalendarEvent, Participant } from '../../api/types';
+import type {
+  Calendar,
+  CalendarEvent,
+  Participant,
+  EventLocation,
+  RecurrenceRule,
+  VirtualLocation,
+} from '../../api/types';
 import { radius, spacing, typography, type ThemePalette } from '../../theme/tokens';
 import { useColors } from '../../theme/colors';
 import {
@@ -33,11 +43,19 @@ import {
   getEventStartDate,
   getPrimaryCalendarId,
 } from '../../lib/calendar-utils';
+import {
+  alertsToReminders,
+  remindersToAlerts,
+  formatReminder,
+  REMINDER_PRESETS,
+  type Reminder,
+} from '../../lib/calendar-alerts';
+import { buildRecurrenceSummary, isSimpleRecurrenceRule } from '../../lib/recurrence';
 import { Button } from '..';
 import { ParticipantInput } from './ParticipantInput';
+import { RecurrenceEditor } from './RecurrenceEditor';
 
-type RecurrenceOption = 'none' | 'daily' | 'weekly' | 'monthly' | 'yearly';
-type AlertOption = 'none' | 'at_time' | '5' | '15' | '30' | '60' | '1440';
+type RecurrenceOption = 'none' | 'daily' | 'weekly' | 'monthly' | 'yearly' | 'custom';
 
 const RECURRENCE_OPTIONS: { value: RecurrenceOption; label: string }[] = [
   { value: 'none', label: 'Does not repeat' },
@@ -45,16 +63,7 @@ const RECURRENCE_OPTIONS: { value: RecurrenceOption; label: string }[] = [
   { value: 'weekly', label: 'Weekly' },
   { value: 'monthly', label: 'Monthly' },
   { value: 'yearly', label: 'Yearly' },
-];
-
-const ALERT_OPTIONS: { value: AlertOption; label: string }[] = [
-  { value: 'none', label: 'No reminder' },
-  { value: 'at_time', label: 'At time of event' },
-  { value: '5', label: '5 minutes before' },
-  { value: '15', label: '15 minutes before' },
-  { value: '30', label: '30 minutes before' },
-  { value: '60', label: '1 hour before' },
-  { value: '1440', label: '1 day before' },
+  { value: 'custom', label: 'Custom…' },
 ];
 
 interface EventModalProps {
@@ -94,46 +103,41 @@ function buildDuration(start: Date, end: Date): string {
 function detectRecurrence(event: CalendarEvent | null | undefined): RecurrenceOption {
   const rule = event?.recurrenceRules?.[0];
   if (!rule) return 'none';
-  const f = rule.frequency.toLowerCase();
-  if (f === 'daily' || f === 'weekly' || f === 'monthly' || f === 'yearly') {
-    return f as RecurrenceOption;
+  if (isSimpleRecurrenceRule(rule)) {
+    const f = rule.frequency.toLowerCase();
+    if (f === 'daily' || f === 'weekly' || f === 'monthly' || f === 'yearly') {
+      return f as RecurrenceOption;
+    }
   }
-  return 'none';
+  // Anything the simple presets can't represent is edited via the custom
+  // recurrence editor.
+  return 'custom';
 }
 
-function detectAlert(event: CalendarEvent | null | undefined): AlertOption {
-  const alerts = event?.alerts;
-  if (!alerts) return 'none';
-  const first = Object.values(alerts)[0];
-  if (!first) return 'none';
-  const offset = first.trigger?.offset;
-  if (!offset) return 'none';
-  if (offset === 'PT0S' || offset === '-PT0S') return 'at_time';
-  const min = offset.match(/-?PT(\d+)M$/);
-  if (min) {
-    const v = min[1];
-    if (v === '5' || v === '15' || v === '30') return v as AlertOption;
-  }
-  const hr = offset.match(/-?PT(\d+)H$/);
-  if (hr && hr[1] === '1') return '60';
-  const day = offset.match(/-?P(\d+)D/);
-  if (day && day[1] === '1') return '1440';
-  return 'none';
+function detectLocation(event: CalendarEvent | null | undefined): string {
+  const locations = event?.locations;
+  if (!locations) return '';
+  const first = Object.values(locations)[0];
+  return first?.name || '';
 }
 
-function alertFromOption(opt: AlertOption): CalendarEvent['alerts'] | undefined {
-  if (opt === 'none') return undefined;
-  let offset = '-PT0M';
-  if (opt === 'at_time') offset = 'PT0S';
-  else if (opt === '60') offset = '-PT1H';
-  else if (opt === '1440') offset = '-P1D';
-  else offset = `-PT${opt}M`;
-  return {
-    'a-1': {
-      trigger: { '@type': 'OffsetTrigger', offset },
-      action: 'display',
-    },
-  };
+function detectVideoUrl(event: CalendarEvent | null | undefined): string {
+  const v = event?.virtualLocations;
+  if (!v) return '';
+  const first = Object.values(v)[0];
+  return first?.uri || '';
+}
+
+function buildLocations(name: string): Record<string, EventLocation> | undefined {
+  const trimmed = name.trim();
+  if (!trimmed) return undefined;
+  return { 'loc-1': { '@type': 'Location', name: trimmed } };
+}
+
+function buildVirtualLocations(uri: string): Record<string, VirtualLocation> | undefined {
+  const trimmed = uri.trim();
+  if (!trimmed) return undefined;
+  return { 'vloc-1': { '@type': 'VirtualLocation', name: 'Video call', uri: trimmed } };
 }
 
 function recurrenceFromOption(opt: RecurrenceOption): CalendarEvent['recurrenceRules'] | undefined {
@@ -160,12 +164,23 @@ export function EventModal({
   const [allDay, setAllDay] = React.useState(false);
   const [start, setStart] = React.useState<Date>(() => nextHalfHour(defaultDate ?? new Date()));
   const [end, setEnd] = React.useState<Date>(() => addHours(nextHalfHour(defaultDate ?? new Date()), 1));
-  const [calendarId, setCalendarId] = React.useState<string>(defaultCalendarId || calendars[0]?.id || '');
+  // New events land in the explicitly requested calendar, else the account's
+  // default calendar, else the first one.
+  const fallbackCalendarId =
+    defaultCalendarId
+    || calendars.find((cal) => cal.isDefault && !cal.isShared)?.id
+    || calendars[0]?.id
+    || '';
+  const [calendarId, setCalendarId] = React.useState<string>(fallbackCalendarId);
   const [participants, setParticipants] = React.useState<Record<string, Participant>>({});
   const [recurrence, setRecurrence] = React.useState<RecurrenceOption>('none');
-  const [alert, setAlert] = React.useState<AlertOption>('none');
+  const [customRule, setCustomRule] = React.useState<RecurrenceRule | null>(null);
+  const [recurrenceEditorOpen, setRecurrenceEditorOpen] = React.useState(false);
+  const [reminders, setReminders] = React.useState<Reminder[]>([]);
+  const [location, setLocation] = React.useState('');
+  const [videoUrl, setVideoUrl] = React.useState('');
   const [recurrenceOpen, setRecurrenceOpen] = React.useState(false);
-  const [alertOpen, setAlertOpen] = React.useState(false);
+  const [reminderPickerOpen, setReminderPickerOpen] = React.useState(false);
   const [calendarOpen, setCalendarOpen] = React.useState(false);
   const [showStartDate, setShowStartDate] = React.useState(false);
   const [showStartTime, setShowStartTime] = React.useState(false);
@@ -183,8 +198,13 @@ export function EventModal({
       setEnd(getEventEndDate(event));
       setCalendarId(getPrimaryCalendarId(event) || calendars[0]?.id || '');
       setParticipants(event.participants || {});
-      setRecurrence(detectRecurrence(event));
-      setAlert(detectAlert(event));
+      const detected = detectRecurrence(event);
+      setRecurrence(detected);
+      setCustomRule(detected === 'custom' ? event.recurrenceRules?.[0] ?? null : null);
+      setRecurrenceEditorOpen(false);
+      setReminders(alertsToReminders(event.alerts));
+      setLocation(detectLocation(event));
+      setVideoUrl(detectVideoUrl(event));
     } else {
       const d = defaultDate ? nextHalfHour(defaultDate) : nextHalfHour(new Date());
       setTitle('');
@@ -192,10 +212,19 @@ export function EventModal({
       setAllDay(false);
       setStart(d);
       setEnd(addHours(d, 1));
-      setCalendarId(defaultCalendarId || calendars[0]?.id || '');
+      setCalendarId(
+        defaultCalendarId
+        || calendars.find((cal) => cal.isDefault && !cal.isShared)?.id
+        || calendars[0]?.id
+        || '',
+      );
       setParticipants({});
       setRecurrence('none');
-      setAlert('none');
+      setCustomRule(null);
+      setRecurrenceEditorOpen(false);
+      setReminders([]);
+      setLocation('');
+      setVideoUrl('');
     }
   }, [visible, event, defaultDate, defaultCalendarId, calendars]);
 
@@ -239,8 +268,16 @@ export function EventModal({
           : format(start, "yyyy-MM-dd'T'HH:mm:ss"),
         duration: allDay ? buildAllDayDuration(start, end) : buildDuration(start, end),
         participants: Object.keys(participants).length > 0 ? participants : undefined,
-        recurrenceRules: recurrenceFromOption(recurrence),
-        alerts: alertFromOption(alert),
+        recurrenceRules:
+          recurrence === 'custom'
+            ? customRule
+              ? [customRule]
+              : undefined
+            : recurrenceFromOption(recurrence),
+        alerts: remindersToAlerts(reminders),
+        useDefaultAlerts: reminders.length > 0 ? false : undefined,
+        locations: buildLocations(location),
+        virtualLocations: buildVirtualLocations(videoUrl),
       };
       await onSave(data, calendarId);
       onClose();
@@ -254,8 +291,25 @@ export function EventModal({
   };
 
   const selectedCalendar = calendars.find((c) => c.id === calendarId);
-  const recurrenceLabel = RECURRENCE_OPTIONS.find((o) => o.value === recurrence)?.label || 'None';
-  const alertLabel = ALERT_OPTIONS.find((o) => o.value === alert)?.label || 'None';
+  const recurrenceLabel =
+    recurrence === 'custom'
+      ? (customRule && buildRecurrenceSummary(customRule)) || 'Custom'
+      : RECURRENCE_OPTIONS.find((o) => o.value === recurrence)?.label || 'None';
+
+  const addReminder = (minutesBefore: number) => {
+    setReminderPickerOpen(false);
+    setReminders((prev) =>
+      prev.some((r) => r.minutesBefore === minutesBefore)
+        ? prev
+        : [...prev, { minutesBefore }].sort((a, b) => b.minutesBefore - a.minutesBefore),
+    );
+  };
+  const removeReminder = (minutesBefore: number) => {
+    setReminders((prev) => prev.filter((r) => r.minutesBefore !== minutesBefore));
+  };
+  const availablePresets = REMINDER_PRESETS.filter(
+    (p) => !reminders.some((r) => r.minutesBefore === p),
+  );
 
   return (
     <Modal
@@ -412,8 +466,14 @@ export function EventModal({
                       opt.value === recurrence && styles.popoverRowActive,
                     ]}
                     onPress={() => {
-                      setRecurrence(opt.value);
                       setRecurrenceOpen(false);
+                      if (opt.value === 'custom') {
+                        setRecurrenceEditorOpen(true);
+                        return;
+                      }
+                      setRecurrence(opt.value);
+                      setCustomRule(null);
+                      setRecurrenceEditorOpen(false);
                     }}
                   >
                     <Text style={styles.popoverRowText}>{opt.label}</Text>
@@ -421,44 +481,99 @@ export function EventModal({
                 ))}
               </View>
             )}
+            {recurrenceEditorOpen && (
+              <RecurrenceEditor
+                rule={customRule}
+                eventStart={start}
+                onSave={(rule) => {
+                  setCustomRule(rule);
+                  setRecurrence('custom');
+                  setRecurrenceEditorOpen(false);
+                }}
+                onCancel={() => setRecurrenceEditorOpen(false)}
+              />
+            )}
+            {recurrence === 'custom' && customRule && !recurrenceEditorOpen && (
+              <Pressable style={styles.addRow} onPress={() => setRecurrenceEditorOpen(true)}>
+                <Text style={styles.addRowText}>Edit custom recurrence</Text>
+              </Pressable>
+            )}
+          </Section>
+
+          <Section icon={<Bell size={16} color={c.textMuted} />} label="Reminders">
+            {reminders.length > 0 && (
+              <View style={{ gap: spacing.xs }}>
+                {reminders.map((r) => (
+                  <View key={r.minutesBefore} style={styles.reminderRow}>
+                    <Text style={styles.fieldText}>{formatReminder(r.minutesBefore)}</Text>
+                    <Pressable
+                      onPress={() => removeReminder(r.minutesBefore)}
+                      hitSlop={8}
+                      style={styles.reminderRemove}
+                    >
+                      <X size={16} color={c.textMuted} />
+                    </Pressable>
+                  </View>
+                ))}
+              </View>
+            )}
+            {availablePresets.length > 0 && (
+              <Pressable
+                style={styles.addRow}
+                onPress={() => setReminderPickerOpen((v) => !v)}
+              >
+                <Plus size={16} color={c.primary} />
+                <Text style={styles.addRowText}>
+                  {reminders.length === 0 ? 'Add reminder' : 'Add another reminder'}
+                </Text>
+              </Pressable>
+            )}
+            {reminderPickerOpen && (
+              <View style={styles.popover}>
+                {availablePresets.map((preset) => (
+                  <Pressable
+                    key={preset}
+                    style={styles.popoverRow}
+                    onPress={() => addReminder(preset)}
+                  >
+                    <Text style={styles.popoverRowText}>{formatReminder(preset)}</Text>
+                  </Pressable>
+                ))}
+              </View>
+            )}
           </Section>
 
-          <Section icon={<Bell size={16} color={c.textMuted} />} label="Reminder">
-            <Pressable
+          <Section icon={<MapPin size={16} color={c.textMuted} />} label="Location">
+            <TextInput
+              value={location}
+              onChangeText={setLocation}
+              placeholder="Place or address"
+              placeholderTextColor={c.textMuted}
               style={styles.fieldButton}
-              onPress={() => setAlertOpen((v) => !v)}
-            >
-              <Text style={styles.fieldText}>{alertLabel}</Text>
-            </Pressable>
-            {alertOpen && (
-              <View style={styles.popover}>
-                {ALERT_OPTIONS.map((opt) => (
-                  <Pressable
-                    key={opt.value}
-                    style={[
-                      styles.popoverRow,
-                      opt.value === alert && styles.popoverRowActive,
-                    ]}
-                    onPress={() => {
-                      setAlert(opt.value);
-                      setAlertOpen(false);
-                    }}
-                  >
-                    <Text style={styles.popoverRowText}>{opt.label}</Text>
-                  </Pressable>
-                ))}
-              </View>
-            )}
+            />
+          </Section>
+
+          <Section icon={<Video size={16} color={c.textMuted} />} label="Video call">
+            <TextInput
+              value={videoUrl}
+              onChangeText={setVideoUrl}
+              placeholder="https://meet.example.com/…"
+              placeholderTextColor={c.textMuted}
+              autoCapitalize="none"
+              autoCorrect={false}
+              keyboardType="url"
+              style={styles.fieldButton}
+            />
           </Section>
 
           <Section
-            icon={<MapPin size={16} color={c.textMuted} />}
+            icon={<AlignLeft size={16} color={c.textMuted} />}
             label="Description"
           >
             <TextInput
               value={description}
               onChangeText={setDescription}
-              placeholder="Notes, location, link…"
+              placeholder="Notes, agenda…"
               placeholderTextColor={c.textMuted}
               multiline
               style={styles.descriptionInput}
@@ -629,6 +744,26 @@ function makeStyles(c: ThemePalette) {
   calendarRow: { flexDirection: 'row', alignItems: 'center', gap: spacing.sm },
   calendarSwatch: { width: 12, height: 12, borderRadius: 6 },
 
+  reminderRow: {
+    flexDirection: 'row',
+    alignItems: 'center',
+    justifyContent: 'space-between',
+    paddingHorizontal: spacing.md,
+    paddingVertical: spacing.sm,
+    borderRadius: radius.sm,
+    borderWidth: 1,
+    borderColor: c.border,
+    backgroundColor: c.surface,
+  },
+  reminderRemove: { padding: 2 },
+  addRow: {
+    flexDirection: 'row',
+    alignItems: 'center',
+    gap: spacing.sm,
+    paddingVertical: spacing.sm,
+  },
+  addRowText: { ...typography.body, color: c.primary },
+
   popover: {
     borderWidth: 1,
     borderColor: c.border,

src/components/calendar/ICalImportSheet.tsx

@@ -0,0 +1,391 @@
+import React from 'react';
+import {
+  View, Text, StyleSheet, ScrollView, Pressable, Modal, Animated, Easing, Alert, ActivityIndicator,
+} from 'react-native';
+import { SafeAreaView, useSafeAreaInsets } from 'react-native-safe-area-context';
+import { Upload, X, Check, CalendarPlus, AlertTriangle, Clock } from 'lucide-react-native';
+import { format, parseISO } from 'date-fns';
+import type { Calendar, CalendarEvent } from '../../api/types';
+import { uploadBlob } from '../../api/blob';
+import { parseCalendarBlob } from '../../api/calendar';
+import Button from '../Button';
+import { spacing, radius, typography, type ThemePalette } from '../../theme/tokens';
+import { useColors } from '../../theme/colors';
+import { getCalendarColor } from '../../lib/calendar-utils';
+
+// expo-document-picker is loaded lazily on first use; its native module is not
+// linked into every build (matches the FilesScreen / ContactImportSheet flow).
+type DocumentPickerModule = typeof import('expo-document-picker');
+let documentPickerModule: DocumentPickerModule | null = null;
+function loadDocumentPicker(): DocumentPickerModule | null {
+  if (documentPickerModule) return documentPickerModule;
+  try {
+    documentPickerModule = require('expo-document-picker') as DocumentPickerModule;
+    return documentPickerModule;
+  } catch {
+    return null;
+  }
+}
+
+interface Props {
+  visible: boolean;
+  onClose: () => void;
+  calendars: Calendar[];
+  /** Imports the selected events into the chosen calendar; returns count. */
+  onImport: (events: Partial<CalendarEvent>[], calendarId: string) => Promise<number>;
+  onImported?: (count: number) => void;
+}
+
+function eventDateLabel(event: Partial<CalendarEvent>): string | null {
+  if (!event.start) return null;
+  const d = parseISO(event.start);
+  if (isNaN(d.getTime())) return null;
+  return event.showWithoutTime ? format(d, 'EEE, MMM d, yyyy') : format(d, 'EEE, MMM d · HH:mm');
+}
+
+export function ICalImportSheet({ visible, onClose, calendars, onImport, onImported }: Props) {
+  const c = useColors();
+  const styles = React.useMemo(() => makeStyles(c), [c]);
+  const insets = useSafeAreaInsets();
+
+  const writable = React.useMemo(
+    () => calendars.filter((cal) => !cal.myRights || cal.myRights.mayWrite !== false),
+    [calendars],
+  );
+
+  const [parsed, setParsed] = React.useState<Partial<CalendarEvent>[]>([]);
+  const [selected, setSelected] = React.useState<Set<number>>(new Set());
+  const [calendarId, setCalendarId] = React.useState('');
+  const [error, setError] = React.useState<string | null>(null);
+  const [loading, setLoading] = React.useState(false);
+  const [importing, setImporting] = React.useState(false);
+  const [result, setResult] = React.useState<number | null>(null);
+
+  const slideY = React.useRef(new Animated.Value(900)).current;
+  const overlayOpacity = React.useRef(new Animated.Value(0)).current;
+
+  const resetState = React.useCallback(() => {
+    setParsed([]);
+    setSelected(new Set());
+    setError(null);
+    setLoading(false);
+    setImporting(false);
+    setResult(null);
+  }, []);
+
+  React.useEffect(() => {
+    if (visible) {
+      resetState();
+      if (writable[0]) setCalendarId(writable[0].id);
+      Animated.parallel([
+        Animated.timing(slideY, { toValue: 0, duration: 240, easing: Easing.out(Easing.cubic), useNativeDriver: true }),
+        Animated.timing(overlayOpacity, { toValue: 1, duration: 240, useNativeDriver: true }),
+      ]).start();
+    } else {
+      Animated.parallel([
+        Animated.timing(slideY, { toValue: 900, duration: 200, easing: Easing.in(Easing.cubic), useNativeDriver: true }),
+        Animated.timing(overlayOpacity, { toValue: 0, duration: 200, useNativeDriver: true }),
+      ]).start();
+    }
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [visible, slideY, overlayOpacity, resetState]);
+
+  const pickFile = async () => {
+    const picker = loadDocumentPicker();
+    if (!picker) {
+      Alert.alert(
+        'Import unavailable',
+        'The file picker is not installed in this build. Rebuild the app (expo run:android) to enable importing.',
+      );
+      return;
+    }
+    setError(null);
+    let res;
+    try {
+      res = await picker.getDocumentAsync({ copyToCacheDirectory: true, multiple: false });
+    } catch (e) {
+      setError(e instanceof Error ? e.message : 'Could not open the file picker');
+      return;
+    }
+    if (res.canceled || res.assets.length === 0) return;
+    const asset = res.assets[0];
+    if (asset.size && asset.size > 5 * 1024 * 1024) {
+      setError('That file is too large (max 5 MB).');
+      return;
+    }
+
+    setLoading(true);
+    try {
+      // Upload the .ics so the server can parse it (CalendarEvent/parse).
+      const { blobId } = await uploadBlob(asset.uri, 'text/calendar');
+      const events = await parseCalendarBlob(blobId);
+      const usable = events.filter((e) => !!e.start || e['@type'] === 'Task');
+      if (usable.length === 0) {
+        setError('No events were found in that file.');
+        return;
+      }
+      setParsed(usable);
+      setSelected(new Set(usable.map((_, i) => i)));
+    } catch (e) {
+      setError(e instanceof Error ? e.message : 'Could not read or parse that file.');
+    } finally {
+      setLoading(false);
+    }
+  };
+
+  const toggle = (idx: number) => {
+    setSelected((prev) => {
+      const next = new Set(prev);
+      if (next.has(idx)) next.delete(idx);
+      else next.add(idx);
+      return next;
+    });
+  };
+  const selectAll = () => setSelected(new Set(parsed.map((_, i) => i)));
+  const selectNone = () => setSelected(new Set());
+
+  const doImport = async () => {
+    if (!calendarId) {
+      Alert.alert('No calendar', 'Create a calendar before importing events.');
+      return;
+    }
+    const toImport = parsed.filter((_, i) => selected.has(i));
+    if (toImport.length === 0) return;
+    setImporting(true);
+    try {
+      const count = await onImport(toImport, calendarId);
+      setResult(count);
+      onImported?.(count);
+    } catch (e) {
+      setError(e instanceof Error ? e.message : 'Import failed.');
+    } finally {
+      setImporting(false);
+    }
+  };
+
+  return (
+    <Modal visible={visible} transparent animationType="none" onRequestClose={onClose} statusBarTranslucent>
+      <Animated.View style={[styles.overlay, { opacity: overlayOpacity }]}>
+        <Pressable style={{ flex: 1 }} onPress={onClose} />
+      </Animated.View>
+      <Animated.View style={[styles.sheet, { transform: [{ translateY: slideY }] }]}>
+        <SafeAreaView edges={['bottom']} style={{ flex: 1 }}>
+          <View style={styles.header}>
+            <Text style={styles.title}>Import calendar</Text>
+            <Pressable onPress={onClose} hitSlop={8} style={styles.close}>
+              <X size={20} color={c.text} />
+            </Pressable>
+          </View>
+
+          {result !== null ? (
+            <View style={styles.center}>
+              <View style={styles.successBadge}>
+                <Check size={26} color={c.primaryForeground} />
+              </View>
+              <Text style={styles.successText}>
+                Imported {result} event{result === 1 ? '' : 's'}.
+              </Text>
+              <Button variant="outline" size="sm" onPress={onClose}>Done</Button>
+            </View>
+          ) : parsed.length === 0 ? (
+            <View style={styles.center}>
+              <Pressable style={styles.dropZone} onPress={() => { void pickFile(); }} disabled={loading}>
+                {loading ? (
+                  <ActivityIndicator color={c.primary} />
+                ) : (
+                  <Upload size={32} color={c.textMuted} />
+                )}
+                <Text style={styles.dropTitle}>{loading ? 'Parsing…' : 'Choose an .ics file'}</Text>
+                <Text style={styles.dropHint}>iCalendar — single or multiple events</Text>
+              </Pressable>
+              {!!error && (
+                <View style={styles.errorBox}>
+                  <AlertTriangle size={16} color={c.error} />
+                  <Text style={styles.errorText}>{error}</Text>
+                </View>
+              )}
+            </View>
+          ) : (
+            <>
+              {writable.length > 1 && (
+                <ScrollView horizontal showsHorizontalScrollIndicator={false} contentContainerStyle={styles.calChips}>
+                  {writable.map((cal) => (
+                    <Pressable
+                      key={cal.id}
+                      onPress={() => setCalendarId(cal.id)}
+                      style={[styles.calChip, cal.id === calendarId && styles.calChipActive]}
+                    >
+                      <View style={[styles.calSwatch, { backgroundColor: getCalendarColor(cal) }]} />
+                      <Text style={styles.calChipText} numberOfLines={1}>{cal.name}</Text>
+                    </Pressable>
+                  ))}
+                </ScrollView>
+              )}
+
+              <View style={styles.toolbar}>
+                <Text style={styles.toolbarCount}>
+                  {parsed.length} found · {selected.size} selected
+                </Text>
+                <View style={{ flexDirection: 'row', gap: spacing.md }}>
+                  <Pressable onPress={selectAll} hitSlop={6}><Text style={styles.link}>All</Text></Pressable>
+                  <Pressable onPress={selectNone} hitSlop={6}><Text style={styles.link}>None</Text></Pressable>
+                </View>
+              </View>
+
+              <ScrollView style={{ flex: 1 }}>
+                {parsed.map((event, idx) => {
+                  const isSelected = selected.has(idx);
+                  const date = eventDateLabel(event);
+                  return (
+                    <Pressable
+                      key={idx}
+                      onPress={() => toggle(idx)}
+                      style={({ pressed }) => [styles.row, pressed && styles.rowPressed]}
+                    >
+                      <View style={[styles.checkbox, isSelected && styles.checkboxOn]}>
+                        {isSelected && <Check size={13} color={c.primaryForeground} />}
+                      </View>
+                      <Clock size={16} color={c.textMuted} />
+                      <View style={{ flex: 1, minWidth: 0 }}>
+                        <Text style={styles.rowName} numberOfLines={1}>{event.title || 'Untitled event'}</Text>
+                        {!!date && <Text style={styles.rowDate} numberOfLines={1}>{date}</Text>}
+                      </View>
+                    </Pressable>
+                  );
+                })}
+              </ScrollView>
+
+              {!!error && (
+                <View style={styles.errorBox}>
+                  <AlertTriangle size={16} color={c.error} />
+                  <Text style={styles.errorText}>{error}</Text>
+                </View>
+              )}
+
+              <View style={[styles.footer, { paddingBottom: Math.max(insets.bottom, spacing.md) }]}>
+                <Button variant="outline" onPress={onClose} disabled={importing}>Cancel</Button>
+                <Button
+                  onPress={() => { void doImport(); }}
+                  disabled={importing || selected.size === 0}
+                  icon={importing ? <ActivityIndicator size="small" color={c.primaryForeground} /> : <CalendarPlus size={16} color={c.primaryForeground} />}
+                >
+                  {importing ? 'Importing…' : `Import ${selected.size}`}
+                </Button>
+              </View>
+            </>
+          )}
+        </SafeAreaView>
+      </Animated.View>
+    </Modal>
+  );
+}
+
+function makeStyles(c: ThemePalette) {
+  return StyleSheet.create({
+    overlay: { ...StyleSheet.absoluteFillObject, backgroundColor: 'rgba(0,0,0,0.5)' },
+    sheet: {
+      position: 'absolute',
+      left: 0,
+      right: 0,
+      bottom: 0,
+      height: '85%',
+      backgroundColor: c.popover,
+      borderTopLeftRadius: radius.lg,
+      borderTopRightRadius: radius.lg,
+      borderTopWidth: 1,
+      borderColor: c.border,
+    },
+    header: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      justifyContent: 'space-between',
+      paddingHorizontal: spacing.lg,
+      paddingVertical: spacing.md,
+      borderBottomWidth: 1,
+      borderBottomColor: c.border,
+    },
+    title: { ...typography.h3, color: c.text },
+    close: { width: 36, height: 36, alignItems: 'center', justifyContent: 'center', borderRadius: radius.sm },
+    center: { flex: 1, alignItems: 'center', justifyContent: 'center', gap: spacing.lg, padding: spacing.xl },
+    dropZone: {
+      width: '100%',
+      borderWidth: 2,
+      borderColor: c.border,
+      borderStyle: 'dashed',
+      borderRadius: radius.lg,
+      paddingVertical: spacing.xxxl,
+      alignItems: 'center',
+      gap: spacing.sm,
+    },
+    dropTitle: { ...typography.bodyMedium, color: c.text },
+    dropHint: { ...typography.caption, color: c.textMuted },
+    successBadge: {
+      width: 56, height: 56, borderRadius: radius.full,
+      backgroundColor: c.primary, alignItems: 'center', justifyContent: 'center',
+    },
+    successText: { ...typography.bodyMedium, color: c.text },
+    calChips: { paddingHorizontal: spacing.lg, paddingVertical: spacing.sm, gap: spacing.sm },
+    calChip: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      gap: spacing.xs,
+      paddingHorizontal: spacing.sm,
+      paddingVertical: spacing.xs,
+      borderRadius: radius.full,
+      borderWidth: 1,
+      borderColor: c.border,
+      maxWidth: 160,
+    },
+    calChipActive: { borderColor: c.primary, backgroundColor: c.primaryBg },
+    calSwatch: { width: 10, height: 10, borderRadius: 5 },
+    calChipText: { ...typography.caption, color: c.text, flexShrink: 1 },
+    toolbar: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      justifyContent: 'space-between',
+      paddingHorizontal: spacing.lg,
+      paddingVertical: spacing.sm,
+    },
+    toolbarCount: { ...typography.caption, color: c.textMuted },
+    link: { ...typography.captionMedium, color: c.primary },
+    row: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      gap: spacing.md,
+      paddingHorizontal: spacing.lg,
+      paddingVertical: spacing.sm + 2,
+      minHeight: 48,
+    },
+    rowPressed: { backgroundColor: c.surfaceHover },
+    checkbox: {
+      width: 20, height: 20, borderRadius: radius.xs,
+      borderWidth: 1, borderColor: c.border,
+      alignItems: 'center', justifyContent: 'center',
+    },
+    checkboxOn: { backgroundColor: c.primary, borderColor: c.primary },
+    rowName: { ...typography.body, color: c.text },
+    rowDate: { ...typography.caption, color: c.textMuted, marginTop: 1 },
+    errorBox: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      gap: spacing.sm,
+      marginHorizontal: spacing.lg,
+      marginTop: spacing.sm,
+      padding: spacing.md,
+      borderRadius: radius.sm,
+      backgroundColor: c.errorBg,
+      borderWidth: 1,
+      borderColor: c.errorBorder,
+    },
+    errorText: { ...typography.caption, color: c.errorForeground, flex: 1 },
+    footer: {
+      flexDirection: 'row',
+      justifyContent: 'flex-end',
+      gap: spacing.md,
+      paddingHorizontal: spacing.lg,
+      paddingTop: spacing.md,
+      borderTopWidth: 1,
+      borderTopColor: c.border,
+    },
+  });
+}

src/components/calendar/ICalSubscriptionSheet.tsx

@@ -0,0 +1,262 @@
+import React from 'react';
+import {
+  View, Text, StyleSheet, ScrollView, Pressable, Modal, Animated, Easing, TextInput, ActivityIndicator,
+} from 'react-native';
+import { SafeAreaView, useSafeAreaInsets } from 'react-native-safe-area-context';
+import { X, Plus, RefreshCw, Trash2, Rss, AlertTriangle } from 'lucide-react-native';
+import { formatDistanceToNow } from 'date-fns';
+import Button from '../Button';
+import { spacing, radius, typography, type ThemePalette } from '../../theme/tokens';
+import { useColors } from '../../theme/colors';
+import { CALENDAR_COLOR_PALETTE } from '../../lib/calendar-utils';
+import { useCalendarSubscriptionsStore } from '../../stores/calendar-subscriptions-store';
+
+interface Props {
+  visible: boolean;
+  onClose: () => void;
+}
+
+export function ICalSubscriptionSheet({ visible, onClose }: Props) {
+  const c = useColors();
+  const styles = React.useMemo(() => makeStyles(c), [c]);
+  const insets = useSafeAreaInsets();
+  const subscriptions = useCalendarSubscriptionsStore((s) => s.subscriptions);
+  const syncing = useCalendarSubscriptionsStore((s) => s.syncing);
+  const addSubscription = useCalendarSubscriptionsStore((s) => s.addSubscription);
+  const removeSubscription = useCalendarSubscriptionsStore((s) => s.removeSubscription);
+  const syncSubscription = useCalendarSubscriptionsStore((s) => s.syncSubscription);
+
+  const [name, setName] = React.useState('');
+  const [url, setUrl] = React.useState('');
+  const [color, setColor] = React.useState<string>(CALENDAR_COLOR_PALETTE[0]);
+  const [adding, setAdding] = React.useState(false);
+  const [formError, setFormError] = React.useState<string | null>(null);
+
+  const slideY = React.useRef(new Animated.Value(900)).current;
+  const overlayOpacity = React.useRef(new Animated.Value(0)).current;
+
+  React.useEffect(() => {
+    if (visible) {
+      setName('');
+      setUrl('');
+      setColor(CALENDAR_COLOR_PALETTE[0]);
+      setFormError(null);
+      Animated.parallel([
+        Animated.timing(slideY, { toValue: 0, duration: 240, easing: Easing.out(Easing.cubic), useNativeDriver: true }),
+        Animated.timing(overlayOpacity, { toValue: 1, duration: 240, useNativeDriver: true }),
+      ]).start();
+    } else {
+      Animated.parallel([
+        Animated.timing(slideY, { toValue: 900, duration: 200, easing: Easing.in(Easing.cubic), useNativeDriver: true }),
+        Animated.timing(overlayOpacity, { toValue: 0, duration: 200, useNativeDriver: true }),
+      ]).start();
+    }
+  }, [visible, slideY, overlayOpacity]);
+
+  const handleAdd = async () => {
+    const n = name.trim();
+    const u = url.trim();
+    if (!n || !u) {
+      setFormError('Enter a name and a feed URL.');
+      return;
+    }
+    if (!/^(https?|webcal):\/\//i.test(u)) {
+      setFormError('URL must start with https://, http:// or webcal://');
+      return;
+    }
+    setFormError(null);
+    setAdding(true);
+    try {
+      const sub = await addSubscription({ name: n, url: u, color });
+      if (sub.lastError) {
+        setFormError(sub.lastError);
+      } else {
+        setName('');
+        setUrl('');
+      }
+    } catch (e) {
+      setFormError(e instanceof Error ? e.message : 'Could not add subscription.');
+    } finally {
+      setAdding(false);
+    }
+  };
+
+  return (
+    <Modal visible={visible} transparent animationType="none" onRequestClose={onClose} statusBarTranslucent>
+      <Animated.View style={[styles.overlay, { opacity: overlayOpacity }]}>
+        <Pressable style={{ flex: 1 }} onPress={onClose} />
+      </Animated.View>
+      <Animated.View style={[styles.sheet, { transform: [{ translateY: slideY }] }]}>
+        <SafeAreaView edges={['bottom']} style={{ flex: 1 }}>
+          <View style={styles.header}>
+            <Rss size={20} color={c.text} />
+            <Text style={styles.title}>Calendar subscriptions</Text>
+            <Pressable onPress={onClose} hitSlop={8} style={styles.close}>
+              <X size={20} color={c.text} />
+            </Pressable>
+          </View>
+
+          <ScrollView style={{ flex: 1 }} contentContainerStyle={styles.scroll}>
+            <Text style={styles.sectionLabel}>Add a feed</Text>
+            <TextInput
+              value={name}
+              onChangeText={setName}
+              placeholder="Name (e.g. Holidays)"
+              placeholderTextColor={c.textMuted}
+              style={styles.input}
+            />
+            <TextInput
+              value={url}
+              onChangeText={setUrl}
+              placeholder="https://… or webcal://…"
+              placeholderTextColor={c.textMuted}
+              autoCapitalize="none"
+              autoCorrect={false}
+              keyboardType="url"
+              style={styles.input}
+            />
+            <View style={styles.colorRow}>
+              {CALENDAR_COLOR_PALETTE.map((col) => (
+                <Pressable
+                  key={col}
+                  onPress={() => setColor(col)}
+                  style={[
+                    styles.colorDot,
+                    { backgroundColor: col },
+                    color === col && styles.colorDotActive,
+                  ]}
+                />
+              ))}
+            </View>
+            {!!formError && (
+              <View style={styles.errorBox}>
+                <AlertTriangle size={16} color={c.error} />
+                <Text style={styles.errorText}>{formError}</Text>
+              </View>
+            )}
+            <Button
+              onPress={() => { void handleAdd(); }}
+              disabled={adding}
+              icon={adding ? <ActivityIndicator size="small" color={c.primaryForeground} /> : <Plus size={16} color={c.primaryForeground} />}
+            >
+              {adding ? 'Subscribing…' : 'Subscribe'}
+            </Button>
+
+            {subscriptions.length > 0 && (
+              <>
+                <Text style={[styles.sectionLabel, { marginTop: spacing.xl }]}>Your subscriptions</Text>
+                {subscriptions.map((sub) => {
+                  const busy = !!syncing[sub.id];
+                  return (
+                    <View key={sub.id} style={styles.subRow}>
+                      <View style={[styles.subSwatch, { backgroundColor: sub.color || c.primary }]} />
+                      <View style={{ flex: 1, minWidth: 0 }}>
+                        <Text style={styles.subName} numberOfLines={1}>{sub.name}</Text>
+                        <Text style={styles.subMeta} numberOfLines={1}>
+                          {sub.lastError
+                            ? sub.lastError
+                            : sub.lastSyncAt
+                              ? `Synced ${formatDistanceToNow(sub.lastSyncAt, { addSuffix: true })}`
+                              : 'Not synced yet'}
+                        </Text>
+                      </View>
+                      <Pressable
+                        onPress={() => { void syncSubscription(sub.id); }}
+                        hitSlop={6}
+                        style={styles.subBtn}
+                        disabled={busy}
+                      >
+                        {busy ? (
+                          <ActivityIndicator size="small" color={c.textMuted} />
+                        ) : (
+                          <RefreshCw size={16} color={c.textSecondary} />
+                        )}
+                      </Pressable>
+                      <Pressable
+                        onPress={() => { void removeSubscription(sub.id); }}
+                        hitSlop={6}
+                        style={styles.subBtn}
+                      >
+                        <Trash2 size={16} color={c.error} />
+                      </Pressable>
+                    </View>
+                  );
+                })}
+              </>
+            )}
+          </ScrollView>
+          <View style={{ height: insets.bottom }} />
+        </SafeAreaView>
+      </Animated.View>
+    </Modal>
+  );
+}
+
+function makeStyles(c: ThemePalette) {
+  return StyleSheet.create({
+    overlay: { ...StyleSheet.absoluteFillObject, backgroundColor: 'rgba(0,0,0,0.5)' },
+    sheet: {
+      position: 'absolute',
+      left: 0,
+      right: 0,
+      bottom: 0,
+      maxHeight: '88%',
+      backgroundColor: c.popover,
+      borderTopLeftRadius: radius.lg,
+      borderTopRightRadius: radius.lg,
+      borderTopWidth: 1,
+      borderColor: c.border,
+    },
+    header: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      gap: spacing.sm,
+      paddingHorizontal: spacing.lg,
+      paddingVertical: spacing.md,
+      borderBottomWidth: 1,
+      borderBottomColor: c.border,
+    },
+    title: { flex: 1, ...typography.h3, color: c.text },
+    close: { width: 36, height: 36, alignItems: 'center', justifyContent: 'center', borderRadius: radius.sm },
+    scroll: { padding: spacing.lg, gap: spacing.sm },
+    sectionLabel: { ...typography.bodySemibold, color: c.text, marginBottom: spacing.xs },
+    input: {
+      ...typography.body,
+      color: c.text,
+      borderWidth: 1,
+      borderColor: c.border,
+      borderRadius: radius.sm,
+      paddingHorizontal: spacing.md,
+      paddingVertical: spacing.sm,
+      backgroundColor: c.surface,
+      marginBottom: spacing.sm,
+    },
+    colorRow: { flexDirection: 'row', flexWrap: 'wrap', gap: spacing.sm, marginBottom: spacing.md },
+    colorDot: { width: 26, height: 26, borderRadius: 13, borderWidth: 2, borderColor: 'transparent' },
+    colorDotActive: { borderColor: c.text },
+    errorBox: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      gap: spacing.sm,
+      padding: spacing.md,
+      borderRadius: radius.sm,
+      backgroundColor: c.errorBg,
+      borderWidth: 1,
+      borderColor: c.errorBorder,
+      marginBottom: spacing.sm,
+    },
+    errorText: { ...typography.caption, color: c.errorForeground, flex: 1 },
+    subRow: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      gap: spacing.md,
+      paddingVertical: spacing.sm,
+      borderBottomWidth: 1,
+      borderBottomColor: c.borderLight,
+    },
+    subSwatch: { width: 14, height: 14, borderRadius: 7 },
+    subName: { ...typography.body, color: c.text },
+    subMeta: { ...typography.caption, color: c.textMuted, marginTop: 1 },
+    subBtn: { width: 32, height: 32, alignItems: 'center', justifyContent: 'center', borderRadius: radius.sm },
+  });
+}

src/components/calendar/RecurrenceEditor.tsx

@@ -0,0 +1,370 @@
+import React from 'react';
+import { View, Text, TextInput, Pressable, StyleSheet, Platform } from 'react-native';
+import DateTimePicker from '@react-native-community/datetimepicker';
+import { ChevronDown } from 'lucide-react-native';
+import { format, parseISO } from 'date-fns';
+import type { RecurrenceRule } from '../../api/types';
+import { radius, spacing, typography, type ThemePalette } from '../../theme/tokens';
+import { useColors } from '../../theme/colors';
+import { Button } from '..';
+import {
+  EDITOR_FREQUENCIES,
+  UNIT_LABELS,
+  WEEKDAYS,
+  buildRecurrenceSummary,
+  buildRuleFromEditorValue,
+  capitalize,
+  editorValueFromRule,
+  monthName,
+  nthLabel,
+  weekdayName,
+  type EditorFrequency,
+  type EndsMode,
+  type MonthlyMode,
+  type RecurrenceEditorValue,
+} from '../../lib/recurrence';
+
+interface RecurrenceEditorProps {
+  rule: RecurrenceRule | null;
+  eventStart: Date;
+  onSave: (rule: RecurrenceRule) => void;
+  onCancel: () => void;
+}
+
+// Small popover-style select, matching the EventModal field pattern.
+function InlineSelect<T extends string | number>({
+  value,
+  options,
+  onChange,
+  flex,
+}: {
+  value: T;
+  options: { value: T; label: string }[];
+  onChange: (value: T) => void;
+  flex?: boolean;
+}) {
+  const c = useColors();
+  const styles = React.useMemo(() => makeStyles(c), [c]);
+  const [open, setOpen] = React.useState(false);
+  const selected = options.find((o) => o.value === value);
+  return (
+    <View style={flex ? styles.selectFlex : undefined}>
+      <Pressable style={styles.selectButton} onPress={() => setOpen((v) => !v)}>
+        <Text style={styles.selectText} numberOfLines={1}>
+          {selected?.label ?? String(value)}
+        </Text>
+        <ChevronDown size={14} color={c.textMuted} />
+      </Pressable>
+      {open && (
+        <View style={styles.popover}>
+          {options.map((opt) => (
+            <Pressable
+              key={String(opt.value)}
+              style={[styles.popoverRow, opt.value === value && styles.popoverRowActive]}
+              onPress={() => {
+                onChange(opt.value);
+                setOpen(false);
+              }}
+            >
+              <Text style={styles.popoverRowText}>{opt.label}</Text>
+            </Pressable>
+          ))}
+        </View>
+      )}
+    </View>
+  );
+}
+
+function NumberInput({
+  value,
+  min,
+  max,
+  onChange,
+}: {
+  value: number;
+  min: number;
+  max: number;
+  onChange: (value: number) => void;
+}) {
+  const c = useColors();
+  const styles = React.useMemo(() => makeStyles(c), [c]);
+  const [text, setText] = React.useState(String(value));
+  React.useEffect(() => setText(String(value)), [value]);
+  return (
+    <TextInput
+      value={text}
+      onChangeText={setText}
+      onEndEditing={() => {
+        const n = parseInt(text, 10);
+        const clamped = Number.isFinite(n) ? Math.min(max, Math.max(min, n)) : min;
+        setText(String(clamped));
+        onChange(clamped);
+      }}
+      keyboardType="number-pad"
+      style={styles.numberInput}
+    />
+  );
+}
+
+export function RecurrenceEditor({ rule, eventStart, onSave, onCancel }: RecurrenceEditorProps) {
+  const c = useColors();
+  const styles = React.useMemo(() => makeStyles(c), [c]);
+
+  const [value, setValue] = React.useState<RecurrenceEditorValue>(() =>
+    editorValueFromRule(rule, eventStart),
+  );
+  const [showUntilPicker, setShowUntilPicker] = React.useState(false);
+
+  const update = (patch: Partial<RecurrenceEditorValue>) =>
+    setValue((prev) => ({ ...prev, ...patch }));
+
+  const toggleWeekDay = (day: string) => {
+    setValue((prev) => ({
+      ...prev,
+      weekDays: prev.weekDays.includes(day)
+        ? prev.weekDays.length > 1
+          ? prev.weekDays.filter((d) => d !== day)
+          : prev.weekDays
+        : [...prev.weekDays, day],
+    }));
+  };
+
+  const builtRule = buildRuleFromEditorValue(value, eventStart);
+  const summary = buildRecurrenceSummary(builtRule);
+
+  return (
+    <View style={styles.container}>
+      <View style={styles.row}>
+        <Text style={styles.rowLabel}>Every</Text>
+        <NumberInput
+          value={value.interval}
+          min={1}
+          max={999}
+          onChange={(interval) => update({ interval })}
+        />
+        <InlineSelect<EditorFrequency>
+          flex
+          value={value.frequency}
+          options={EDITOR_FREQUENCIES.map((f) => ({ value: f, label: UNIT_LABELS[f] }))}
+          onChange={(frequency) => update({ frequency })}
+        />
+      </View>
+
+      {value.frequency === 'weekly' && (
+        <View style={styles.weekdayRow}>
+          {WEEKDAYS.map((day) => {
+            const active = value.weekDays.includes(day);
+            return (
+              <Pressable
+                key={day}
+                onPress={() => toggleWeekDay(day)}
+                style={[styles.weekdayChip, active && styles.weekdayChipActive]}
+              >
+                <Text style={[styles.weekdayChipText, active && styles.weekdayChipTextActive]}>
+                  {weekdayName(day, 'short')}
+                </Text>
+              </Pressable>
+            );
+          })}
+        </View>
+      )}
+
+      {value.frequency === 'yearly' && (
+        <View style={styles.row}>
+          <Text style={styles.rowLabel}>In</Text>
+          <InlineSelect<number>
+            flex
+            value={value.month}
+            options={Array.from({ length: 12 }, (_, i) => i + 1).map((m) => ({
+              value: m,
+              label: capitalize(monthName(m)),
+            }))}
+            onChange={(month) => update({ month })}
+          />
+        </View>
+      )}
+
+      {(value.frequency === 'monthly' || value.frequency === 'yearly') && (
+        <View style={styles.row}>
+          <InlineSelect<MonthlyMode>
+            value={value.monthlyMode}
+            options={[
+              { value: 'day', label: 'On day' },
+              { value: 'nth', label: 'On the' },
+            ]}
+            onChange={(monthlyMode) => update({ monthlyMode })}
+          />
+          {value.monthlyMode === 'day' ? (
+            <NumberInput
+              value={value.monthDay}
+              min={1}
+              max={31}
+              onChange={(monthDay) => update({ monthDay })}
+            />
+          ) : (
+            <>
+              <InlineSelect<number>
+                flex
+                value={value.nth}
+                options={[1, 2, 3, 4, -1].map((n) => ({ value: n, label: capitalize(nthLabel(n)) }))}
+                onChange={(nth) => update({ nth })}
+              />
+              <InlineSelect<string>
+                flex
+                value={value.nthDay}
+                options={WEEKDAYS.map((d) => ({ value: d, label: capitalize(weekdayName(d)) }))}
+                onChange={(nthDay) => update({ nthDay })}
+              />
+            </>
+          )}
+        </View>
+      )}
+
+      <View style={styles.row}>
+        <Text style={styles.rowLabel}>Ends</Text>
+        <InlineSelect<EndsMode>
+          flex={value.endsMode === 'never'}
+          value={value.endsMode}
+          options={[
+            { value: 'never', label: 'Never' },
+            { value: 'on', label: 'On date' },
+            { value: 'after', label: 'After' },
+          ]}
+          onChange={(endsMode) => update({ endsMode })}
+        />
+        {value.endsMode === 'on' && (
+          <Pressable style={[styles.selectButton, styles.selectFlex]} onPress={() => setShowUntilPicker(true)}>
+            <Text style={styles.selectText}>
+              {format(parseISO(value.untilDate), 'MMM d, yyyy')}
+            </Text>
+          </Pressable>
+        )}
+        {value.endsMode === 'after' && (
+          <>
+            <NumberInput
+              value={value.count}
+              min={1}
+              max={999}
+              onChange={(count) => update({ count })}
+            />
+            <Text style={styles.muted}>occurrences</Text>
+          </>
+        )}
+      </View>
+
+      <View style={styles.footer}>
+        <Text style={styles.summary} numberOfLines={2}>
+          {summary}
+        </Text>
+        <View style={styles.footerButtons}>
+          <Button variant="outline" size="sm" onPress={onCancel}>
+            Cancel
+          </Button>
+          <Button variant="default" size="sm" onPress={() => onSave(builtRule)}>
+            Done
+          </Button>
+        </View>
+      </View>
+
+      {showUntilPicker && (
+        <DateTimePicker
+          value={parseISO(value.untilDate)}
+          mode="date"
+          display={Platform.OS === 'ios' ? 'spinner' : 'default'}
+          onChange={(_, d) => {
+            setShowUntilPicker(false);
+            if (d) update({ untilDate: format(d, 'yyyy-MM-dd') });
+          }}
+        />
+      )}
+    </View>
+  );
+}
+
+function makeStyles(c: ThemePalette) {
+  return StyleSheet.create({
+    container: {
+      borderWidth: 1,
+      borderColor: c.border,
+      borderRadius: radius.sm,
+      backgroundColor: c.surface,
+      padding: spacing.md,
+      gap: spacing.sm,
+    },
+    row: { flexDirection: 'row', alignItems: 'center', gap: spacing.sm },
+    rowLabel: { ...typography.body, color: c.textSecondary },
+    muted: { ...typography.caption, color: c.textMuted, flexShrink: 1 },
+
+    numberInput: {
+      minWidth: 52,
+      paddingHorizontal: spacing.sm,
+      paddingVertical: spacing.xs,
+      borderRadius: radius.xs,
+      borderWidth: 1,
+      borderColor: c.border,
+      backgroundColor: c.background,
+      color: c.text,
+      ...typography.body,
+      textAlign: 'center',
+    },
+
+    selectFlex: { flex: 1, minWidth: 0 },
+    selectButton: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      justifyContent: 'space-between',
+      gap: spacing.xs,
+      paddingHorizontal: spacing.sm,
+      paddingVertical: spacing.xs,
+      minHeight: 36,
+      borderRadius: radius.xs,
+      borderWidth: 1,
+      borderColor: c.border,
+      backgroundColor: c.background,
+    },
+    selectText: { ...typography.body, color: c.text, flexShrink: 1 },
+
+    popover: {
+      marginTop: spacing.xs,
+      borderWidth: 1,
+      borderColor: c.border,
+      borderRadius: radius.xs,
+      backgroundColor: c.background,
+      overflow: 'hidden',
+    },
+    popoverRow: {
+      paddingHorizontal: spacing.md,
+      paddingVertical: spacing.sm,
+      borderBottomWidth: 1,
+      borderBottomColor: c.borderLight,
+    },
+    popoverRowActive: { backgroundColor: c.primaryBg },
+    popoverRowText: { ...typography.body, color: c.text },
+
+    weekdayRow: { flexDirection: 'row', gap: 4 },
+    weekdayChip: {
+      flex: 1,
+      minWidth: 0,
+      paddingVertical: spacing.xs,
+      borderRadius: radius.xs,
+      borderWidth: 1,
+      borderColor: c.border,
+      alignItems: 'center',
+    },
+    weekdayChipActive: {
+      borderColor: c.primary,
+      backgroundColor: c.primaryBg,
+    },
+    weekdayChipText: { ...typography.caption, color: c.textMuted },
+    weekdayChipTextActive: { color: c.primary },
+
+    footer: {
+      borderTopWidth: 1,
+      borderTopColor: c.border,
+      paddingTop: spacing.sm,
+      gap: spacing.sm,
+    },
+    summary: { ...typography.caption, color: c.textMuted },
+    footerButtons: { flexDirection: 'row', justifyContent: 'flex-end', gap: spacing.sm },
+  });
+}

src/components/calendar/TasksSheet.tsx

@@ -0,0 +1,371 @@
+import React from 'react';
+import {
+  Animated,
+  Dimensions,
+  Easing,
+  Modal,
+  Platform,
+  Pressable,
+  ScrollView,
+  StyleSheet,
+  Text,
+  TextInput,
+  View,
+} from 'react-native';
+import { SafeAreaView } from 'react-native-safe-area-context';
+import DateTimePicker from '@react-native-community/datetimepicker';
+import {
+  Calendar as CalendarIcon,
+  Check,
+  ListChecks,
+  Plus,
+  Trash2,
+  X,
+} from 'lucide-react-native';
+import { format, parseISO } from 'date-fns';
+import type { Calendar, CalendarEvent } from '../../api/types';
+import { radius, spacing, typography, type ThemePalette } from '../../theme/tokens';
+import { useColors } from '../../theme/colors';
+import { getCalendarColor } from '../../lib/calendar-utils';
+import { useSheetDrag } from '../../lib/use-sheet-drag';
+
+interface TasksSheetProps {
+  visible: boolean;
+  tasks: CalendarEvent[];
+  calendars: Calendar[];
+  onClose: () => void;
+  onCreate: (task: Partial<CalendarEvent>, calendarId: string) => Promise<void> | void;
+  onToggle: (id: string) => Promise<void> | void;
+  onDelete: (id: string) => Promise<void> | void;
+}
+
+function isCompleted(task: CalendarEvent): boolean {
+  return task.progress === 'completed';
+}
+
+function dueLabel(task: CalendarEvent): string | null {
+  if (!task.due) return null;
+  const d = parseISO(task.due);
+  if (isNaN(d.getTime())) return null;
+  return format(d, 'EEE, MMM d');
+}
+
+// Tasks first by completion (open first), then by due date (soonest first,
+// undated last), then title.
+function compareTasks(a: CalendarEvent, b: CalendarEvent): number {
+  const ac = isCompleted(a);
+  const bc = isCompleted(b);
+  if (ac !== bc) return ac ? 1 : -1;
+  const ad = a.due ? parseISO(a.due).getTime() : Infinity;
+  const bd = b.due ? parseISO(b.due).getTime() : Infinity;
+  if (ad !== bd) return ad - bd;
+  return (a.title || '').localeCompare(b.title || '');
+}
+
+export function TasksSheet({
+  visible,
+  tasks,
+  calendars,
+  onClose,
+  onCreate,
+  onToggle,
+  onDelete,
+}: TasksSheetProps) {
+  const c = useColors();
+  const styles = React.useMemo(() => makeStyles(c), [c]);
+  const slideY = React.useRef(new Animated.Value(Dimensions.get('window').height)).current;
+  const overlayOpacity = React.useRef(new Animated.Value(0)).current;
+  const dragHandlers = useSheetDrag({
+    slideY,
+    closedY: Dimensions.get('window').height,
+    onClose,
+  });
+
+  const writableCalendars = React.useMemo(
+    () => calendars.filter((cal) => !cal.myRights || cal.myRights.mayWrite !== false),
+    [calendars],
+  );
+
+  const [title, setTitle] = React.useState('');
+  const [calendarId, setCalendarId] = React.useState('');
+  const [due, setDue] = React.useState<Date | null>(null);
+  const [showDuePicker, setShowDuePicker] = React.useState(false);
+  const [saving, setSaving] = React.useState(false);
+
+  React.useEffect(() => {
+    if (visible && !calendarId && writableCalendars[0]) {
+      setCalendarId(writableCalendars[0].id);
+    }
+  }, [visible, calendarId, writableCalendars]);
+
+  React.useEffect(() => {
+    if (visible) {
+      Animated.parallel([
+        Animated.timing(slideY, { toValue: 0, duration: 240, easing: Easing.out(Easing.cubic), useNativeDriver: true }),
+        Animated.timing(overlayOpacity, { toValue: 1, duration: 240, useNativeDriver: true }),
+      ]).start();
+    } else {
+      Animated.parallel([
+        Animated.timing(slideY, { toValue: Dimensions.get('window').height, duration: 200, easing: Easing.in(Easing.cubic), useNativeDriver: true }),
+        Animated.timing(overlayOpacity, { toValue: 0, duration: 200, useNativeDriver: true }),
+      ]).start();
+    }
+  }, [visible, slideY, overlayOpacity]);
+
+  const sorted = React.useMemo(() => [...tasks].sort(compareTasks), [tasks]);
+
+  const handleAdd = async () => {
+    const t = title.trim();
+    if (!t || !calendarId || saving) return;
+    setSaving(true);
+    try {
+      const task: Partial<CalendarEvent> = {
+        title: t,
+        progress: 'needs-action',
+      };
+      if (due) {
+        task.due = format(due, "yyyy-MM-dd'T'HH:mm:ss");
+      }
+      await onCreate(task, calendarId);
+      setTitle('');
+      setDue(null);
+    } finally {
+      setSaving(false);
+    }
+  };
+
+  return (
+    <Modal visible={visible} transparent animationType="none" statusBarTranslucent onRequestClose={onClose}>
+      <Animated.View style={[styles.overlay, { opacity: overlayOpacity }]}>
+        <Pressable style={styles.overlayPress} onPress={onClose} />
+      </Animated.View>
+
+      <Animated.View style={[styles.sheet, { transform: [{ translateY: slideY }] }]}>
+        <SafeAreaView edges={['bottom']} style={styles.sheetSafe}>
+          <View {...dragHandlers}>
+            <View style={styles.handleHit}>
+              <View style={styles.handle} />
+            </View>
+            <View style={styles.header}>
+              <ListChecks size={20} color={c.text} />
+              <Text style={styles.headerTitle}>Tasks</Text>
+              <Pressable onPress={onClose} style={styles.closeBtn} hitSlop={8}>
+                <X size={20} color={c.textMuted} />
+              </Pressable>
+            </View>
+          </View>
+
+          <View style={styles.addRow}>
+            <TextInput
+              value={title}
+              onChangeText={setTitle}
+              placeholder="Add a task…"
+              placeholderTextColor={c.textMuted}
+              style={styles.addInput}
+              returnKeyType="done"
+              onSubmitEditing={() => { void handleAdd(); }}
+            />
+            <Pressable
+              onPress={() => setShowDuePicker(true)}
+              style={[styles.dueChip, due && styles.dueChipActive]}
+              hitSlop={6}
+            >
+              <CalendarIcon size={14} color={due ? c.primary : c.textMuted} />
+              {due && <Text style={styles.dueChipText}>{format(due, 'MMM d')}</Text>}
+            </Pressable>
+            <Pressable
+              onPress={() => { void handleAdd(); }}
+              disabled={!title.trim() || !calendarId || saving}
+              style={[styles.addBtn, (!title.trim() || saving) && styles.addBtnDisabled]}
+            >
+              <Plus size={18} color={c.primaryForeground} />
+            </Pressable>
+          </View>
+
+          {writableCalendars.length > 1 && (
+            <ScrollView
+              horizontal
+              showsHorizontalScrollIndicator={false}
+              contentContainerStyle={styles.calChips}
+            >
+              {writableCalendars.map((cal) => (
+                <Pressable
+                  key={cal.id}
+                  onPress={() => setCalendarId(cal.id)}
+                  style={[styles.calChip, cal.id === calendarId && styles.calChipActive]}
+                >
+                  <View style={[styles.calSwatch, { backgroundColor: getCalendarColor(cal) }]} />
+                  <Text style={styles.calChipText} numberOfLines={1}>{cal.name}</Text>
+                </Pressable>
+              ))}
+            </ScrollView>
+          )}
+
+          <ScrollView style={styles.list} contentContainerStyle={styles.listContent}>
+            {sorted.length === 0 ? (
+              <View style={styles.empty}>
+                <ListChecks size={32} color={c.surfaceActive} />
+                <Text style={styles.emptyText}>No tasks yet</Text>
+              </View>
+            ) : (
+              sorted.map((task) => {
+                const completed = isCompleted(task);
+                const due = dueLabel(task);
+                return (
+                  <View key={task.id} style={styles.taskRow}>
+                    <Pressable
+                      onPress={() => { void onToggle(task.id); }}
+                      style={[styles.checkbox, completed && styles.checkboxChecked]}
+                      hitSlop={8}
+                    >
+                      {completed && <Check size={14} color={c.primaryForeground} />}
+                    </Pressable>
+                    <View style={styles.taskText}>
+                      <Text style={[styles.taskTitle, completed && styles.taskTitleDone]} numberOfLines={2}>
+                        {task.title || 'Untitled task'}
+                      </Text>
+                      {due && <Text style={styles.taskDue}>{due}</Text>}
+                    </View>
+                    <Pressable onPress={() => { void onDelete(task.id); }} hitSlop={8} style={styles.taskDelete}>
+                      <Trash2 size={16} color={c.textMuted} />
+                    </Pressable>
+                  </View>
+                );
+              })
+            )}
+          </ScrollView>
+        </SafeAreaView>
+      </Animated.View>
+
+      {showDuePicker && (
+        <DateTimePicker
+          value={due ?? new Date()}
+          mode="date"
+          display={Platform.OS === 'ios' ? 'spinner' : 'default'}
+          onChange={(_, d) => {
+            setShowDuePicker(false);
+            if (d) setDue(d);
+          }}
+        />
+      )}
+    </Modal>
+  );
+}
+
+function makeStyles(c: ThemePalette) {
+  return StyleSheet.create({
+    overlay: { ...StyleSheet.absoluteFillObject, backgroundColor: 'rgba(0,0,0,0.5)' },
+    overlayPress: { flex: 1 },
+    sheet: {
+      position: 'absolute',
+      left: 0,
+      right: 0,
+      bottom: 0,
+      maxHeight: '85%',
+      backgroundColor: c.background,
+      borderTopLeftRadius: radius.xl,
+      borderTopRightRadius: radius.xl,
+      borderTopWidth: 1,
+      borderTopColor: c.border,
+    },
+    sheetSafe: { paddingTop: spacing.sm, flexShrink: 1 },
+    handleHit: { alignItems: 'center', paddingTop: spacing.xs, paddingBottom: spacing.sm },
+    handle: { width: 36, height: 4, borderRadius: 2, backgroundColor: c.surfaceActive },
+
+    header: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      gap: spacing.sm,
+      paddingHorizontal: spacing.lg,
+      paddingBottom: spacing.md,
+    },
+    headerTitle: { flex: 1, ...typography.h3, color: c.text },
+    closeBtn: { padding: 4 },
+
+    addRow: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      gap: spacing.sm,
+      paddingHorizontal: spacing.lg,
+      paddingBottom: spacing.sm,
+    },
+    addInput: {
+      flex: 1,
+      ...typography.body,
+      color: c.text,
+      borderWidth: 1,
+      borderColor: c.border,
+      borderRadius: radius.sm,
+      paddingHorizontal: spacing.md,
+      paddingVertical: spacing.sm,
+      backgroundColor: c.surface,
+    },
+    dueChip: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      gap: 4,
+      paddingHorizontal: spacing.sm,
+      height: 38,
+      borderRadius: radius.sm,
+      borderWidth: 1,
+      borderColor: c.border,
+      backgroundColor: c.surface,
+    },
+    dueChipActive: { borderColor: c.primary, backgroundColor: c.primaryBg },
+    dueChipText: { ...typography.caption, color: c.primary },
+    addBtn: {
+      width: 38,
+      height: 38,
+      borderRadius: radius.sm,
+      backgroundColor: c.primary,
+      alignItems: 'center',
+      justifyContent: 'center',
+    },
+    addBtnDisabled: { opacity: 0.5 },
+
+    calChips: { paddingHorizontal: spacing.lg, paddingBottom: spacing.sm, gap: spacing.sm },
+    calChip: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      gap: spacing.xs,
+      paddingHorizontal: spacing.sm,
+      paddingVertical: spacing.xs,
+      borderRadius: radius.full,
+      borderWidth: 1,
+      borderColor: c.border,
+      maxWidth: 160,
+    },
+    calChipActive: { borderColor: c.primary, backgroundColor: c.primaryBg },
+    calSwatch: { width: 10, height: 10, borderRadius: 5 },
+    calChipText: { ...typography.caption, color: c.text, flexShrink: 1 },
+
+    list: { flexGrow: 0 },
+    listContent: { paddingHorizontal: spacing.lg, paddingBottom: spacing.lg },
+    empty: { alignItems: 'center', paddingVertical: spacing.xxl, gap: spacing.sm },
+    emptyText: { ...typography.body, color: c.textMuted },
+
+    taskRow: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      gap: spacing.md,
+      paddingVertical: spacing.sm,
+      borderBottomWidth: 1,
+      borderBottomColor: c.borderLight,
+    },
+    checkbox: {
+      width: 22,
+      height: 22,
+      borderRadius: radius.xs,
+      borderWidth: 2,
+      borderColor: c.border,
+      alignItems: 'center',
+      justifyContent: 'center',
+    },
+    checkboxChecked: { backgroundColor: c.primary, borderColor: c.primary },
+    taskText: { flex: 1 },
+    taskTitle: { ...typography.body, color: c.text },
+    taskTitleDone: { textDecorationLine: 'line-through', color: c.textMuted },
+    taskDue: { ...typography.caption, color: c.textMuted, marginTop: 2 },
+    taskDelete: { padding: 4 },
+  });
+}

src/components/contacts/AddressBookPickerSheet.tsx

@@ -0,0 +1,218 @@
+import React from 'react';
+import {
+  View, Text, StyleSheet, ScrollView, Pressable, Modal, Animated, Easing, TextInput, Alert,
+} from 'react-native';
+import { useSafeAreaInsets } from 'react-native-safe-area-context';
+import { BookUser, X, Check, Plus } from 'lucide-react-native';
+import { spacing, radius, typography, componentSizes, type ThemePalette } from '../../theme/tokens';
+import { useColors } from '../../theme/colors';
+import { useSheetDrag } from '../../lib/use-sheet-drag';
+import { useContactsStore } from '../../stores/contacts-store';
+
+interface Props {
+  visible: boolean;
+  onClose: () => void;
+  /** Book the contact(s) currently live in - shown with a check, not selectable. */
+  currentBookId?: string | null;
+  onPick: (addressBookId: string) => void;
+  title?: string;
+}
+
+export default function AddressBookPickerSheet({
+  visible, onClose, currentBookId, onPick, title = 'Move to address book',
+}: Props) {
+  const c = useColors();
+  const styles = React.useMemo(() => makeStyles(c), [c]);
+  const insets = useSafeAreaInsets();
+  const addressBooks = useContactsStore((s) => s.addressBooks);
+  const createAddressBook = useContactsStore((s) => s.createAddressBook);
+
+  const [creating, setCreating] = React.useState(false);
+  const [newName, setNewName] = React.useState('');
+  const [busy, setBusy] = React.useState(false);
+
+  const slideY = React.useRef(new Animated.Value(600)).current;
+  const overlayOpacity = React.useRef(new Animated.Value(0)).current;
+  const dragHandlers = useSheetDrag({ slideY, closedY: 600, onClose });
+
+  React.useEffect(() => {
+    if (visible) {
+      setCreating(false);
+      setNewName('');
+      Animated.parallel([
+        Animated.timing(slideY, { toValue: 0, duration: 220, easing: Easing.out(Easing.cubic), useNativeDriver: true }),
+        Animated.timing(overlayOpacity, { toValue: 1, duration: 220, useNativeDriver: true }),
+      ]).start();
+    } else {
+      Animated.parallel([
+        Animated.timing(slideY, { toValue: 600, duration: 180, easing: Easing.in(Easing.cubic), useNativeDriver: true }),
+        Animated.timing(overlayOpacity, { toValue: 0, duration: 180, useNativeDriver: true }),
+      ]).start();
+    }
+  }, [visible, slideY, overlayOpacity]);
+
+  const handleCreate = async () => {
+    const name = newName.trim();
+    if (!name || busy) return;
+    setBusy(true);
+    try {
+      const book = await createAddressBook(name);
+      setCreating(false);
+      setNewName('');
+      onPick(book.id);
+    } catch (err) {
+      Alert.alert('Could not create address book', err instanceof Error ? err.message : 'Unknown error');
+    } finally {
+      setBusy(false);
+    }
+  };
+
+  return (
+    <Modal visible={visible} transparent animationType="none" onRequestClose={onClose} statusBarTranslucent>
+      <Animated.View style={[styles.overlay, { opacity: overlayOpacity }]}>
+        <Pressable style={{ flex: 1 }} onPress={onClose} />
+      </Animated.View>
+      <Animated.View
+        style={[
+          styles.sheet,
+          { paddingBottom: Math.max(insets.bottom, spacing.md), transform: [{ translateY: slideY }] },
+        ]}
+      >
+        <View {...dragHandlers}>
+          <View style={styles.handleHit}>
+            <View style={styles.handle} />
+          </View>
+          <View style={styles.header}>
+            <Text style={styles.title}>{title}</Text>
+            <Pressable onPress={onClose} hitSlop={8} style={styles.close}>
+              <X size={18} color={c.textSecondary} />
+            </Pressable>
+          </View>
+        </View>
+
+        <ScrollView keyboardShouldPersistTaps="handled">
+          {addressBooks.map((book) => {
+            const isCurrent = book.id === currentBookId;
+            const canWrite = book.myRights?.mayWrite !== false;
+            const canTarget = canWrite && !isCurrent;
+            return (
+              <Pressable
+                key={book.id}
+                onPress={canTarget ? () => onPick(book.id) : undefined}
+                disabled={!canTarget}
+                style={({ pressed }) => [styles.row, pressed && canTarget && styles.rowPressed]}
+              >
+                <BookUser size={16} color={canTarget ? c.textSecondary : c.textMuted} />
+                <Text style={[styles.rowLabel, !canTarget && styles.rowLabelDisabled]} numberOfLines={1}>
+                  {book.name}
+                </Text>
+                {isCurrent && <Check size={14} color={c.textMuted} />}
+              </Pressable>
+            );
+          })}
+
+          {creating ? (
+            <View style={styles.createRow}>
+              <TextInput
+                style={styles.createInput}
+                placeholder="New address book name"
+                placeholderTextColor={c.textMuted}
+                value={newName}
+                onChangeText={setNewName}
+                autoFocus
+                returnKeyType="done"
+                onSubmitEditing={() => { void handleCreate(); }}
+              />
+              <Pressable
+                onPress={() => { void handleCreate(); }}
+                disabled={!newName.trim() || busy}
+                style={[styles.createBtn, (!newName.trim() || busy) && styles.createBtnDisabled]}
+                hitSlop={6}
+              >
+                <Check size={16} color={c.primaryForeground} />
+              </Pressable>
+            </View>
+          ) : (
+            <Pressable
+              onPress={() => setCreating(true)}
+              style={({ pressed }) => [styles.row, pressed && styles.rowPressed]}
+            >
+              <Plus size={16} color={c.primary} />
+              <Text style={[styles.rowLabel, { color: c.primary }]}>New address book…</Text>
+            </Pressable>
+          )}
+        </ScrollView>
+      </Animated.View>
+    </Modal>
+  );
+}
+
+function makeStyles(c: ThemePalette) {
+  return StyleSheet.create({
+    overlay: { ...StyleSheet.absoluteFillObject, backgroundColor: 'rgba(0,0,0,0.5)' },
+    sheet: {
+      position: 'absolute',
+      left: 0,
+      right: 0,
+      bottom: 0,
+      maxHeight: '75%',
+      backgroundColor: c.popover,
+      borderTopLeftRadius: radius.lg,
+      borderTopRightRadius: radius.lg,
+      borderTopWidth: 1,
+      borderColor: c.border,
+      paddingTop: spacing.sm,
+    },
+    handleHit: { alignItems: 'center', paddingTop: spacing.xs, paddingBottom: spacing.sm },
+    handle: { width: 36, height: 4, borderRadius: 2, backgroundColor: c.border },
+    header: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      justifyContent: 'space-between',
+      paddingHorizontal: spacing.lg,
+      paddingBottom: spacing.sm,
+      borderBottomWidth: 1,
+      borderBottomColor: c.border,
+    },
+    title: { ...typography.bodySemibold, color: c.text },
+    close: { width: 28, height: 28, alignItems: 'center', justifyContent: 'center', borderRadius: radius.xs },
+    row: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      gap: spacing.sm,
+      paddingHorizontal: spacing.lg,
+      paddingVertical: spacing.sm + 2,
+      minHeight: 44,
+    },
+    rowPressed: { backgroundColor: c.surfaceHover },
+    rowLabel: { ...typography.body, color: c.text, flex: 1 },
+    rowLabelDisabled: { color: c.textMuted },
+    createRow: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      gap: spacing.sm,
+      paddingHorizontal: spacing.lg,
+      paddingVertical: spacing.sm,
+    },
+    createInput: {
+      flex: 1,
+      ...typography.body,
+      color: c.text,
+      height: componentSizes.inputHeight,
+      paddingHorizontal: spacing.md,
+      borderWidth: 1,
+      borderColor: c.border,
+      borderRadius: radius.sm,
+      backgroundColor: c.background,
+    },
+    createBtn: {
+      width: 36,
+      height: 36,
+      alignItems: 'center',
+      justifyContent: 'center',
+      backgroundColor: c.primary,
+      borderRadius: radius.full,
+    },
+    createBtnDisabled: { opacity: 0.4 },
+  });
+}

src/components/contacts/ContactActivity.tsx

@@ -8,8 +8,9 @@ import type { ContactCard, Email, CalendarEvent } from '../../api/types';
 import type { RootStackParamList } from '../../navigation/types';
 import { getEmails, queryEmailsByFilter } from '../../api/email';
 import { useCalendarStore } from '../../stores/calendar-store';
+import { getEventColor } from '../../lib/calendar-utils';
 import SenderAvatar from '../SenderAvatar';
-import { radius, spacing, typography, type ThemePalette } from '../../theme/tokens';
+import { radius, spacing, typography, componentSizes, type ThemePalette } from '../../theme/tokens';
 import { useColors } from '../../theme/colors';
 
 const EMAIL_LIMIT = 5;
@@ -87,6 +88,7 @@ export function ContactActivity({ contact }: Props) {
   const styles = React.useMemo(() => makeStyles(c), [c]);
   const navigation = useNavigation<Nav>();
   const calendarEvents = useCalendarStore((s) => s.events);
+  const calendars = useCalendarStore((s) => s.calendars);
 
   const addresses = React.useMemo(() => getContactEmails(contact), [contact]);
   const addressKey = addresses.join(',');
@@ -145,74 +147,85 @@ export function ContactActivity({ contact }: Props) {
     <View style={styles.wrap}>
       <View style={styles.section}>
         <View style={styles.sectionHeader}>
-          <MailIcon size={14} color={c.primary} />
-          <Text style={styles.sectionTitle}>Recent emails</Text>
-        </View>
-        {emailsLoading ? (
-          <View style={styles.loading}>
-            <ActivityIndicator size="small" color={c.primary} />
+          <View style={styles.sectionIcon}>
+            <MailIcon size={16} color={c.textMuted} />
           </View>
-        ) : emailsError ? (
-          <Text style={styles.emptyText}>Couldn't load emails.</Text>
-        ) : !emails || emails.length === 0 ? (
-          <Text style={styles.emptyText}>No emails with this contact.</Text>
-        ) : (
-          emails.map((email) => {
-            const sender = email.from?.[0];
-            const senderName = sender?.name || sender?.email || 'Unknown';
-            return (
-              <Pressable
-                key={email.id}
-                onPress={() =>
-                  navigation.navigate('EmailThread', {
-                    emailId: email.id,
-                    threadId: email.threadId,
-                    subject: email.subject ?? undefined,
-                  })
-                }
-                style={({ pressed }) => [styles.row, pressed && styles.rowPressed]}
-              >
-                <SenderAvatar name={senderName} email={sender?.email} size={32} />
-                <View style={styles.rowContent}>
-                  <View style={styles.rowTop}>
-                    <Text style={styles.rowSender} numberOfLines={1}>{senderName}</Text>
-                    <Text style={styles.rowDate}>{formatRelativeDate(email.receivedAt)}</Text>
+          <Text style={styles.sectionLabel}>Recent emails</Text>
+        </View>
+        <View style={styles.sectionBody}>
+          {emailsLoading ? (
+            <View style={styles.loading}>
+              <ActivityIndicator size="small" color={c.primary} />
+            </View>
+          ) : emailsError ? (
+            <Text style={styles.emptyText}>Couldn't load emails.</Text>
+          ) : !emails || emails.length === 0 ? (
+            <Text style={styles.emptyText}>No emails with this contact.</Text>
+          ) : (
+            emails.map((email) => {
+              const sender = email.from?.[0];
+              const senderName = sender?.name || sender?.email || 'Unknown';
+              return (
+                <Pressable
+                  key={email.id}
+                  onPress={() =>
+                    navigation.navigate('EmailThread', {
+                      emailId: email.id,
+                      threadId: email.threadId,
+                      subject: email.subject ?? undefined,
+                    })
+                  }
+                  style={({ pressed }) => [styles.row, pressed && styles.rowPressed]}
+                >
+                  <SenderAvatar name={senderName} email={sender?.email} size={32} />
+                  <View style={styles.rowContent}>
+                    <View style={styles.rowTop}>
+                      <Text style={styles.rowSender} numberOfLines={1}>{senderName}</Text>
+                      <Text style={styles.rowDate}>{formatRelativeDate(email.receivedAt)}</Text>
+                    </View>
+                    <Text style={styles.rowSubject} numberOfLines={1}>
+                      {email.subject || '(no subject)'}
+                    </Text>
+                    {email.preview ? (
+                      <Text style={styles.rowPreview} numberOfLines={1}>{email.preview}</Text>
+                    ) : null}
                   </View>
-                  <Text style={styles.rowSubject} numberOfLines={1}>
-                    {email.subject || '(no subject)'}
-                  </Text>
-                  {email.preview ? (
-                    <Text style={styles.rowPreview} numberOfLines={1}>{email.preview}</Text>
-                  ) : null}
-                </View>
-              </Pressable>
-            );
-          })
-        )}
+                </Pressable>
+              );
+            })
+          )}
+        </View>
       </View>
 
       <View style={styles.section}>
         <View style={styles.sectionHeader}>
-          <CalendarDays size={14} color={c.primary} />
-          <Text style={styles.sectionTitle}>Upcoming events</Text>
+          <View style={styles.sectionIcon}>
+            <CalendarDays size={16} color={c.textMuted} />
+          </View>
+          <Text style={styles.sectionLabel}>Upcoming events</Text>
         </View>
-        {upcomingEvents.length === 0 ? (
-          <Text style={styles.emptyText}>No upcoming events.</Text>
-        ) : (
-          upcomingEvents.map((event) => (
-            <View key={event.id} style={styles.eventRow}>
-              <Text style={styles.eventTime}>{formatEventTime(event)}</Text>
-              <View style={styles.eventInfo}>
-                <Text style={styles.eventTitle} numberOfLines={1}>
-                  {event.title || '(no title)'}
-                </Text>
-                <Text style={styles.eventDate}>
-                  {formatRelativeDate(event.utcStart || event.start)}
-                </Text>
+        <View style={styles.sectionBody}>
+          {upcomingEvents.length === 0 ? (
+            <Text style={styles.emptyText}>No upcoming events.</Text>
+          ) : (
+            upcomingEvents.map((event) => (
+              <View key={event.id} style={styles.eventRow}>
+                <View
+                  style={[styles.eventDot, { backgroundColor: getEventColor(event, calendars) }]}
+                />
+                <Text style={styles.eventTime}>{formatEventTime(event)}</Text>
+                <View style={styles.eventInfo}>
+                  <Text style={styles.eventTitle} numberOfLines={1}>
+                    {event.title || '(no title)'}
+                  </Text>
+                  <Text style={styles.eventDate}>
+                    {formatRelativeDate(event.utcStart || event.start)}
+                  </Text>
+                </View>
               </View>
-            </View>
-          ))
-        )}
+            ))
+          )}
+        </View>
       </View>
     </View>
   );
@@ -220,18 +233,18 @@ export function ContactActivity({ contact }: Props) {
 
 function makeStyles(c: ThemePalette) {
   return StyleSheet.create({
-  wrap: { gap: spacing.md, paddingHorizontal: spacing.lg, marginBottom: spacing.lg },
-  section: {
-    backgroundColor: c.card,
-    borderRadius: radius.sm,
-    paddingHorizontal: spacing.md,
-    paddingVertical: spacing.sm,
-    gap: spacing.sm,
-    borderLeftWidth: 3,
-    borderLeftColor: c.primary,
+  wrap: { gap: spacing.lg },
+  section: { gap: spacing.sm },
+  sectionHeader: { flexDirection: 'row', alignItems: 'center', gap: spacing.sm },
+  sectionIcon: { width: 16 },
+  sectionLabel: {
+    ...typography.bodyMedium,
+    color: c.textSecondary,
+    textTransform: 'uppercase',
+    fontSize: 11,
+    letterSpacing: 0.6,
   },
-  sectionHeader: { flexDirection: 'row', alignItems: 'center', gap: spacing.xs },
-  sectionTitle: { ...typography.bodySemibold, color: c.text },
+  sectionBody: { paddingLeft: spacing.lg + spacing.xs, gap: spacing.xs },
   loading: { paddingVertical: spacing.sm, alignItems: 'flex-start' },
   emptyText: { ...typography.caption, color: c.textMuted },
 
@@ -251,10 +264,16 @@ function makeStyles(c: ThemePalette) {
   rowPreview: { ...typography.caption, color: c.textMuted },
 
   eventRow: { flexDirection: 'row', gap: spacing.sm, alignItems: 'baseline', paddingVertical: 4 },
+  eventDot: {
+    width: componentSizes.eventDot,
+    height: componentSizes.eventDot,
+    borderRadius: componentSizes.eventDot / 2,
+    alignSelf: 'center',
+  },
   eventTime: {
     ...typography.caption,
     color: c.textMuted,
-    width: 64,
+    width: 52,
   },
   eventInfo: { flex: 1, minWidth: 0 },
   eventTitle: { ...typography.body, color: c.text },

src/components/contacts/ContactImportSheet.tsx

@@ -0,0 +1,391 @@
+import React from 'react';
+import {
+  View, Text, StyleSheet, ScrollView, Pressable, Modal, Animated, Easing, Alert, ActivityIndicator,
+} from 'react-native';
+import { SafeAreaView, useSafeAreaInsets } from 'react-native-safe-area-context';
+import * as FileSystem from 'expo-file-system/legacy';
+import { Upload, X, Check, FileText, AlertTriangle, BookUser } from 'lucide-react-native';
+import type { ContactCard } from '../../api/types';
+import { parseVCard, detectDuplicates } from '../../lib/vcard';
+import { getContactDisplayName, getContactPrimaryEmail } from '../../lib/contact-utils';
+import { useContactsStore } from '../../stores/contacts-store';
+import Button from '../Button';
+import { spacing, radius, typography, type ThemePalette } from '../../theme/tokens';
+import { useColors } from '../../theme/colors';
+
+// expo-document-picker is loaded lazily on first use; its native module is not
+// linked into every build (matches the FilesScreen upload flow).
+type DocumentPickerModule = typeof import('expo-document-picker');
+let documentPickerModule: DocumentPickerModule | null = null;
+function loadDocumentPicker(): DocumentPickerModule | null {
+  if (documentPickerModule) return documentPickerModule;
+  try {
+    documentPickerModule = require('expo-document-picker') as DocumentPickerModule;
+    return documentPickerModule;
+  } catch {
+    return null;
+  }
+}
+
+interface Props {
+  visible: boolean;
+  onClose: () => void;
+  /** Address book the imported contacts are created in. */
+  targetBookId: string | null;
+  targetBookName?: string;
+  onChangeTarget?: () => void;
+  onImported?: (count: number) => void;
+}
+
+export default function ContactImportSheet({
+  visible, onClose, targetBookId, targetBookName, onChangeTarget, onImported,
+}: Props) {
+  const c = useColors();
+  const styles = React.useMemo(() => makeStyles(c), [c]);
+  const insets = useSafeAreaInsets();
+  const existing = useContactsStore((s) => s.contacts);
+  const importContacts = useContactsStore((s) => s.importContacts);
+
+  const [parsed, setParsed] = React.useState<ContactCard[]>([]);
+  const [selected, setSelected] = React.useState<Set<number>>(new Set());
+  const [duplicates, setDuplicates] = React.useState<Map<number, string>>(new Map());
+  const [error, setError] = React.useState<string | null>(null);
+  const [importing, setImporting] = React.useState(false);
+  const [result, setResult] = React.useState<number | null>(null);
+
+  const slideY = React.useRef(new Animated.Value(900)).current;
+  const overlayOpacity = React.useRef(new Animated.Value(0)).current;
+
+  const resetState = React.useCallback(() => {
+    setParsed([]);
+    setSelected(new Set());
+    setDuplicates(new Map());
+    setError(null);
+    setImporting(false);
+    setResult(null);
+  }, []);
+
+  React.useEffect(() => {
+    if (visible) {
+      resetState();
+      Animated.parallel([
+        Animated.timing(slideY, { toValue: 0, duration: 240, easing: Easing.out(Easing.cubic), useNativeDriver: true }),
+        Animated.timing(overlayOpacity, { toValue: 1, duration: 240, useNativeDriver: true }),
+      ]).start();
+    } else {
+      Animated.parallel([
+        Animated.timing(slideY, { toValue: 900, duration: 200, easing: Easing.in(Easing.cubic), useNativeDriver: true }),
+        Animated.timing(overlayOpacity, { toValue: 0, duration: 200, useNativeDriver: true }),
+      ]).start();
+    }
+  }, [visible, slideY, overlayOpacity, resetState]);
+
+  const pickFile = async () => {
+    const picker = loadDocumentPicker();
+    if (!picker) {
+      Alert.alert(
+        'Import unavailable',
+        'The file picker is not installed in this build. Rebuild the app (expo run:android) to enable importing.',
+      );
+      return;
+    }
+    setError(null);
+    let res;
+    try {
+      res = await picker.getDocumentAsync({ copyToCacheDirectory: true, multiple: false });
+    } catch (e) {
+      setError(e instanceof Error ? e.message : 'Could not open the file picker');
+      return;
+    }
+    if (res.canceled || res.assets.length === 0) return;
+    const asset = res.assets[0];
+
+    if (asset.size && asset.size > 5 * 1024 * 1024) {
+      setError('That file is too large (max 5 MB).');
+      return;
+    }
+
+    try {
+      const text = await FileSystem.readAsStringAsync(asset.uri);
+      const contacts = parseVCard(text);
+      if (contacts.length === 0) {
+        setError('No contacts were found in that file.');
+        return;
+      }
+      const dupes = detectDuplicates(existing, contacts);
+      const initial = new Set<number>();
+      contacts.forEach((_, idx) => { if (!dupes.has(idx)) initial.add(idx); });
+      setParsed(contacts);
+      setDuplicates(dupes);
+      setSelected(initial);
+    } catch (e) {
+      setError(e instanceof Error ? e.message : 'Could not read or parse that file.');
+    }
+  };
+
+  const toggle = (idx: number) => {
+    setSelected((prev) => {
+      const next = new Set(prev);
+      if (next.has(idx)) next.delete(idx);
+      else next.add(idx);
+      return next;
+    });
+  };
+
+  const selectAll = () => setSelected(new Set(parsed.map((_, i) => i)));
+  const selectNone = () => setSelected(new Set());
+
+  const doImport = async () => {
+    if (!targetBookId) {
+      Alert.alert('No address book', 'Create an address book before importing contacts.');
+      return;
+    }
+    const toImport = parsed.filter((_, i) => selected.has(i));
+    if (toImport.length === 0) return;
+    setImporting(true);
+    try {
+      const count = await importContacts(toImport, targetBookId);
+      setResult(count);
+      onImported?.(count);
+    } catch (e) {
+      setError(e instanceof Error ? e.message : 'Import failed.');
+    } finally {
+      setImporting(false);
+    }
+  };
+
+  return (
+    <Modal visible={visible} transparent animationType="none" onRequestClose={onClose} statusBarTranslucent>
+      <Animated.View style={[styles.overlay, { opacity: overlayOpacity }]}>
+        <Pressable style={{ flex: 1 }} onPress={onClose} />
+      </Animated.View>
+      <Animated.View style={[styles.sheet, { transform: [{ translateY: slideY }] }]}>
+        <SafeAreaView edges={['bottom']} style={{ flex: 1 }}>
+          <View style={styles.header}>
+            <Text style={styles.title}>Import contacts</Text>
+            <Pressable onPress={onClose} hitSlop={8} style={styles.close}>
+              <X size={20} color={c.text} />
+            </Pressable>
+          </View>
+
+          {result !== null ? (
+            <View style={styles.center}>
+              <View style={styles.successBadge}>
+                <Check size={26} color={c.primaryForeground} />
+              </View>
+              <Text style={styles.successText}>
+                Imported {result} contact{result === 1 ? '' : 's'}.
+              </Text>
+              <Button variant="outline" size="sm" onPress={onClose}>Done</Button>
+            </View>
+          ) : parsed.length === 0 ? (
+            <View style={styles.center}>
+              <Pressable style={styles.dropZone} onPress={() => { void pickFile(); }}>
+                <Upload size={32} color={c.textMuted} />
+                <Text style={styles.dropTitle}>Choose a vCard file</Text>
+                <Text style={styles.dropHint}>.vcf / .vcard — single or multiple contacts</Text>
+              </Pressable>
+              {!!error && (
+                <View style={styles.errorBox}>
+                  <AlertTriangle size={16} color={c.error} />
+                  <Text style={styles.errorText}>{error}</Text>
+                </View>
+              )}
+            </View>
+          ) : (
+            <>
+              <Pressable
+                style={styles.targetRow}
+                onPress={onChangeTarget}
+                disabled={!onChangeTarget}
+              >
+                <BookUser size={16} color={c.textSecondary} />
+                <Text style={styles.targetText} numberOfLines={1}>
+                  Import into {targetBookName || 'address book'}
+                </Text>
+                {onChangeTarget && <Text style={styles.targetChange}>Change</Text>}
+              </Pressable>
+
+              <View style={styles.toolbar}>
+                <Text style={styles.toolbarCount}>
+                  {parsed.length} found · {selected.size} selected
+                </Text>
+                <View style={{ flexDirection: 'row', gap: spacing.md }}>
+                  <Pressable onPress={selectAll} hitSlop={6}>
+                    <Text style={styles.link}>All</Text>
+                  </Pressable>
+                  <Pressable onPress={selectNone} hitSlop={6}>
+                    <Text style={styles.link}>None</Text>
+                  </Pressable>
+                </View>
+              </View>
+
+              <ScrollView style={{ flex: 1 }}>
+                {parsed.map((contact, idx) => {
+                  const name = getContactDisplayName(contact);
+                  const email = getContactPrimaryEmail(contact);
+                  const isDupe = duplicates.has(idx);
+                  const isSelected = selected.has(idx);
+                  return (
+                    <Pressable
+                      key={idx}
+                      onPress={() => toggle(idx)}
+                      style={({ pressed }) => [styles.row, pressed && styles.rowPressed]}
+                    >
+                      <View style={[styles.checkbox, isSelected && styles.checkboxOn]}>
+                        {isSelected && <Check size={13} color={c.primaryForeground} />}
+                      </View>
+                      <FileText size={16} color={c.textMuted} />
+                      <View style={{ flex: 1, minWidth: 0 }}>
+                        <Text style={styles.rowName} numberOfLines={1}>{name || email || '—'}</Text>
+                        {!!email && !!name && (
+                          <Text style={styles.rowEmail} numberOfLines={1}>{email}</Text>
+                        )}
+                      </View>
+                      {isDupe && (
+                        <Text style={styles.dupeBadge}>Duplicate</Text>
+                      )}
+                    </Pressable>
+                  );
+                })}
+              </ScrollView>
+
+              {!!error && (
+                <View style={styles.errorBox}>
+                  <AlertTriangle size={16} color={c.error} />
+                  <Text style={styles.errorText}>{error}</Text>
+                </View>
+              )}
+
+              <View style={[styles.footer, { paddingBottom: Math.max(insets.bottom, spacing.md) }]}>
+                <Button variant="outline" onPress={onClose} disabled={importing}>Cancel</Button>
+                <Button
+                  onPress={() => { void doImport(); }}
+                  disabled={importing || selected.size === 0}
+                  icon={importing ? <ActivityIndicator size="small" color={c.primaryForeground} /> : undefined}
+                >
+                  {importing ? 'Importing…' : `Import ${selected.size}`}
+                </Button>
+              </View>
+            </>
+          )}
+        </SafeAreaView>
+      </Animated.View>
+    </Modal>
+  );
+}
+
+function makeStyles(c: ThemePalette) {
+  return StyleSheet.create({
+    overlay: { ...StyleSheet.absoluteFillObject, backgroundColor: 'rgba(0,0,0,0.5)' },
+    sheet: {
+      position: 'absolute',
+      left: 0,
+      right: 0,
+      bottom: 0,
+      height: '85%',
+      backgroundColor: c.popover,
+      borderTopLeftRadius: radius.lg,
+      borderTopRightRadius: radius.lg,
+      borderTopWidth: 1,
+      borderColor: c.border,
+    },
+    header: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      justifyContent: 'space-between',
+      paddingHorizontal: spacing.lg,
+      paddingVertical: spacing.md,
+      borderBottomWidth: 1,
+      borderBottomColor: c.border,
+    },
+    title: { ...typography.h3, color: c.text },
+    close: { width: 36, height: 36, alignItems: 'center', justifyContent: 'center', borderRadius: radius.sm },
+    center: { flex: 1, alignItems: 'center', justifyContent: 'center', gap: spacing.lg, padding: spacing.xl },
+    dropZone: {
+      width: '100%',
+      borderWidth: 2,
+      borderColor: c.border,
+      borderStyle: 'dashed',
+      borderRadius: radius.lg,
+      paddingVertical: spacing.xxxl,
+      alignItems: 'center',
+      gap: spacing.sm,
+    },
+    dropTitle: { ...typography.bodyMedium, color: c.text },
+    dropHint: { ...typography.caption, color: c.textMuted },
+    successBadge: {
+      width: 56, height: 56, borderRadius: radius.full,
+      backgroundColor: c.primary, alignItems: 'center', justifyContent: 'center',
+    },
+    successText: { ...typography.bodyMedium, color: c.text },
+    targetRow: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      gap: spacing.sm,
+      paddingHorizontal: spacing.lg,
+      paddingVertical: spacing.sm,
+      borderBottomWidth: 1,
+      borderBottomColor: c.borderLight,
+    },
+    targetText: { ...typography.caption, color: c.textSecondary, flex: 1 },
+    targetChange: { ...typography.captionMedium, color: c.primary },
+    toolbar: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      justifyContent: 'space-between',
+      paddingHorizontal: spacing.lg,
+      paddingVertical: spacing.sm,
+    },
+    toolbarCount: { ...typography.caption, color: c.textMuted },
+    link: { ...typography.captionMedium, color: c.primary },
+    row: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      gap: spacing.md,
+      paddingHorizontal: spacing.lg,
+      paddingVertical: spacing.sm + 2,
+      minHeight: 48,
+    },
+    rowPressed: { backgroundColor: c.surfaceHover },
+    checkbox: {
+      width: 20, height: 20, borderRadius: radius.xs,
+      borderWidth: 1, borderColor: c.border,
+      alignItems: 'center', justifyContent: 'center',
+    },
+    checkboxOn: { backgroundColor: c.primary, borderColor: c.primary },
+    rowName: { ...typography.body, color: c.text },
+    rowEmail: { ...typography.caption, color: c.textMuted, marginTop: 1 },
+    dupeBadge: {
+      ...typography.small,
+      color: c.warning,
+      backgroundColor: c.warningBg,
+      paddingHorizontal: 6,
+      paddingVertical: 2,
+      borderRadius: radius.xs,
+      overflow: 'hidden',
+    },
+    errorBox: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      gap: spacing.sm,
+      marginHorizontal: spacing.lg,
+      marginTop: spacing.sm,
+      padding: spacing.md,
+      borderRadius: radius.sm,
+      backgroundColor: c.errorBg,
+      borderWidth: 1,
+      borderColor: c.errorBorder,
+    },
+    errorText: { ...typography.caption, color: c.errorForeground, flex: 1 },
+    footer: {
+      flexDirection: 'row',
+      justifyContent: 'flex-end',
+      gap: spacing.md,
+      paddingHorizontal: spacing.lg,
+      paddingTop: spacing.md,
+      borderTopWidth: 1,
+      borderTopColor: c.border,
+    },
+  });
+}

src/components/contacts/TagAssignSheet.tsx

@@ -0,0 +1,195 @@
+import React from 'react';
+import {
+  View, Text, StyleSheet, ScrollView, Pressable, Modal, Animated, Easing, TextInput,
+} from 'react-native';
+import { useSafeAreaInsets } from 'react-native-safe-area-context';
+import { Tag, X, Plus } from 'lucide-react-native';
+import { spacing, radius, typography, componentSizes, type ThemePalette } from '../../theme/tokens';
+import { useColors } from '../../theme/colors';
+import { useSheetDrag } from '../../lib/use-sheet-drag';
+import { useContactsStore, selectKeywordsUsed } from '../../stores/contacts-store';
+
+interface Props {
+  visible: boolean;
+  onClose: () => void;
+  /** Called with the chosen tag (existing or freshly typed). */
+  onPick: (keyword: string) => void;
+  title?: string;
+}
+
+export default function TagAssignSheet({
+  visible, onClose, onPick, title = 'Add tag',
+}: Props) {
+  const c = useColors();
+  const styles = React.useMemo(() => makeStyles(c), [c]);
+  const insets = useSafeAreaInsets();
+  // Subscribe to the stable `contacts` array and derive the keyword list in a
+  // memo. Passing `selectKeywordsUsed` straight to the store would return a
+  // fresh array on every call, which trips useSyncExternalStore's snapshot
+  // check and spins into an infinite render loop.
+  const contacts = useContactsStore((s) => s.contacts);
+  const keywords = React.useMemo(() => selectKeywordsUsed(contacts), [contacts]);
+
+  const [input, setInput] = React.useState('');
+
+  const slideY = React.useRef(new Animated.Value(600)).current;
+  const overlayOpacity = React.useRef(new Animated.Value(0)).current;
+  const dragHandlers = useSheetDrag({ slideY, closedY: 600, onClose });
+
+  React.useEffect(() => {
+    if (visible) {
+      setInput('');
+      Animated.parallel([
+        Animated.timing(slideY, { toValue: 0, duration: 220, easing: Easing.out(Easing.cubic), useNativeDriver: true }),
+        Animated.timing(overlayOpacity, { toValue: 1, duration: 220, useNativeDriver: true }),
+      ]).start();
+    } else {
+      Animated.parallel([
+        Animated.timing(slideY, { toValue: 600, duration: 180, easing: Easing.in(Easing.cubic), useNativeDriver: true }),
+        Animated.timing(overlayOpacity, { toValue: 0, duration: 180, useNativeDriver: true }),
+      ]).start();
+    }
+  }, [visible, slideY, overlayOpacity]);
+
+  const submitNew = () => {
+    const kw = input.trim();
+    if (!kw) return;
+    onPick(kw);
+  };
+
+  return (
+    <Modal visible={visible} transparent animationType="none" onRequestClose={onClose} statusBarTranslucent>
+      <Animated.View style={[styles.overlay, { opacity: overlayOpacity }]}>
+        <Pressable style={{ flex: 1 }} onPress={onClose} />
+      </Animated.View>
+      <Animated.View
+        style={[
+          styles.sheet,
+          { paddingBottom: Math.max(insets.bottom, spacing.md), transform: [{ translateY: slideY }] },
+        ]}
+      >
+        <View {...dragHandlers}>
+          <View style={styles.handleHit}>
+            <View style={styles.handle} />
+          </View>
+          <View style={styles.header}>
+            <Text style={styles.title}>{title}</Text>
+            <Pressable onPress={onClose} hitSlop={8} style={styles.close}>
+              <X size={18} color={c.textSecondary} />
+            </Pressable>
+          </View>
+        </View>
+
+        <View style={styles.inputRow}>
+          <TextInput
+            style={styles.input}
+            placeholder="New tag name"
+            placeholderTextColor={c.textMuted}
+            value={input}
+            onChangeText={setInput}
+            autoCapitalize="none"
+            returnKeyType="done"
+            onSubmitEditing={submitNew}
+          />
+          <Pressable
+            onPress={submitNew}
+            disabled={!input.trim()}
+            style={[styles.addBtn, !input.trim() && styles.addBtnDisabled]}
+            hitSlop={6}
+          >
+            <Plus size={16} color={c.primaryForeground} />
+          </Pressable>
+        </View>
+
+        <ScrollView keyboardShouldPersistTaps="handled">
+          {keywords.length === 0 ? (
+            <Text style={styles.empty}>No tags yet. Type one above.</Text>
+          ) : (
+            keywords.map((kw) => (
+              <Pressable
+                key={kw.keyword}
+                onPress={() => onPick(kw.keyword)}
+                style={({ pressed }) => [styles.row, pressed && styles.rowPressed]}
+              >
+                <Tag size={16} color={c.textSecondary} />
+                <Text style={styles.rowLabel} numberOfLines={1}>{kw.keyword}</Text>
+                <Text style={styles.rowCount}>{kw.count}</Text>
+              </Pressable>
+            ))
+          )}
+        </ScrollView>
+      </Animated.View>
+    </Modal>
+  );
+}
+
+function makeStyles(c: ThemePalette) {
+  return StyleSheet.create({
+    overlay: { ...StyleSheet.absoluteFillObject, backgroundColor: 'rgba(0,0,0,0.5)' },
+    sheet: {
+      position: 'absolute',
+      left: 0,
+      right: 0,
+      bottom: 0,
+      maxHeight: '75%',
+      backgroundColor: c.popover,
+      borderTopLeftRadius: radius.lg,
+      borderTopRightRadius: radius.lg,
+      borderTopWidth: 1,
+      borderColor: c.border,
+      paddingTop: spacing.sm,
+    },
+    handleHit: { alignItems: 'center', paddingTop: spacing.xs, paddingBottom: spacing.sm },
+    handle: { width: 36, height: 4, borderRadius: 2, backgroundColor: c.border },
+    header: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      justifyContent: 'space-between',
+      paddingHorizontal: spacing.lg,
+      paddingBottom: spacing.sm,
+      borderBottomWidth: 1,
+      borderBottomColor: c.border,
+    },
+    title: { ...typography.bodySemibold, color: c.text },
+    close: { width: 28, height: 28, alignItems: 'center', justifyContent: 'center', borderRadius: radius.xs },
+    inputRow: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      gap: spacing.sm,
+      paddingHorizontal: spacing.lg,
+      paddingVertical: spacing.sm,
+    },
+    input: {
+      flex: 1,
+      ...typography.body,
+      color: c.text,
+      height: componentSizes.inputHeight,
+      paddingHorizontal: spacing.md,
+      borderWidth: 1,
+      borderColor: c.border,
+      borderRadius: radius.sm,
+      backgroundColor: c.background,
+    },
+    addBtn: {
+      width: 36,
+      height: 36,
+      alignItems: 'center',
+      justifyContent: 'center',
+      backgroundColor: c.primary,
+      borderRadius: radius.full,
+    },
+    addBtnDisabled: { opacity: 0.4 },
+    empty: { ...typography.caption, color: c.textMuted, textAlign: 'center', paddingVertical: spacing.xl },
+    row: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      gap: spacing.sm,
+      paddingHorizontal: spacing.lg,
+      paddingVertical: spacing.sm + 2,
+      minHeight: 44,
+    },
+    rowPressed: { backgroundColor: c.surfaceHover },
+    rowLabel: { ...typography.body, color: c.text, flex: 1 },
+    rowCount: { ...typography.caption, color: c.textMuted },
+  });
+}

src/components/contacts/index.ts

@@ -1,4 +1,7 @@
+export { default as AddressBookPickerSheet } from './AddressBookPickerSheet';
+export { default as ContactImportSheet } from './ContactImportSheet';
 export { default as ContactListRow } from './ContactListRow';
 export { default as ContactPickerSheet } from './ContactPickerSheet';
 export { default as ContactsSidebarDrawer } from './ContactsSidebarDrawer';
+export { default as TagAssignSheet } from './TagAssignSheet';
 export { default as FieldBlock, FieldRow } from './FieldBlock';

src/components/email/CalendarInvitationBanner.tsx

@@ -0,0 +1,305 @@
+import React from 'react';
+import { View, Text, StyleSheet, Pressable, ActivityIndicator, Linking } from 'react-native';
+import {
+  CalendarPlus, Check, HelpCircle, X, MapPin, Video, Clock, CalendarDays, AlertTriangle,
+} from 'lucide-react-native';
+import { format, parseISO } from 'date-fns';
+import type { Email, CalendarEvent } from '../../api/types';
+import { spacing, radius, typography, type ThemePalette } from '../../theme/tokens';
+import { useColors } from '../../theme/colors';
+import { parseCalendarBlob } from '../../api/calendar';
+import { useCalendarStore } from '../../stores/calendar-store';
+import { useAccountStore } from '../../stores/account-store';
+import { useSettingsStore } from '../../stores/settings-store';
+import {
+  findCalendarAttachment,
+  findParticipantByEmail,
+  getOrganizerName,
+  buildReplyTo,
+  inferInvitationMethod,
+  type InvitationMethod,
+} from '../../lib/calendar-invitation';
+
+type BannerState = 'loading' | 'parsed' | 'done' | 'error';
+type RsvpStatus = 'accepted' | 'tentative' | 'declined';
+
+interface Props {
+  email: Email;
+}
+
+export function CalendarInvitationBanner({ email }: Props) {
+  const c = useColors();
+  const styles = React.useMemo(() => makeStyles(c), [c]);
+  const enabled = useSettingsStore((s) => s.calendarInvitationParsingEnabled);
+  const calendars = useCalendarStore((s) => s.calendars);
+  const importEvents = useCalendarStore((s) => s.importEvents);
+  const rsvpEvent = useCalendarStore((s) => s.rsvpEvent);
+  const activeEmail = useAccountStore((s) => s.getActiveAccount()?.email ?? null);
+
+  const attachment = React.useMemo(() => findCalendarAttachment(email), [email]);
+
+  const [state, setState] = React.useState<BannerState>('loading');
+  const [event, setEvent] = React.useState<Partial<CalendarEvent> | null>(null);
+  const [method, setMethod] = React.useState<InvitationMethod>('unknown');
+  const [rsvpStatus, setRsvpStatus] = React.useState<RsvpStatus | null>(null);
+  const [notice, setNotice] = React.useState<string | null>(null);
+  const [busy, setBusy] = React.useState(false);
+
+  React.useEffect(() => {
+    let cancelled = false;
+    if (!attachment || !enabled) return;
+    setState('loading');
+    (async () => {
+      try {
+        const events = await parseCalendarBlob(attachment.blobId);
+        if (cancelled) return;
+        if (events.length === 0) {
+          setState('error');
+          return;
+        }
+        const parsed = events[0];
+        setEvent(parsed);
+        setMethod(inferInvitationMethod(parsed));
+        setState('parsed');
+      } catch {
+        if (!cancelled) setState('error');
+      }
+    })();
+    return () => { cancelled = true; };
+  }, [attachment, enabled]);
+
+  if (!attachment || !enabled || state === 'error') return null;
+
+  if (state === 'loading') {
+    return (
+      <View style={styles.banner}>
+        <ActivityIndicator size="small" color={c.primary} />
+        <Text style={styles.loadingText}>Reading invitation…</Text>
+      </View>
+    );
+  }
+  if (!event) return null;
+
+  const startStr = event.showWithoutTime ? event.start : (event.utcStart || event.start);
+  const startDate = startStr ? parseISO(startStr) : null;
+  const dateLabel = startDate && !isNaN(startDate.getTime())
+    ? (event.showWithoutTime
+        ? format(startDate, 'EEEE, MMM d, yyyy')
+        : format(startDate, 'EEE, MMM d · HH:mm'))
+    : null;
+  const organizer = getOrganizerName(event);
+  const location = event.locations ? Object.values(event.locations)[0]?.name : undefined;
+  const videoUri = event.virtualLocations ? Object.values(event.virtualLocations)[0]?.uri : undefined;
+  const me = activeEmail ? findParticipantByEmail(event, [activeEmail]) : null;
+  const canRsvp = method !== 'cancel' && method !== 'reply' && !!me;
+
+  const writableCalendar = calendars.find((cal) => !cal.myRights || cal.myRights.mayWrite !== false);
+
+  const ensureImportedAndRsvp = async (status: RsvpStatus) => {
+    if (busy || !writableCalendar) return;
+    setBusy(true);
+    setNotice(null);
+    try {
+      // Make sure the event exists in a local calendar (dedupes by UID).
+      await importEvents([event], writableCalendar.id);
+      // Re-read from the store to get the server-assigned id + participant.
+      const stored = useCalendarStore.getState().events.find((e) => e.uid === event.uid);
+      const participant = stored && activeEmail
+        ? findParticipantByEmail(stored, [activeEmail])
+        : me;
+      if (stored && participant) {
+        await rsvpEvent(stored.id, participant.id, status, buildReplyTo(event));
+        setRsvpStatus(status);
+        setNotice('Response sent');
+      } else {
+        setNotice('Added to calendar');
+      }
+      setState('done');
+    } catch {
+      setNotice('Could not send your response');
+    } finally {
+      setBusy(false);
+    }
+  };
+
+  const handleImport = async () => {
+    if (busy || !writableCalendar) return;
+    setBusy(true);
+    setNotice(null);
+    try {
+      const count = await importEvents([event], writableCalendar.id);
+      setNotice(count > 0 ? 'Added to calendar' : 'Already in your calendar');
+      setState('done');
+    } catch {
+      setNotice('Could not add the event');
+    } finally {
+      setBusy(false);
+    }
+  };
+
+  return (
+    <View style={styles.banner}>
+      <View style={styles.headerRow}>
+        <View style={styles.iconBadge}>
+          <CalendarDays size={18} color={c.primary} />
+        </View>
+        <View style={{ flex: 1, minWidth: 0 }}>
+          <Text style={styles.title} numberOfLines={2}>{event.title || 'Calendar invitation'}</Text>
+          {method === 'cancel' && <Text style={styles.cancelled}>This event was cancelled</Text>}
+        </View>
+      </View>
+
+      {dateLabel && (
+        <Row icon={<Clock size={15} color={c.textMuted} />} text={dateLabel} styles={styles} />
+      )}
+      {location ? (
+        <Row icon={<MapPin size={15} color={c.textMuted} />} text={location} styles={styles} />
+      ) : null}
+      {videoUri ? (
+        <Pressable style={styles.detailRow} onPress={() => { void Linking.openURL(videoUri); }}>
+          <Video size={15} color={c.textMuted} />
+          <Text style={[styles.detailText, { color: c.primary }]} numberOfLines={1}>Join video call</Text>
+        </Pressable>
+      ) : null}
+      {organizer ? (
+        <Row icon={<CalendarPlus size={15} color={c.textMuted} />} text={`Organizer: ${organizer}`} styles={styles} />
+      ) : null}
+
+      {notice && <Text style={styles.notice}>{notice}</Text>}
+
+      {state !== 'done' && (
+        <View style={styles.actions}>
+          {canRsvp ? (
+            <>
+              <RsvpBtn label="Yes" active={rsvpStatus === 'accepted'} activeColor={c.success}
+                icon={<Check size={15} color={rsvpStatus === 'accepted' ? c.textInverse : c.success} />}
+                disabled={busy} onPress={() => ensureImportedAndRsvp('accepted')} c={c} styles={styles} />
+              <RsvpBtn label="Maybe" active={rsvpStatus === 'tentative'} activeColor={c.warning}
+                icon={<HelpCircle size={15} color={rsvpStatus === 'tentative' ? c.textInverse : c.warning} />}
+                disabled={busy} onPress={() => ensureImportedAndRsvp('tentative')} c={c} styles={styles} />
+              <RsvpBtn label="No" active={rsvpStatus === 'declined'} activeColor={c.error}
+                icon={<X size={15} color={rsvpStatus === 'declined' ? c.textInverse : c.error} />}
+                disabled={busy} onPress={() => ensureImportedAndRsvp('declined')} c={c} styles={styles} />
+            </>
+          ) : (
+            <Pressable
+              style={[styles.importBtn, busy && { opacity: 0.5 }]}
+              onPress={() => { void handleImport(); }}
+              disabled={busy}
+            >
+              {busy ? (
+                <ActivityIndicator size="small" color={c.primaryForeground} />
+              ) : (
+                <CalendarPlus size={16} color={c.primaryForeground} />
+              )}
+              <Text style={styles.importBtnText}>Add to calendar</Text>
+            </Pressable>
+          )}
+        </View>
+      )}
+
+      {!writableCalendar && state !== 'done' && (
+        <View style={styles.warnRow}>
+          <AlertTriangle size={14} color={c.warning} />
+          <Text style={styles.warnText}>No writable calendar available</Text>
+        </View>
+      )}
+    </View>
+  );
+}
+
+function Row({
+  icon, text, styles,
+}: {
+  icon: React.ReactNode;
+  text: string;
+  styles: ReturnType<typeof makeStyles>;
+}) {
+  return (
+    <View style={styles.detailRow}>
+      {icon}
+      <Text style={styles.detailText} numberOfLines={2}>{text}</Text>
+    </View>
+  );
+}
+
+function RsvpBtn({
+  label, icon, active, activeColor, disabled, onPress, c, styles,
+}: {
+  label: string;
+  icon: React.ReactNode;
+  active: boolean;
+  activeColor: string;
+  disabled?: boolean;
+  onPress: () => void;
+  c: ThemePalette;
+  styles: ReturnType<typeof makeStyles>;
+}) {
+  return (
+    <Pressable
+      onPress={onPress}
+      disabled={disabled}
+      style={[
+        styles.rsvpBtn,
+        active && { backgroundColor: activeColor, borderColor: activeColor },
+        disabled && { opacity: 0.5 },
+      ]}
+    >
+      {icon}
+      <Text style={[styles.rsvpBtnText, active && { color: c.textInverse }]}>{label}</Text>
+    </Pressable>
+  );
+}
+
+function makeStyles(c: ThemePalette) {
+  return StyleSheet.create({
+    banner: {
+      marginHorizontal: spacing.lg,
+      marginBottom: spacing.md,
+      padding: spacing.md,
+      borderRadius: radius.md,
+      borderWidth: 1,
+      borderColor: c.border,
+      backgroundColor: c.surface,
+      gap: spacing.xs,
+    },
+    loadingText: { ...typography.caption, color: c.textMuted },
+    headerRow: { flexDirection: 'row', alignItems: 'center', gap: spacing.sm, marginBottom: spacing.xs },
+    iconBadge: {
+      width: 32, height: 32, borderRadius: radius.sm,
+      backgroundColor: c.primaryBg, alignItems: 'center', justifyContent: 'center',
+    },
+    title: { ...typography.bodySemibold, color: c.text },
+    cancelled: { ...typography.caption, color: c.error, marginTop: 2 },
+    detailRow: { flexDirection: 'row', alignItems: 'center', gap: spacing.sm, paddingVertical: 2 },
+    detailText: { flex: 1, ...typography.caption, color: c.textSecondary },
+    notice: { ...typography.captionMedium, color: c.primary, marginTop: spacing.xs },
+    actions: { flexDirection: 'row', gap: spacing.sm, marginTop: spacing.sm },
+    rsvpBtn: {
+      flex: 1,
+      flexDirection: 'row',
+      alignItems: 'center',
+      justifyContent: 'center',
+      gap: 4,
+      paddingVertical: spacing.sm,
+      borderRadius: radius.sm,
+      borderWidth: 1,
+      borderColor: c.border,
+      backgroundColor: c.background,
+    },
+    rsvpBtnText: { ...typography.caption, color: c.text },
+    importBtn: {
+      flex: 1,
+      flexDirection: 'row',
+      alignItems: 'center',
+      justifyContent: 'center',
+      gap: spacing.sm,
+      paddingVertical: spacing.sm,
+      borderRadius: radius.sm,
+      backgroundColor: c.primary,
+    },
+    importBtnText: { ...typography.bodyMedium, color: c.primaryForeground },
+    warnRow: { flexDirection: 'row', alignItems: 'center', gap: spacing.xs, marginTop: spacing.xs },
+    warnText: { ...typography.caption, color: c.warning },
+  });
+}

src/components/files/ShareSheet.tsx

@@ -0,0 +1,425 @@
+import React, { useCallback, useEffect, useMemo, useState } from 'react';
+import {
+  ActivityIndicator,
+  Alert,
+  Modal,
+  Pressable,
+  ScrollView,
+  StyleSheet,
+  Text,
+  TextInput,
+  TouchableWithoutFeedback,
+  View,
+} from 'react-native';
+import { Folder, FileText, Trash2, UserPlus, Users } from 'lucide-react-native';
+
+import { getPrincipals, isFolder, ownPrincipalId, setFileNodeShare } from '../../api/files';
+import type { FileNode, FileNodeRights, Principal } from '../../api/types';
+import { spacing, radius, typography, type ThemePalette } from '../../theme/tokens';
+import { useColors } from '../../theme/colors';
+
+type RolePreset = 'read' | 'readWrite' | 'manager';
+
+// Same presets the webmail's share dialog offers (#408). "custom" rights set
+// by another client are shown as-is and left untouched until the user picks a
+// preset for that principal.
+const FILE_PRESETS: Record<RolePreset, FileNodeRights> = {
+  read: {
+    mayRead: true, mayAddChildren: false, mayRename: false,
+    mayDelete: false, mayModifyContent: false, mayShare: false,
+  },
+  readWrite: {
+    mayRead: true, mayAddChildren: true, mayRename: true,
+    mayDelete: true, mayModifyContent: true, mayShare: false,
+  },
+  manager: {
+    mayRead: true, mayAddChildren: true, mayRename: true,
+    mayDelete: true, mayModifyContent: true, mayShare: true,
+  },
+};
+
+const PRESET_LABELS: Record<RolePreset, string> = {
+  read: 'Viewer',
+  readWrite: 'Editor',
+  manager: 'Manager',
+};
+
+const PRESET_ORDER: RolePreset[] = ['read', 'readWrite', 'manager'];
+
+function detectPreset(rights: FileNodeRights): RolePreset | 'custom' {
+  for (const preset of PRESET_ORDER) {
+    const expected = FILE_PRESETS[preset];
+    const keys = Object.keys(expected) as (keyof FileNodeRights)[];
+    if (keys.every((k) => expected[k] === (rights[k] ?? false))) return preset;
+  }
+  return 'custom';
+}
+
+interface ShareSheetProps {
+  node: FileNode | null;
+  onClose: () => void;
+  /** Fired after any successful share change so the parent can refresh. */
+  onChanged: () => void;
+}
+
+export default function ShareSheet({ node, onClose, onChanged }: ShareSheetProps) {
+  const c = useColors();
+  const styles = React.useMemo(() => makeStyles(c), [c]);
+
+  const [principals, setPrincipals] = useState<Principal[]>([]);
+  const [loadingPrincipals, setLoadingPrincipals] = useState(false);
+  const [shares, setShares] = useState<Record<string, FileNodeRights>>({});
+  const [search, setSearch] = useState('');
+  const [savingId, setSavingId] = useState<string | null>(null);
+
+  useEffect(() => {
+    if (!node) return;
+    setShares(node.shareWith ?? {});
+    setSearch('');
+    setLoadingPrincipals(true);
+    getPrincipals()
+      .then(setPrincipals)
+      .catch(() => setPrincipals([]))
+      .finally(() => setLoadingPrincipals(false));
+  }, [node]);
+
+  const principalsById = useMemo(() => {
+    const map = new Map<string, Principal>();
+    for (const p of principals) map.set(p.id, p);
+    return map;
+  }, [principals]);
+
+  const sharedEntries = useMemo(
+    () => Object.entries(shares).filter(([, rights]) => rights != null),
+    [shares],
+  );
+
+  const candidates = useMemo(() => {
+    const self = ownPrincipalId();
+    const q = search.trim().toLowerCase();
+    return principals
+      .filter((p) => p.id !== self && shares[p.id] == null)
+      .filter((p) =>
+        !q ||
+        p.name?.toLowerCase().includes(q) ||
+        p.email?.toLowerCase().includes(q) ||
+        p.description?.toLowerCase().includes(q))
+      .slice(0, 25);
+  }, [principals, shares, search]);
+
+  const applyShare = useCallback(
+    async (principalId: string, rights: FileNodeRights | null) => {
+      if (!node || savingId) return;
+      setSavingId(principalId);
+      try {
+        await setFileNodeShare(node.id, principalId, rights);
+        setShares((prev) => {
+          const next = { ...prev };
+          if (rights == null) delete next[principalId];
+          else next[principalId] = rights;
+          return next;
+        });
+        onChanged();
+      } catch (e) {
+        Alert.alert('Sharing failed', e instanceof Error ? e.message : String(e));
+      } finally {
+        setSavingId(null);
+      }
+    },
+    [node, savingId, onChanged],
+  );
+
+  if (!node) return null;
+  const Icon = isFolder(node) ? Folder : FileText;
+
+  const renderPrincipalLabel = (principalId: string) => {
+    const p = principalsById.get(principalId);
+    return (
+      <View style={styles.principalInfo}>
+        <Text style={styles.principalName} numberOfLines={1}>
+          {p?.description || p?.name || principalId}
+        </Text>
+        {p?.email ? (
+          <Text style={styles.principalEmail} numberOfLines={1}>
+            {p.email}
+          </Text>
+        ) : null}
+      </View>
+    );
+  };
+
+  return (
+    <Modal visible transparent animationType="slide" onRequestClose={onClose}>
+      <TouchableWithoutFeedback onPress={onClose}>
+        <View style={styles.backdrop}>
+          <TouchableWithoutFeedback>
+            <View style={styles.sheet}>
+              <View style={styles.titleRow}>
+                <Icon size={18} color={c.textMuted} />
+                <Text style={styles.title} numberOfLines={1}>
+                  Share “{node.name}”
+                </Text>
+              </View>
+              {isFolder(node) ? (
+                <Text style={styles.subtitle}>
+                  Sharing a folder shares everything inside it.
+                </Text>
+              ) : null}
+
+              <ScrollView
+                style={styles.scroll}
+                keyboardShouldPersistTaps="handled"
+              >
+                {sharedEntries.length > 0 ? (
+                  <View style={styles.section}>
+                    <Text style={styles.sectionLabel}>Shared with</Text>
+                    {sharedEntries.map(([principalId, rights]) => {
+                      const preset = detectPreset(rights);
+                      const busy = savingId === principalId;
+                      return (
+                        <View key={principalId} style={styles.shareRow}>
+                          {renderPrincipalLabel(principalId)}
+                          <View style={styles.roleChips}>
+                            {PRESET_ORDER.map((p) => (
+                              <Pressable
+                                key={p}
+                                onPress={() => void applyShare(principalId, FILE_PRESETS[p])}
+                                disabled={busy}
+                                style={[styles.chip, preset === p && styles.chipActive]}
+                              >
+                                <Text
+                                  style={[styles.chipText, preset === p && styles.chipTextActive]}
+                                >
+                                  {PRESET_LABELS[p]}
+                                </Text>
+                              </Pressable>
+                            ))}
+                            {preset === 'custom' ? (
+                              <Text style={styles.customLabel}>Custom</Text>
+                            ) : null}
+                          </View>
+                          {busy ? (
+                            <ActivityIndicator size="small" color={c.textMuted} />
+                          ) : (
+                            <Pressable
+                              onPress={() => void applyShare(principalId, null)}
+                              hitSlop={8}
+                              accessibilityLabel="Remove access"
+                            >
+                              <Trash2 size={18} color={c.error} />
+                            </Pressable>
+                          )}
+                        </View>
+                      );
+                    })}
+                  </View>
+                ) : (
+                  <View style={styles.emptyRow}>
+                    <Users size={18} color={c.textMuted} />
+                    <Text style={styles.emptyText}>Not shared with anyone yet</Text>
+                  </View>
+                )}
+
+                <View style={styles.section}>
+                  <Text style={styles.sectionLabel}>Add people</Text>
+                  <TextInput
+                    value={search}
+                    onChangeText={setSearch}
+                    placeholder="Search by name or email"
+                    placeholderTextColor={c.textMuted}
+                    style={styles.input}
+                    autoCapitalize="none"
+                    autoCorrect={false}
+                  />
+                  {loadingPrincipals ? (
+                    <ActivityIndicator
+                      size="small"
+                      color={c.textMuted}
+                      style={{ marginTop: spacing.sm }}
+                    />
+                  ) : candidates.length === 0 ? (
+                    <Text style={styles.noMatches}>
+                      {principals.length === 0 ? 'No other users found' : 'No matches'}
+                    </Text>
+                  ) : (
+                    candidates.map((p) => (
+                      <Pressable
+                        key={p.id}
+                        onPress={() => void applyShare(p.id, FILE_PRESETS.read)}
+                        disabled={savingId != null}
+                        style={({ pressed }) => [
+                          styles.candidateRow,
+                          pressed && { backgroundColor: c.surfaceHover },
+                        ]}
+                      >
+                        {renderPrincipalLabel(p.id)}
+                        {savingId === p.id ? (
+                          <ActivityIndicator size="small" color={c.textMuted} />
+                        ) : (
+                          <UserPlus size={18} color={c.primary} />
+                        )}
+                      </Pressable>
+                    ))
+                  )}
+                </View>
+              </ScrollView>
+
+              <Pressable onPress={onClose} style={styles.doneBtn}>
+                <Text style={styles.doneText}>Done</Text>
+              </Pressable>
+            </View>
+          </TouchableWithoutFeedback>
+        </View>
+      </TouchableWithoutFeedback>
+    </Modal>
+  );
+}
+
+function makeStyles(c: ThemePalette) {
+  return StyleSheet.create({
+    backdrop: {
+      flex: 1,
+      backgroundColor: 'rgba(0,0,0,0.5)',
+      justifyContent: 'flex-end',
+    },
+    sheet: {
+      backgroundColor: c.background,
+      borderTopLeftRadius: radius.lg,
+      borderTopRightRadius: radius.lg,
+      paddingTop: spacing.md,
+      paddingBottom: spacing.xxl,
+      paddingHorizontal: spacing.md,
+      maxHeight: '80%',
+    },
+    titleRow: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      gap: spacing.sm,
+      paddingHorizontal: spacing.sm,
+    },
+    title: {
+      ...typography.h3,
+      color: c.text,
+      flexShrink: 1,
+    },
+    subtitle: {
+      fontSize: typography.caption.fontSize,
+      color: c.textMuted,
+      paddingHorizontal: spacing.sm,
+      marginTop: 2,
+    },
+    scroll: {
+      marginTop: spacing.sm,
+    },
+    section: {
+      marginTop: spacing.md,
+    },
+    sectionLabel: {
+      fontSize: typography.caption.fontSize,
+      fontWeight: '600' as const,
+      color: c.textMuted,
+      textTransform: 'uppercase' as const,
+      paddingHorizontal: spacing.sm,
+      marginBottom: spacing.xs,
+    },
+    shareRow: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      gap: spacing.sm,
+      paddingHorizontal: spacing.sm,
+      paddingVertical: spacing.sm,
+      borderBottomWidth: 1,
+      borderBottomColor: c.border,
+    },
+    principalInfo: {
+      flex: 1,
+      minWidth: 0,
+    },
+    principalName: {
+      fontSize: typography.body.fontSize,
+      color: c.text,
+    },
+    principalEmail: {
+      fontSize: typography.caption.fontSize,
+      color: c.textMuted,
+    },
+    roleChips: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      gap: spacing.xs,
+    },
+    chip: {
+      paddingHorizontal: spacing.sm,
+      paddingVertical: 4,
+      borderRadius: radius.sm,
+      borderWidth: 1,
+      borderColor: c.border,
+    },
+    chipActive: {
+      backgroundColor: c.primaryBg,
+      borderColor: c.primary,
+    },
+    chipText: {
+      fontSize: typography.caption.fontSize,
+      color: c.textMuted,
+    },
+    chipTextActive: {
+      color: c.primary,
+      fontWeight: '600' as const,
+    },
+    customLabel: {
+      fontSize: typography.caption.fontSize,
+      color: c.textMuted,
+      fontStyle: 'italic' as const,
+    },
+    emptyRow: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      gap: spacing.sm,
+      paddingHorizontal: spacing.sm,
+      paddingVertical: spacing.md,
+    },
+    emptyText: {
+      fontSize: typography.body.fontSize,
+      color: c.textMuted,
+    },
+    input: {
+      borderWidth: 1,
+      borderColor: c.border,
+      borderRadius: radius.md,
+      paddingHorizontal: spacing.md,
+      paddingVertical: spacing.sm,
+      color: c.text,
+      fontSize: typography.body.fontSize,
+      backgroundColor: c.surface,
+      marginHorizontal: spacing.sm,
+    },
+    noMatches: {
+      fontSize: typography.caption.fontSize,
+      color: c.textMuted,
+      paddingHorizontal: spacing.sm,
+      paddingVertical: spacing.sm,
+    },
+    candidateRow: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      gap: spacing.sm,
+      paddingHorizontal: spacing.sm,
+      paddingVertical: spacing.sm,
+      borderRadius: radius.md,
+    },
+    doneBtn: {
+      marginTop: spacing.md,
+      alignSelf: 'stretch',
+      alignItems: 'center',
+      paddingVertical: spacing.sm,
+      borderRadius: radius.md,
+      backgroundColor: c.primary,
+    },
+    doneText: {
+      color: c.primaryForeground,
+      fontWeight: '600' as const,
+      fontSize: typography.body.fontSize,
+    },
+  });
+}

src/components/filters/FilterRuleModal.tsx

@@ -0,0 +1,467 @@
+import React, { useCallback, useMemo, useState } from 'react';
+import {
+  View, Text, StyleSheet, ScrollView, Pressable, Modal, Alert,
+  KeyboardAvoidingView, Platform,
+} from 'react-native';
+import { SafeAreaView } from 'react-native-safe-area-context';
+import { X, Plus, Trash2 } from 'lucide-react-native';
+import { spacing, radius, typography, componentSizes, type ThemePalette } from '../../theme/tokens';
+import { useColors } from '../../theme/colors';
+import { Select, ToggleSwitch } from '../settings/settings-section';
+import Input from '../Input';
+import Button from '../Button';
+import { useLocaleStore } from '../../stores/locale-store';
+import { useKeywordsStore } from '../../stores/keywords-store';
+import { buildMailboxTree, type MailboxNode } from '../../lib/mailbox-tree';
+import { generateUUID } from '../../lib/uuid';
+import type { Mailbox } from '../../api/types';
+import type {
+  FilterRule,
+  FilterCondition,
+  FilterAction,
+  FilterConditionField,
+  FilterComparator,
+  FilterActionType,
+} from '../../lib/sieve/types';
+
+const ALL_FIELDS: FilterConditionField[] = ['from', 'to', 'cc', 'subject', 'header', 'size', 'body'];
+const TEXT_COMPARATORS: FilterComparator[] = ['contains', 'not_contains', 'is', 'not_is', 'starts_with', 'ends_with', 'matches'];
+const SIZE_COMPARATORS: FilterComparator[] = ['greater_than', 'less_than'];
+const ALL_ACTION_TYPES: FilterActionType[] = ['move', 'copy', 'forward', 'mark_read', 'star', 'add_label', 'discard', 'reject', 'keep', 'stop'];
+
+const ACTIONS_WITH_VALUE = new Set<FilterActionType>(['move', 'copy', 'forward', 'reject', 'add_label']);
+const ACTIONS_WITH_MAILBOX = new Set<FilterActionType>(['move', 'copy']);
+
+function makeEmptyCondition(): FilterCondition {
+  return { field: 'from', comparator: 'contains', value: '' };
+}
+function makeEmptyAction(): FilterAction {
+  return { type: 'move', value: '' };
+}
+
+interface FilterRuleModalProps {
+  visible: boolean;
+  rule?: FilterRule;
+  mailboxes: Mailbox[];
+  onSave: (rule: FilterRule) => void;
+  onClose: () => void;
+}
+
+// Flatten the mailbox tree into pickable options, building the Sieve-canonical
+// folder path for each (inbox -> "INBOX", not the localized display name).
+function buildMailboxOptions(mailboxes: Mailbox[]): { value: string; label: string }[] {
+  const tree = buildMailboxTree(mailboxes);
+  const options: { value: string; label: string }[] = [];
+  const walk = (nodes: MailboxNode[], parentPath: string) => {
+    for (const node of nodes) {
+      const segment = node.role === 'inbox' ? 'INBOX' : node.name;
+      const fullPath = parentPath ? `${parentPath}/${segment}` : segment;
+      options.push({ value: fullPath, label: `${' '.repeat(node.depth * 3)}${node.name}` });
+      if (node.children.length > 0) walk(node.children, fullPath);
+    }
+  };
+  walk(tree, '');
+  return options;
+}
+
+export function FilterRuleModal({ visible, rule, mailboxes, onSave, onClose }: FilterRuleModalProps) {
+  const c = useColors();
+  const styles = useMemo(() => makeStyles(c), [c]);
+  const t = useLocaleStore((s) => s.t);
+  const keywords = useKeywordsStore((s) => s.keywords);
+  const isEdit = !!rule;
+
+  const [name, setName] = useState(rule?.name || '');
+  const [matchType, setMatchType] = useState<'all' | 'any'>(rule?.matchType || 'all');
+  const [conditions, setConditions] = useState<FilterCondition[]>(
+    rule?.conditions.length ? [...rule.conditions] : [makeEmptyCondition()],
+  );
+  const [actions, setActions] = useState<FilterAction[]>(
+    rule?.actions.length ? [...rule.actions] : [makeEmptyAction()],
+  );
+  const [stopProcessing, setStopProcessing] = useState(rule?.stopProcessing ?? false);
+
+  const mailboxOptions = useMemo(() => buildMailboxOptions(mailboxes), [mailboxes]);
+
+  const fieldOptions = useMemo(
+    () => ALL_FIELDS.map((f) => ({ value: f, label: t(`settings.filters.condition_fields.${f}`, f) })),
+    [t],
+  );
+  const actionTypeOptions = useMemo(
+    () => ALL_ACTION_TYPES.map((a) => ({ value: a, label: t(`settings.filters.action_types.${a}`, a) })),
+    [t],
+  );
+  const keywordOptions = useMemo(
+    () => keywords.map((kw) => ({ value: kw.id, label: kw.label })),
+    [keywords],
+  );
+
+  const comparatorOptions = useCallback(
+    (field: FilterConditionField) =>
+      (field === 'size' ? SIZE_COMPARATORS : TEXT_COMPARATORS).map((cmp) => ({
+        value: cmp,
+        label: t(`settings.filters.comparators.${cmp}`, cmp),
+      })),
+    [t],
+  );
+
+  const updateCondition = (index: number, updates: Partial<FilterCondition>) => {
+    setConditions((prev) =>
+      prev.map((cond, i) => {
+        if (i !== index) return cond;
+        const updated = { ...cond, ...updates };
+        if (updates.field === 'size' && !SIZE_COMPARATORS.includes(cond.comparator)) {
+          updated.comparator = 'greater_than';
+        }
+        if (updates.field && updates.field !== 'size' && SIZE_COMPARATORS.includes(cond.comparator)) {
+          updated.comparator = 'contains';
+        }
+        if (updates.field && updates.field !== 'header') {
+          delete updated.headerName;
+        }
+        return updated;
+      }),
+    );
+  };
+
+  const removeCondition = (index: number) => {
+    if (conditions.length <= 1) return;
+    setConditions((prev) => prev.filter((_, i) => i !== index));
+  };
+
+  const updateAction = (index: number, updates: Partial<FilterAction>) => {
+    setActions((prev) =>
+      prev.map((act, i) => {
+        if (i !== index) return act;
+        const updated = { ...act, ...updates };
+        if (updates.type && !ACTIONS_WITH_VALUE.has(updates.type)) {
+          delete updated.value;
+        }
+        if (updates.type && ACTIONS_WITH_MAILBOX.has(updates.type) && !updated.value) {
+          updated.value = mailboxOptions[0]?.value ?? '';
+        }
+        return updated;
+      }),
+    );
+  };
+
+  const removeAction = (index: number) => {
+    if (actions.length <= 1) return;
+    setActions((prev) => prev.filter((_, i) => i !== index));
+  };
+
+  const handleSave = useCallback(() => {
+    const trimmedName = name.trim();
+    if (!trimmedName) {
+      Alert.alert(t('settings.filters.validation_empty_name', 'Rule name is required'));
+      return;
+    }
+    const validConditions = conditions.filter((cond) => cond.value.trim());
+    if (validConditions.length === 0) {
+      Alert.alert(t('settings.filters.validation_empty_conditions', 'At least one condition with a value is required'));
+      return;
+    }
+    const validActions = actions.filter((a) => !ACTIONS_WITH_VALUE.has(a.type) || a.value?.trim());
+    if (validActions.length === 0) {
+      Alert.alert(t('settings.filters.validation_empty_actions', 'At least one action is required'));
+      return;
+    }
+    onSave({
+      id: rule?.id || generateUUID(),
+      name: trimmedName,
+      enabled: rule?.enabled ?? true,
+      matchType,
+      conditions: validConditions,
+      actions: validActions,
+      stopProcessing,
+    });
+  }, [name, conditions, actions, matchType, stopProcessing, rule, onSave, t]);
+
+  return (
+    <Modal visible={visible} animationType="slide" onRequestClose={onClose} statusBarTranslucent>
+      <SafeAreaView style={styles.container} edges={['top', 'bottom']}>
+        <View style={styles.header}>
+          <Pressable onPress={onClose} hitSlop={8} style={styles.headerClose}>
+            <X size={20} color={c.text} />
+          </Pressable>
+          <Text style={styles.headerTitle}>
+            {isEdit ? t('settings.filters.edit_rule', 'Edit Rule') : t('settings.filters.new_rule', 'New Rule')}
+          </Text>
+          <View style={styles.headerRightSpacer} />
+        </View>
+
+        <KeyboardAvoidingView
+          style={{ flex: 1 }}
+          behavior={Platform.OS === 'ios' ? 'padding' : undefined}
+        >
+          <ScrollView contentContainerStyle={styles.body} keyboardShouldPersistTaps="handled">
+            {/* Name */}
+            <View>
+              <Text style={styles.label}>{t('settings.filters.rule_name', 'Rule Name')}</Text>
+              <Input
+                value={name}
+                onChangeText={setName}
+                placeholder={t('settings.filters.rule_name_placeholder', 'e.g., Sort newsletters')}
+                maxLength={200}
+              />
+            </View>
+
+            {/* Match type */}
+            <View>
+              <Text style={styles.label}>{t('settings.filters.match_type', 'Match type')}</Text>
+              <View style={styles.matchRow}>
+                {(['all', 'any'] as const).map((mt) => {
+                  const selected = matchType === mt;
+                  return (
+                    <Pressable
+                      key={mt}
+                      onPress={() => setMatchType(mt)}
+                      style={[styles.matchBtn, selected ? styles.matchBtnOn : styles.matchBtnOff]}
+                    >
+                      <Text style={selected ? styles.matchTextOn : styles.matchTextOff}>
+                        {mt === 'all'
+                          ? t('settings.filters.match_all', 'Match ALL conditions')
+                          : t('settings.filters.match_any', 'Match ANY condition')}
+                      </Text>
+                    </Pressable>
+                  );
+                })}
+              </View>
+            </View>
+
+            {/* Conditions */}
+            <View>
+              <Text style={styles.label}>{t('settings.filters.conditions', 'Conditions')}</Text>
+              <View style={{ gap: spacing.sm }}>
+                {conditions.map((condition, index) => (
+                  <View key={index} style={styles.card}>
+                    <View style={styles.cardTopRow}>
+                      <Select
+                        value={condition.field}
+                        onChange={(v) => updateCondition(index, { field: v as FilterConditionField })}
+                        options={fieldOptions}
+                        style={{ flex: 1 }}
+                      />
+                      <Pressable
+                        onPress={() => removeCondition(index)}
+                        disabled={conditions.length <= 1}
+                        hitSlop={8}
+                        style={[styles.removeBtn, conditions.length <= 1 && styles.removeBtnDisabled]}
+                      >
+                        <Trash2 size={16} color={c.mutedForeground} />
+                      </Pressable>
+                    </View>
+
+                    {condition.field === 'header' && (
+                      <Input
+                        value={condition.headerName || ''}
+                        onChangeText={(v) => updateCondition(index, { headerName: v })}
+                        placeholder={t('settings.filters.header_name', 'Header name')}
+                      />
+                    )}
+
+                    <Select
+                      value={condition.comparator}
+                      onChange={(v) => updateCondition(index, { comparator: v as FilterComparator })}
+                      options={comparatorOptions(condition.field)}
+                      style={{ alignSelf: 'flex-start' }}
+                    />
+
+                    <Input
+                      value={condition.value}
+                      onChangeText={(v) => updateCondition(index, { value: v })}
+                      placeholder={
+                        condition.field === 'size'
+                          ? t('settings.filters.size_placeholder', 'e.g., 1000000')
+                          : t('settings.filters.header_placeholder', 'Value')
+                      }
+                      keyboardType={condition.field === 'size' ? 'numeric' : 'default'}
+                    />
+                  </View>
+                ))}
+              </View>
+              <Pressable
+                onPress={() => setConditions((prev) => [...prev, makeEmptyCondition()])}
+                style={styles.addRow}
+              >
+                <Plus size={14} color={c.primary} />
+                <Text style={styles.addText}>{t('settings.filters.add_condition', 'Add Condition')}</Text>
+              </Pressable>
+            </View>
+
+            {/* Actions */}
+            <View>
+              <Text style={styles.label}>{t('settings.filters.actions', 'Actions')}</Text>
+              <View style={{ gap: spacing.sm }}>
+                {actions.map((action, index) => (
+                  <View key={index} style={styles.card}>
+                    <View style={styles.cardTopRow}>
+                      <Select
+                        value={action.type}
+                        onChange={(v) => updateAction(index, { type: v as FilterActionType })}
+                        options={actionTypeOptions}
+                        style={{ flex: 1 }}
+                      />
+                      <Pressable
+                        onPress={() => removeAction(index)}
+                        disabled={actions.length <= 1}
+                        hitSlop={8}
+                        style={[styles.removeBtn, actions.length <= 1 && styles.removeBtnDisabled]}
+                      >
+                        <Trash2 size={16} color={c.mutedForeground} />
+                      </Pressable>
+                    </View>
+
+                    {ACTIONS_WITH_MAILBOX.has(action.type) && (
+                      mailboxOptions.length > 0 ? (
+                        <Select
+                          value={action.value || ''}
+                          onChange={(v) => updateAction(index, { value: v })}
+                          options={mailboxOptions}
+                          style={{ alignSelf: 'stretch' }}
+                        />
+                      ) : (
+                        <Input
+                          value={action.value || ''}
+                          onChangeText={(v) => updateAction(index, { value: v })}
+                          placeholder={t('settings.filters.move_to_folder', 'Select folder')}
+                        />
+                      )
+                    )}
+
+                    {action.type === 'forward' && (
+                      <Input
+                        value={action.value || ''}
+                        onChangeText={(v) => updateAction(index, { value: v })}
+                        placeholder={t('settings.filters.forward_placeholder', 'email@example.com')}
+                        keyboardType="email-address"
+                        autoCapitalize="none"
+                      />
+                    )}
+
+                    {action.type === 'reject' && (
+                      <Input
+                        value={action.value || ''}
+                        onChangeText={(v) => updateAction(index, { value: v })}
+                        placeholder={t('settings.filters.reject_placeholder', 'Your email has been rejected')}
+                      />
+                    )}
+
+                    {action.type === 'add_label' && (
+                      keywordOptions.length > 0 ? (
+                        <Select
+                          value={action.value || ''}
+                          onChange={(v) => updateAction(index, { value: v })}
+                          options={keywordOptions}
+                          style={{ alignSelf: 'stretch' }}
+                        />
+                      ) : (
+                        <Input
+                          value={action.value || ''}
+                          onChangeText={(v) => updateAction(index, { value: v })}
+                          placeholder={t('settings.filters.label_placeholder', 'Select tag')}
+                        />
+                      )
+                    )}
+                  </View>
+                ))}
+              </View>
+              <Pressable
+                onPress={() => setActions((prev) => [...prev, makeEmptyAction()])}
+                style={styles.addRow}
+              >
+                <Plus size={14} color={c.primary} />
+                <Text style={styles.addText}>{t('settings.filters.add_action', 'Add Action')}</Text>
+              </Pressable>
+            </View>
+
+            {/* Stop processing */}
+            <View style={styles.stopRow}>
+              <Text style={styles.stopLabel}>
+                {t('settings.filters.stop_processing', 'Stop processing subsequent rules')}
+              </Text>
+              <ToggleSwitch checked={stopProcessing} onChange={setStopProcessing} />
+            </View>
+          </ScrollView>
+        </KeyboardAvoidingView>
+
+        <View style={styles.footer}>
+          <Button variant="outline" onPress={onClose}>
+            {t('settings.filters.cancel', 'Cancel')}
+          </Button>
+          <Button onPress={handleSave} disabled={!name.trim()}>
+            {t('settings.filters.save', 'Save')}
+          </Button>
+        </View>
+      </SafeAreaView>
+    </Modal>
+  );
+}
+
+function makeStyles(c: ThemePalette) {
+  return StyleSheet.create({
+    container: { flex: 1, backgroundColor: c.background },
+    header: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      height: componentSizes.headerHeight,
+      paddingHorizontal: spacing.lg,
+      borderBottomWidth: 1,
+      borderBottomColor: c.border,
+      gap: spacing.sm,
+    },
+    headerClose: {
+      width: 40, height: 40,
+      alignItems: 'center', justifyContent: 'center',
+      borderRadius: radius.md,
+    },
+    headerTitle: { ...typography.h3, color: c.text, flex: 1, textAlign: 'center' },
+    headerRightSpacer: { width: 40 },
+
+    body: { padding: spacing.lg, gap: spacing.xl, paddingBottom: spacing.xxxl },
+    label: { ...typography.bodyMedium, color: c.text, marginBottom: spacing.sm },
+
+    matchRow: { flexDirection: 'row', gap: spacing.sm },
+    matchBtn: { paddingHorizontal: spacing.md, paddingVertical: 8, borderRadius: radius.sm },
+    matchBtnOn: { backgroundColor: c.primary },
+    matchBtnOff: { backgroundColor: c.muted },
+    matchTextOn: { ...typography.caption, color: c.primaryForeground, fontWeight: '500' },
+    matchTextOff: { ...typography.caption, color: c.text },
+
+    card: {
+      gap: spacing.sm,
+      padding: spacing.md,
+      borderRadius: radius.md,
+      borderWidth: 1,
+      borderColor: c.border,
+    },
+    cardTopRow: { flexDirection: 'row', alignItems: 'center', gap: spacing.sm },
+    removeBtn: {
+      width: 36, height: 36,
+      alignItems: 'center', justifyContent: 'center',
+      borderRadius: radius.sm,
+    },
+    removeBtnDisabled: { opacity: 0.3 },
+
+    addRow: { flexDirection: 'row', alignItems: 'center', gap: 4, marginTop: spacing.sm },
+    addText: { ...typography.body, color: c.primary, fontWeight: '500' },
+
+    stopRow: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      justifyContent: 'space-between',
+      gap: spacing.md,
+    },
+    stopLabel: { ...typography.body, color: c.text, flex: 1 },
+
+    footer: {
+      flexDirection: 'row',
+      justifyContent: 'flex-end',
+      gap: spacing.sm,
+      paddingHorizontal: spacing.lg,
+      paddingVertical: spacing.md,
+      borderTopWidth: 1,
+      borderTopColor: c.border,
+    },
+  });
+}

src/components/filters/SieveEditorSheet.tsx

@@ -0,0 +1,255 @@
+import React, { useCallback, useMemo, useState } from 'react';
+import {
+  View, Text, StyleSheet, ScrollView, Pressable, Modal, TextInput,
+  KeyboardAvoidingView, Platform, ActivityIndicator,
+} from 'react-native';
+import { SafeAreaView } from 'react-native-safe-area-context';
+import { X, AlertTriangle, CheckCircle } from 'lucide-react-native';
+import { spacing, radius, typography, componentSizes, type ThemePalette } from '../../theme/tokens';
+import { useColors } from '../../theme/colors';
+import Button from '../Button';
+import { useLocaleStore } from '../../stores/locale-store';
+
+interface SieveEditorSheetProps {
+  visible: boolean;
+  content: string;
+  onSave: (content: string) => void;
+  onClose: () => void;
+  onValidate: (content: string) => Promise<{ isValid: boolean; errors?: string[] }>;
+}
+
+export function SieveEditorSheet({ visible, content, onSave, onClose, onValidate }: SieveEditorSheetProps) {
+  const c = useColors();
+  const styles = useMemo(() => makeStyles(c), [c]);
+  const t = useLocaleStore((s) => s.t);
+
+  const [script, setScript] = useState(content);
+  const [isValidating, setIsValidating] = useState(false);
+  const [validationResult, setValidationResult] = useState<{ isValid: boolean; errors?: string[] } | null>(null);
+  const [showSaveWarning, setShowSaveWarning] = useState(false);
+
+  // Re-seed the editor whenever it's (re)opened with fresh content. Keying the
+  // editor on `content` while closed avoids a stale draft on the next open.
+  React.useEffect(() => {
+    if (visible) {
+      setScript(content);
+      setValidationResult(null);
+      setShowSaveWarning(false);
+    }
+  }, [visible, content]);
+
+  const lineCount = script.split('\n').length;
+
+  const handleValidate = useCallback(async () => {
+    setIsValidating(true);
+    setValidationResult(null);
+    try {
+      const result = await onValidate(script);
+      setValidationResult(result);
+    } catch {
+      setValidationResult({ isValid: false, errors: [t('settings.filters.sieve_editor.validation_failed', 'Validation request failed')] });
+    } finally {
+      setIsValidating(false);
+    }
+  }, [script, onValidate, t]);
+
+  const handleSave = useCallback(() => {
+    if (!showSaveWarning) {
+      setShowSaveWarning(true);
+      return;
+    }
+    onSave(script);
+  }, [script, showSaveWarning, onSave]);
+
+  return (
+    <Modal visible={visible} animationType="slide" onRequestClose={onClose} statusBarTranslucent>
+      <SafeAreaView style={styles.container} edges={['top', 'bottom']}>
+        <View style={styles.header}>
+          <Pressable onPress={onClose} hitSlop={8} style={styles.headerClose}>
+            <X size={20} color={c.text} />
+          </Pressable>
+          <Text style={styles.headerTitle}>{t('settings.filters.sieve_editor.title', 'Sieve Script Editor')}</Text>
+          <View style={styles.headerRightSpacer} />
+        </View>
+
+        <KeyboardAvoidingView
+          style={{ flex: 1 }}
+          behavior={Platform.OS === 'ios' ? 'padding' : undefined}
+        >
+          <View style={styles.body}>
+            <View style={styles.warningBanner}>
+              <AlertTriangle size={16} color={c.warning} />
+              <Text style={styles.warningText}>
+                {t('settings.filters.sieve_editor.warning', 'Editing the raw Sieve script may break visual rule editing. Changes made here override the visual builder.')}
+              </Text>
+            </View>
+
+            <ScrollView style={styles.editorWrap} contentContainerStyle={styles.editorContent}>
+              <TextInput
+                value={script}
+                onChangeText={(v) => {
+                  setScript(v);
+                  setValidationResult(null);
+                  setShowSaveWarning(false);
+                }}
+                style={styles.editor}
+                multiline
+                autoCapitalize="none"
+                autoCorrect={false}
+                spellCheck={false}
+                textAlignVertical="top"
+                placeholder={t('settings.filters.sieve_editor.script_content', 'Sieve script')}
+                placeholderTextColor={c.textMuted}
+                accessibilityLabel={t('settings.filters.sieve_editor.script_content', 'Sieve script')}
+              />
+            </ScrollView>
+
+            <Text style={styles.lineCount}>{lineCount} {lineCount === 1 ? 'line' : 'lines'}</Text>
+
+            {validationResult && (
+              <View style={[styles.resultBanner, validationResult.isValid ? styles.resultOk : styles.resultErr]}>
+                {validationResult.isValid ? (
+                  <>
+                    <CheckCircle size={16} color={c.success} />
+                    <Text style={[styles.resultText, { color: c.success }]}>
+                      {t('settings.filters.sieve_editor.valid', 'Script is valid')}
+                    </Text>
+                  </>
+                ) : (
+                  <>
+                    <AlertTriangle size={16} color={c.error} />
+                    <View style={{ flex: 1 }}>
+                      <Text style={[styles.resultText, { color: c.error, fontWeight: '600' }]}>
+                        {t('settings.filters.sieve_editor.invalid', 'Script has errors')}
+                      </Text>
+                      {validationResult.errors?.map((err, i) => (
+                        <Text key={i} style={styles.errorDetail}>{err}</Text>
+                      ))}
+                    </View>
+                  </>
+                )}
+              </View>
+            )}
+
+            {showSaveWarning && (
+              <View style={styles.warningBanner}>
+                <AlertTriangle size={16} color={c.warning} />
+                <Text style={styles.warningText}>
+                  {t('settings.filters.sieve_editor.save_warning', 'Saving will overwrite any visual rules. This cannot be undone. Tap Save again to confirm.')}
+                </Text>
+              </View>
+            )}
+          </View>
+        </KeyboardAvoidingView>
+
+        <View style={styles.footer}>
+          <Button
+            variant="outline"
+            onPress={handleValidate}
+            disabled={isValidating || !script.trim()}
+            icon={isValidating ? <ActivityIndicator size="small" color={c.text} /> : undefined}
+          >
+            {isValidating
+              ? t('settings.filters.sieve_editor.validating', 'Validating...')
+              : t('settings.filters.sieve_editor.validate', 'Validate')}
+          </Button>
+          <View style={styles.footerRight}>
+            <Button variant="outline" onPress={onClose}>
+              {t('settings.filters.sieve_editor.cancel', 'Cancel')}
+            </Button>
+            <Button onPress={handleSave} disabled={!script.trim()}>
+              {showSaveWarning
+                ? t('settings.filters.sieve_editor.confirm_save', 'Confirm Save')
+                : t('settings.filters.sieve_editor.save', 'Save')}
+            </Button>
+          </View>
+        </View>
+      </SafeAreaView>
+    </Modal>
+  );
+}
+
+function makeStyles(c: ThemePalette) {
+  return StyleSheet.create({
+    container: { flex: 1, backgroundColor: c.background },
+    header: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      height: componentSizes.headerHeight,
+      paddingHorizontal: spacing.lg,
+      borderBottomWidth: 1,
+      borderBottomColor: c.border,
+      gap: spacing.sm,
+    },
+    headerClose: {
+      width: 40, height: 40,
+      alignItems: 'center', justifyContent: 'center',
+      borderRadius: radius.md,
+    },
+    headerTitle: { ...typography.h3, color: c.text, flex: 1, textAlign: 'center' },
+    headerRightSpacer: { width: 40 },
+
+    body: { flex: 1, padding: spacing.lg, gap: spacing.md },
+
+    warningBanner: {
+      flexDirection: 'row',
+      gap: spacing.sm,
+      padding: spacing.md,
+      borderRadius: radius.sm,
+      borderWidth: 1,
+      borderColor: 'rgba(252, 211, 77, 0.4)',
+      backgroundColor: 'rgba(120, 53, 15, 0.25)',
+      alignItems: 'flex-start',
+    },
+    warningText: { ...typography.caption, color: '#fde68a', flex: 1 },
+
+    editorWrap: {
+      flex: 1,
+      borderWidth: 1,
+      borderColor: c.border,
+      borderRadius: radius.md,
+      backgroundColor: c.surface,
+    },
+    editorContent: { flexGrow: 1 },
+    editor: {
+      flex: 1,
+      minHeight: 240,
+      padding: spacing.md,
+      color: c.text,
+      fontFamily: Platform.select({ ios: 'Menlo', android: 'monospace', default: 'monospace' }),
+      fontSize: 13,
+      lineHeight: 20,
+    },
+    lineCount: { ...typography.caption, color: c.mutedForeground, textAlign: 'right' },
+
+    resultBanner: {
+      flexDirection: 'row',
+      gap: spacing.sm,
+      padding: spacing.md,
+      borderRadius: radius.sm,
+      borderWidth: 1,
+      alignItems: 'flex-start',
+    },
+    resultOk: { backgroundColor: c.successBg, borderColor: c.success },
+    resultErr: { backgroundColor: c.errorBg, borderColor: c.errorBorder },
+    resultText: { ...typography.caption },
+    errorDetail: {
+      ...typography.caption,
+      color: c.error,
+      fontFamily: Platform.select({ ios: 'Menlo', android: 'monospace', default: 'monospace' }),
+      marginTop: 4,
+    },
+
+    footer: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      justifyContent: 'space-between',
+      gap: spacing.sm,
+      paddingHorizontal: spacing.lg,
+      paddingVertical: spacing.md,
+      borderTopWidth: 1,
+      borderTopColor: c.border,
+    },
+    footerRight: { flexDirection: 'row', gap: spacing.sm },
+  });
+}

src/components/settings/AboutDataSettings.tsx

@@ -8,6 +8,7 @@ import { spacing, radius, typography, type ThemePalette } from '../../theme/toke
 import { useColors } from '../../theme/colors';
 import { useSettingsStore } from '../../stores/settings-store';
 import { useOfflineCacheStore } from '../../stores/offline-cache-store';
+import { useOutboxStore } from '../../stores/outbox-store';
 import { runOfflineSync, formatBytes } from '../../lib/offline-sync';
 
 const APP_VERSION = Constants.expoConfig?.version ?? '0.0.0';
@@ -22,6 +23,14 @@ const DAY_OPTIONS = [
   { value: '90', label: 'Last 90 days' },
 ];
 
+const MAX_MB_OPTIONS = [
+  { value: '25',  label: '25 MB' },
+  { value: '50',  label: '50 MB' },
+  { value: '100', label: '100 MB' },
+  { value: '250', label: '250 MB' },
+  { value: '500', label: '500 MB' },
+];
+
 function formatRelativeTime(ms: number | undefined): string {
   if (!ms) return 'never';
   const diff = Date.now() - ms;
@@ -58,7 +67,10 @@ export function AboutDataSettings() {
 
   const offlineEnabled = useSettingsStore((s) => s.offlineCacheEnabled);
   const offlineDays = useSettingsStore((s) => s.offlineCacheDays);
+  const offlineMaxMB = useSettingsStore((s) => s.offlineCacheMaxMB);
   const updateSetting = useSettingsStore((s) => s.updateSetting);
+  const queuedChanges = useOutboxStore((s) => s.entries.length);
+  const flushOutbox = useOutboxStore((s) => s.flush);
   const cacheCount = useOfflineCacheStore((s) => s.totalCount());
   const cacheBytes = useOfflineCacheStore((s) => s.totalSize());
   const cacheHydrated = useOfflineCacheStore((s) => s.hydrated);
@@ -73,7 +85,9 @@ export function AboutDataSettings() {
   }, [hydrated, hydrate, cacheHydrated, cacheHydrate]);
 
   const handleSyncNow = () => {
-    void runOfflineSync({ days: offlineDays });
+    void runOfflineSync({ days: offlineDays, maxMB: offlineMaxMB });
+    // Also drain any queued offline changes while we're at it.
+    void flushOutbox();
   };
 
   const handleClearCache = () => {
@@ -142,6 +156,16 @@ export function AboutDataSettings() {
             options={DAY_OPTIONS}
           />
         </SettingItem>
+        <SettingItem
+          label="Maximum size"
+          description="Oldest messages are removed when the cache grows past this."
+        >
+          <Select
+            value={String(offlineMaxMB)}
+            onChange={(v) => updateSetting('offlineCacheMaxMB', Number(v))}
+            options={MAX_MB_OPTIONS}
+          />
+        </SettingItem>
 
         <View style={styles.cacheStatsBox}>
           <View style={styles.cacheStatsHeader}>
@@ -161,6 +185,11 @@ export function AboutDataSettings() {
                   ? `Last sync failed: ${sync.message ?? 'unknown error'}`
                   : `Last sync ${formatRelativeTime(sync.finishedAt)}`}
           </Text>
+          {queuedChanges > 0 && (
+            <Text style={styles.cacheStatsSub}>
+              {`${queuedChanges} change${queuedChanges === 1 ? '' : 's'} waiting to sync`}
+            </Text>
+          )}
           {syncBusy && sync.total > 0 && (
             <View style={styles.progressTrack}>
               <View

src/components/settings/AccountSecuritySettings.tsx

@@ -1,6 +1,10 @@
-import React, { useEffect, useState } from 'react';
-import { Alert, View, Text, StyleSheet, Pressable } from 'react-native';
-import { Key, Smartphone, Lock, Eye, EyeOff, ShieldCheck, Monitor, Trash2 } from 'lucide-react-native';
+import React, { useCallback, useEffect, useState } from 'react';
+import { Alert, View, Text, StyleSheet, Pressable, Linking, ActivityIndicator } from 'react-native';
+import DateTimePicker, { type DateTimePickerEvent } from '@react-native-community/datetimepicker';
+import {
+  Key, Smartphone, Lock, Eye, EyeOff, ShieldCheck, Monitor, Trash2,
+  Plus, Shield, Terminal, Check, ExternalLink, Calendar, X,
+} from 'lucide-react-native';
 import { SettingsSection, SettingItem, ToggleSwitch } from './settings-section';
 import Input from '../Input';
 import Button from '../Button';
@@ -13,45 +17,44 @@ import {
   isClientCertSupported,
   pickClientCertAlias,
 } from '../../lib/client-cert';
+import {
+  isStalwartSupported,
+  fetchAuthInfo,
+  fetchEncryptionType,
+  fetchPrincipal,
+  changePassword,
+  updateDisplayName,
+  enableTotp,
+  disableTotp,
+  createAppPassword,
+  removeAppPassword,
+  createApiKey,
+  removeApiKey,
+  type AppCredentialInfo,
+  type AppCredentialInput,
+  type AuthInfo,
+  type EncryptionType,
+} from '../../api/account-security';
+import { generateTotpEnrolment, type TotpEnrolment } from '../../lib/totp';
 
-interface Session {
-  id: string;
-  device: string;
-  location: string;
-  current: boolean;
-}
-
-const MOCK_SESSIONS: Session[] = [
-  { id: '1', device: 'iPhone 15 Pro - Bulwark Mobile', location: 'Berlin, DE', current: true },
-  { id: '2', device: 'Chrome on macOS', location: 'Berlin, DE', current: false },
-];
-
-export function AccountSecuritySettings() {
+// ── TLS client certificate (mobile-only) ──────────────────
+// Picks an installed Android cert for mTLS handshakes. Independent of the
+// Stalwart account features below, so it stays visible even on non-Stalwart
+// servers.
+function ClientCertSection() {
   const c = useColors();
   const styles = React.useMemo(() => makeStyles(c), [c]);
-  const [currentPwd, setCurrentPwd] = useState('');
-  const [newPwd, setNewPwd] = useState('');
-  const [confirmPwd, setConfirmPwd] = useState('');
-  const [showCurrent, setShowCurrent] = useState(false);
-  const [showNew, setShowNew] = useState(false);
-  const [twoFactor, setTwoFactor] = useState(false);
-  const [appPwds] = useState<{ id: string; label: string; created: string }[]>([]);
-
-  const certSupported = isClientCertSupported();
   const [certAlias, setCertAlias] = useState<string | null>(null);
   const [certBusy, setCertBusy] = useState(false);
 
   useEffect(() => {
-    if (!certSupported) return;
     void getClientCertAlias().then(setCertAlias);
-  }, [certSupported]);
+  }, []);
 
   const onPickCert = async () => {
     if (certBusy) return;
     setCertBusy(true);
     try {
-      // Hint the picker with the JMAP server host so it can pre-filter to certs
-      // issued for it when the OEM picker honours that.
       const host = jmapClient.serverUrl ? new URL(jmapClient.serverUrl).hostname : null;
       const alias = await pickClientCertAlias(host);
       setCertAlias(alias);
@@ -62,7 +65,7 @@ export function AccountSecuritySettings() {
     }
   };
 
-  const onClearCert = async () => {
+  const onClearCert = () => {
     if (certBusy) return;
     Alert.alert(
       'Stop using client certificate?',
@@ -87,218 +90,644 @@ export function AccountSecuritySettings() {
   };
 
   return (
-    <View style={styles.container}>
-      {certSupported && (
-        <SettingsSection
-          title="TLS client certificate"
-          description="Picks an installed Android certificate to authenticate to the server during the TLS handshake. Useful when the reverse proxy enforces mTLS."
-        >
-          <View style={styles.certRow}>
-            <ShieldCheck size={18} color={certAlias ? c.success : c.mutedForeground} />
-            <View style={{ flex: 1 }}>
-              <Text style={styles.certStatus}>
-                {certAlias ? `Active: ${certAlias}` : 'Not set'}
-              </Text>
-              <Text style={styles.certHint}>
-                Install the certificate via Android Settings → Security → Encryption &amp; credentials, then pick it here.
-              </Text>
-            </View>
+    <SettingsSection
+      title="TLS client certificate"
+      description="Picks an installed Android certificate to authenticate to the server during the TLS handshake. Useful when the reverse proxy enforces mTLS."
+    >
+      <View style={styles.certRow}>
+        <ShieldCheck size={18} color={certAlias ? c.success : c.mutedForeground} />
+        <View style={{ flex: 1 }}>
+          <Text style={styles.certStatus}>{certAlias ? `Active: ${certAlias}` : 'Not set'}</Text>
+          <Text style={styles.certHint}>
+            Install the certificate via Android Settings → Security → Encryption &amp; credentials, then pick it here.
+          </Text>
+        </View>
+      </View>
+      <View style={styles.rowGap}>
+        <Button variant="outline" size="sm" disabled={certBusy} onPress={() => { void onPickCert(); }}>
+          {certAlias ? 'Choose another' : 'Pick certificate'}
+        </Button>
+        {certAlias && (
+          <Button variant="outline" size="sm" disabled={certBusy} onPress={onClearCert}>
+            Clear
+          </Button>
+        )}
+      </View>
+    </SettingsSection>
+  );
+}
+
+// ── Password change ───────────────────────────────────────
+function PasswordChangeSection() {
+  const c = useColors();
+  const styles = React.useMemo(() => makeStyles(c), [c]);
+  const [currentPwd, setCurrentPwd] = useState('');
+  const [newPwd, setNewPwd] = useState('');
+  const [confirmPwd, setConfirmPwd] = useState('');
+  const [showCurrent, setShowCurrent] = useState(false);
+  const [showNew, setShowNew] = useState(false);
+  const [error, setError] = useState<string | null>(null);
+  const [saving, setSaving] = useState(false);
+
+  const submit = async () => {
+    setError(null);
+    if (newPwd.length < 8) { setError('New password must be at least 8 characters.'); return; }
+    if (newPwd !== confirmPwd) { setError('Passwords do not match.'); return; }
+    setSaving(true);
+    try {
+      await changePassword(currentPwd, newPwd);
+      setCurrentPwd(''); setNewPwd(''); setConfirmPwd('');
+      Alert.alert('Password changed', 'Your account password was updated.');
+    } catch (err) {
+      setError(err instanceof Error ? err.message : 'Failed to change password.');
+    } finally {
+      setSaving(false);
+    }
+  };
+
+  return (
+    <SettingsSection title="Password" description="Change the password for this account.">
+      <View style={{ gap: spacing.md }}>
+        <View style={styles.pwField}>
+          <Text style={styles.pwLabel}>Current password</Text>
+          <View style={styles.pwInputRow}>
+            <Input value={currentPwd} onChangeText={setCurrentPwd} secureTextEntry={!showCurrent} autoCapitalize="none" containerStyle={{ flex: 1 }} />
+            <Pressable style={styles.eyeBtn} onPress={() => setShowCurrent((v) => !v)}>
+              {showCurrent ? <EyeOff size={16} color={c.mutedForeground} /> : <Eye size={16} color={c.mutedForeground} />}
+            </Pressable>
           </View>
-          <View style={styles.certActions}>
-            <Button
-              variant="outline"
-              size="sm"
-              disabled={certBusy}
-              onPress={() => { void onPickCert(); }}
-            >
-              {certAlias ? 'Choose another' : 'Pick certificate'}
+        </View>
+
+        <View style={styles.pwField}>
+          <Text style={styles.pwLabel}>New password</Text>
+          <View style={styles.pwInputRow}>
+            <Input value={newPwd} onChangeText={setNewPwd} secureTextEntry={!showNew} autoCapitalize="none" containerStyle={{ flex: 1 }} />
+            <Pressable style={styles.eyeBtn} onPress={() => setShowNew((v) => !v)}>
+              {showNew ? <EyeOff size={16} color={c.mutedForeground} /> : <Eye size={16} color={c.mutedForeground} />}
+            </Pressable>
+          </View>
+        </View>
+
+        <View style={styles.pwField}>
+          <Text style={styles.pwLabel}>Confirm password</Text>
+          <Input value={confirmPwd} onChangeText={setConfirmPwd} secureTextEntry={!showNew} autoCapitalize="none" />
+        </View>
+
+        {error && <Text style={styles.errorText}>{error}</Text>}
+
+        <View style={{ alignItems: 'flex-end' }}>
+          <Button
+            size="sm"
+            loading={saving}
+            disabled={saving || !currentPwd || !newPwd || !confirmPwd}
+            onPress={() => { void submit(); }}
+            icon={<Key size={14} color={c.primaryForeground} />}
+          >
+            Change Password
+          </Button>
+        </View>
+      </View>
+    </SettingsSection>
+  );
+}
+
+// ── Display name ──────────────────────────────────────────
+function DisplayNameSection({ initial, onSaved }: { initial: string; onSaved: (name: string) => void }) {
+  const c = useColors();
+  const [name, setName] = useState(initial);
+  const [saving, setSaving] = useState(false);
+  const [saved, setSaved] = useState(false);
+
+  useEffect(() => { setName(initial); }, [initial]);
+
+  const save = async () => {
+    setSaving(true);
+    try {
+      await updateDisplayName(name);
+      onSaved(name);
+      setSaved(true);
+      setTimeout(() => setSaved(false), 2000);
+    } catch (err) {
+      Alert.alert('Update failed', err instanceof Error ? err.message : 'Failed to update display name.');
+    } finally {
+      setSaving(false);
+    }
+  };
+
+  return (
+    <SettingItem label="Display name" description="The name shown on this account.">
+      <View style={{ flexDirection: 'row', alignItems: 'center', gap: spacing.sm }}>
+        <Input value={name} onChangeText={setName} placeholder="Display name" containerStyle={{ width: 150 }} />
+        <Button size="sm" loading={saving} disabled={saving || name === initial} onPress={() => { void save(); }}>
+          {saved ? <Check size={14} color={c.primaryForeground} /> : 'Save'}
+        </Button>
+      </View>
+    </SettingItem>
+  );
+}
+
+// ── Two-factor authentication ─────────────────────────────
+function TotpSection({ enabled, onChanged }: { enabled: boolean; onChanged: () => void }) {
+  const c = useColors();
+  const styles = React.useMemo(() => makeStyles(c), [c]);
+  const [enrolment, setEnrolment] = useState<TotpEnrolment | null>(null);
+  const [disableOpen, setDisableOpen] = useState(false);
+  const [password, setPassword] = useState('');
+  const [otpCode, setOtpCode] = useState('');
+  const [error, setError] = useState<string | null>(null);
+  const [saving, setSaving] = useState(false);
+
+  const reset = () => {
+    setEnrolment(null); setDisableOpen(false);
+    setPassword(''); setOtpCode(''); setError(null);
+  };
+
+  const handleToggle = (enable: boolean) => {
+    setError(''); setPassword(''); setOtpCode('');
+    if (enable) {
+      setEnrolment(generateTotpEnrolment(jmapClient.username ?? 'account'));
+      setDisableOpen(false);
+    } else {
+      setEnrolment(null);
+      setDisableOpen(true);
+    }
+  };
+
+  const confirmEnable = async () => {
+    if (!enrolment) return;
+    if (!password) { setError('Enter your current password.'); return; }
+    if (!otpCode.trim()) { setError('Enter the 6-digit code from your app.'); return; }
+    setSaving(true);
+    try {
+      await enableTotp(password, enrolment.url, otpCode.trim());
+      reset();
+      onChanged();
+      Alert.alert('Two-factor enabled', 'You will be asked for a code at next sign-in.');
+    } catch (err) {
+      setError(err instanceof Error ? err.message : 'Failed to enable two-factor authentication.');
+    } finally {
+      setSaving(false);
+    }
+  };
+
+  const confirmDisable = async () => {
+    if (!password) { setError('Enter your current password.'); return; }
+    setSaving(true);
+    try {
+      await disableTotp(password);
+      reset();
+      onChanged();
+    } catch (err) {
+      setError(err instanceof Error ? err.message : 'Failed to disable two-factor authentication.');
+    } finally {
+      setSaving(false);
+    }
+  };
+
+  return (
+    <View style={{ gap: spacing.md }}>
+      <View style={styles.headerRow}>
+        <Shield size={16} color={c.mutedForeground} />
+        <Text style={styles.headerTitle}>Two-Factor Authentication</Text>
+      </View>
+
+      <SettingItem label="Authenticator app" description="Require a one-time code at login." noBorder>
+        <View style={{ flexDirection: 'row', alignItems: 'center', gap: spacing.sm }}>
+          <ToggleSwitch checked={enabled || !!enrolment} onChange={handleToggle} disabled={saving} />
+          <Text style={[styles.statusText, { color: enabled ? c.success : c.mutedForeground }]}>
+            {enabled ? 'Active' : 'Inactive'}
+          </Text>
+        </View>
+      </SettingItem>
+
+      {enrolment && (
+        <View style={styles.panel}>
+          <Text style={styles.panelHint}>
+            Add this secret to your authenticator app, then enter the 6-digit code to confirm.
+          </Text>
+          <Button
+            variant="outline"
+            size="sm"
+            icon={<ExternalLink size={14} color={c.text} />}
+            onPress={() => { void Linking.openURL(enrolment.url).catch(() => Alert.alert('No authenticator app', 'Could not open an authenticator app. Add the secret below manually.')); }}
+          >
+            Add to authenticator app
+          </Button>
+          <View>
+            <Text style={styles.pwLabel}>Or enter this secret manually</Text>
+            <Text selectable style={styles.secretText}>{enrolment.secretFormatted}</Text>
+          </View>
+          <View>
+            <Text style={styles.pwLabel}>Current password</Text>
+            <Input value={password} onChangeText={setPassword} secureTextEntry autoCapitalize="none" />
+          </View>
+          <View>
+            <Text style={styles.pwLabel}>Verification code</Text>
+            <Input value={otpCode} onChangeText={setOtpCode} keyboardType="number-pad" maxLength={6} />
+          </View>
+          {error ? <Text style={styles.errorText}>{error}</Text> : null}
+          <View style={styles.rowGap}>
+            <Button size="sm" loading={saving} disabled={saving || !password || !otpCode} onPress={() => { void confirmEnable(); }}>
+              Confirm
             </Button>
-            {certAlias && (
-              <Button
-                variant="outline"
-                size="sm"
-                disabled={certBusy}
-                onPress={() => { void onClearCert(); }}
-              >
-                Clear
+            <Button variant="ghost" size="sm" onPress={reset}>Cancel</Button>
+          </View>
+        </View>
+      )}
+
+      {disableOpen && (
+        <View style={styles.panel}>
+          <Text style={styles.panelHint}>Enter your password to turn off two-factor authentication.</Text>
+          <Input value={password} onChangeText={setPassword} secureTextEntry autoCapitalize="none" placeholder="Current password" />
+          {error ? <Text style={styles.errorText}>{error}</Text> : null}
+          <View style={styles.rowGap}>
+            <Button variant="destructive" size="sm" loading={saving} disabled={saving || !password} onPress={() => { void confirmDisable(); }}>
+              Disable
+            </Button>
+            <Button variant="ghost" size="sm" onPress={reset}>Cancel</Button>
+          </View>
+        </View>
+      )}
+    </View>
+  );
+}
+
+// ── App passwords / API keys ──────────────────────────────
+function parseIpList(raw: string): string[] {
+  return raw.split(/[\s,]+/).map((s) => s.trim()).filter(Boolean);
+}
+
+interface CredentialSectionProps {
+  icon: typeof Smartphone;
+  title: string;
+  description: string;
+  nameLabel: string;
+  namePlaceholder: string;
+  entries: AppCredentialInfo[];
+  onCreate: (input: AppCredentialInput) => Promise<{ id: string; secret: string }>;
+  onRemove: (id: string) => Promise<void>;
+}
+
+function CredentialSection({ icon: Icon, title, description, nameLabel, namePlaceholder, entries, onCreate, onRemove }: CredentialSectionProps) {
+  const c = useColors();
+  const styles = React.useMemo(() => makeStyles(c), [c]);
+  const [showAdd, setShowAdd] = useState(false);
+  const [name, setName] = useState('');
+  const [expiry, setExpiry] = useState<Date | null>(null);
+  const [showPicker, setShowPicker] = useState(false);
+  const [allowedIpsRaw, setAllowedIpsRaw] = useState('');
+  const [createdSecret, setCreatedSecret] = useState<string | null>(null);
+  const [saving, setSaving] = useState(false);
+
+  const resetForm = () => { setName(''); setExpiry(null); setAllowedIpsRaw(''); };
+
+  const handleAdd = async () => {
+    if (!name.trim()) return;
+    setSaving(true);
+    try {
+      const result = await onCreate({
+        description: name.trim(),
+        expiresAt: expiry ? expiry.toISOString() : null,
+        allowedIps: parseIpList(allowedIpsRaw),
+      });
+      setCreatedSecret(result.secret);
+      resetForm();
+      setShowAdd(false);
+    } catch (err) {
+      Alert.alert('Could not create', err instanceof Error ? err.message : undefined);
+    } finally {
+      setSaving(false);
+    }
+  };
+
+  const handleRemove = (id: string) => {
+    Alert.alert('Remove credential?', 'Any client using it will stop working.', [
+      { text: 'Cancel', style: 'cancel' },
+      {
+        text: 'Remove',
+        style: 'destructive',
+        onPress: async () => {
+          try {
+            await onRemove(id);
+          } catch (err) {
+            Alert.alert('Could not remove', err instanceof Error ? err.message : undefined);
+          }
+        },
+      },
+    ]);
+  };
+
+  const onPickDate = (_e: DateTimePickerEvent, date?: Date) => {
+    setShowPicker(false);
+    if (date) setExpiry(date);
+  };
+
+  return (
+    <View style={{ gap: spacing.md }}>
+      <View style={styles.headerRowBetween}>
+        <View style={styles.headerRow}>
+          <Icon size={16} color={c.mutedForeground} />
+          <Text style={styles.headerTitle}>{title}</Text>
+        </View>
+        <Button variant="outline" size="sm" icon={<Plus size={14} color={c.text} />} onPress={() => setShowAdd((v) => !v)}>
+          Add
+        </Button>
+      </View>
+      <Text style={styles.panelHint}>{description}</Text>
+
+      {createdSecret && (
+        <View style={styles.panel}>
+          <Text style={styles.panelHint}>Copy this now — it is shown only once. Tap and hold to select.</Text>
+          <Text selectable style={styles.secretText}>{createdSecret}</Text>
+          <View style={{ alignItems: 'flex-start' }}>
+            <Button variant="ghost" size="sm" onPress={() => setCreatedSecret(null)}>Done</Button>
+          </View>
+        </View>
+      )}
+
+      {showAdd && (
+        <View style={styles.panel}>
+          <View>
+            <Text style={styles.pwLabel}>{nameLabel}</Text>
+            <Input value={name} onChangeText={setName} placeholder={namePlaceholder} />
+          </View>
+          <View>
+            <Text style={styles.pwLabel}>Expires (optional)</Text>
+            <View style={styles.rowGap}>
+              <Button variant="outline" size="sm" icon={<Calendar size={14} color={c.text} />} onPress={() => setShowPicker(true)}>
+                {expiry ? expiry.toLocaleDateString() : 'No expiry'}
               </Button>
+              {expiry && (
+                <Pressable style={styles.clearExpiry} onPress={() => setExpiry(null)}>
+                  <X size={14} color={c.mutedForeground} />
+                </Pressable>
+              )}
+            </View>
+            {showPicker && (
+              <DateTimePicker value={expiry ?? new Date()} mode="date" minimumDate={new Date()} onChange={onPickDate} />
             )}
           </View>
+          <View>
+            <Text style={styles.pwLabel}>Allowed IPs (optional)</Text>
+            <Input value={allowedIpsRaw} onChangeText={setAllowedIpsRaw} placeholder="1.2.3.4, 10.0.0.0/8" autoCapitalize="none" />
+            <Text style={styles.fieldHint}>Comma or space separated. Leave empty to allow any IP.</Text>
+          </View>
+          <View style={styles.rowGap}>
+            <Button size="sm" loading={saving} disabled={saving || !name.trim()} onPress={() => { void handleAdd(); }}>Create</Button>
+            <Button variant="ghost" size="sm" onPress={() => { setShowAdd(false); resetForm(); }}>Cancel</Button>
+          </View>
+        </View>
+      )}
+
+      {entries.length > 0 ? (
+        <View style={{ gap: spacing.sm }}>
+          {entries.map((entry) => (
+            <View key={entry.id} style={styles.credRow}>
+              <View style={{ flex: 1, minWidth: 0 }}>
+                <Text style={styles.credName} numberOfLines={1}>{entry.description || entry.id}</Text>
+                {entry.createdAt && (
+                  <Text style={styles.credMeta}>
+                    {new Date(entry.createdAt).toLocaleDateString()}
+                    {entry.expiresAt ? ` · expires ${new Date(entry.expiresAt).toLocaleDateString()}` : ''}
+                  </Text>
+                )}
+                {entry.allowedIps.length > 0 && (
+                  <View style={styles.ipWrap}>
+                    {entry.allowedIps.map((ip) => (
+                      <View key={ip} style={styles.ipPill}><Text style={styles.ipText}>{ip}</Text></View>
+                    ))}
+                  </View>
+                )}
+              </View>
+              <Pressable style={styles.iconBtn} onPress={() => handleRemove(entry.id)}>
+                <Trash2 size={16} color={c.error} />
+              </Pressable>
+            </View>
+          ))}
+        </View>
+      ) : (
+        <Text style={styles.emptyText}>None yet.</Text>
+      )}
+    </View>
+  );
+}
+
+// ── Email client (OAuth accounts) ─────────────────────────
+function EmailClientSection() {
+  const c = useColors();
+  const styles = React.useMemo(() => makeStyles(c), [c]);
+  const username = jmapClient.username ?? '';
+
+  return (
+    <View style={{ gap: spacing.md }}>
+      <View style={styles.headerRow}>
+        <Monitor size={16} color={c.mutedForeground} />
+        <Text style={styles.headerTitle}>Email client setup</Text>
+      </View>
+      <Text style={styles.panelHint}>
+        To configure another mail client, use the username below and an app password (create one above) as the password.
+      </Text>
+      <View style={styles.panel}>
+        <Text style={styles.pwLabel}>JMAP / IMAP username</Text>
+        <Text selectable style={styles.secretText}>{username}</Text>
+      </View>
+    </View>
+  );
+}
+
+// ── Encryption at rest (read-only status) ─────────────────
+function EncryptionSection({ type }: { type: EncryptionType }) {
+  const c = useColors();
+  const styles = React.useMemo(() => makeStyles(c), [c]);
+  const enabled = type !== 'Disabled';
+  return (
+    <View style={{ gap: spacing.md }}>
+      <View style={styles.headerRow}>
+        <Lock size={16} color={c.mutedForeground} />
+        <Text style={styles.headerTitle}>Encryption at rest</Text>
+      </View>
+      <SettingItem label="Stored message encryption" description="Server-side encryption of stored messages." noBorder>
+        <Text style={[styles.statusText, { color: enabled ? c.success : c.mutedForeground }]}>
+          {enabled ? `Active (${type})` : 'Disabled'}
+        </Text>
+      </SettingItem>
+    </View>
+  );
+}
+
+// ── Screen ────────────────────────────────────────────────
+export function AccountSecuritySettings() {
+  const c = useColors();
+  const styles = React.useMemo(() => makeStyles(c), [c]);
+  const certSupported = isClientCertSupported();
+  const isOAuth = jmapClient.usesBearerAuth;
+
+  // null = still probing; false = server lacks the Stalwart extension.
+  const [supported, setSupported] = useState<boolean | null>(null);
+  const [auth, setAuth] = useState<AuthInfo | null>(null);
+  const [displayName, setDisplayName] = useState('');
+  const [encryption, setEncryption] = useState<EncryptionType>('Disabled');
+  const [loadError, setLoadError] = useState<string | null>(null);
+
+  const reloadAuth = useCallback(async () => {
+    try {
+      setAuth(await fetchAuthInfo());
+    } catch (err) {
+      setLoadError(err instanceof Error ? err.message : 'Failed to load security settings.');
+    }
+  }, []);
+
+  useEffect(() => {
+    let cancelled = false;
+    const session = jmapClient.currentSession;
+    if (!session) { setSupported(false); return; }
+    if (!isStalwartSupported()) { setSupported(false); return; }
+    setSupported(true);
+
+    (async () => {
+      try {
+        const authInfo = await fetchAuthInfo();
+        if (cancelled) return;
+        setAuth(authInfo);
+        if (!isOAuth) {
+          // Principal + crypto only matter for password accounts; failures are
+          // non-fatal (e.g. a non-admin principal read is forbidden).
+          const [principal, enc] = await Promise.allSettled([fetchPrincipal(), fetchEncryptionType()]);
+          if (cancelled) return;
+          if (principal.status === 'fulfilled') setDisplayName(principal.value.displayName);
+          if (enc.status === 'fulfilled') setEncryption(enc.value);
+        }
+      } catch (err) {
+        if (!cancelled) setLoadError(err instanceof Error ? err.message : 'Failed to load security settings.');
+      }
+    })();
+
+    return () => { cancelled = true; };
+  }, [isOAuth]);
+
+  return (
+    <View style={styles.container}>
+      {certSupported && <ClientCertSection />}
+
+      {supported === null && (
+        <View style={styles.loadingRow}>
+          <ActivityIndicator color={c.mutedForeground} />
+          <Text style={styles.panelHint}>Detecting server features…</Text>
+        </View>
+      )}
+
+      {supported === false && (
+        <SettingsSection title="Account security" description="Manage your password, two-factor authentication, and app credentials.">
+          <Text style={styles.emptyText}>
+            Account security management requires a Stalwart server. These features are not available for this account.
+          </Text>
         </SettingsSection>
       )}
 
-      <SettingsSection title="Password" description="Change the password for this account.">
-        <View style={{ gap: spacing.md }}>
-          <View style={styles.pwField}>
-            <Text style={styles.pwLabel}>Current password</Text>
-            <View style={styles.pwInputRow}>
-              <Input
-                value={currentPwd}
-                onChangeText={setCurrentPwd}
-                secureTextEntry={!showCurrent}
-                containerStyle={{ flex: 1 }}
-              />
-              <Pressable style={styles.eyeBtn} onPress={() => setShowCurrent((v) => !v)}>
-                {showCurrent ? (
-                  <EyeOff size={16} color={c.mutedForeground} />
-                ) : (
-                  <Eye size={16} color={c.mutedForeground} />
-                )}
-              </Pressable>
-            </View>
-          </View>
+      {supported && (
+        <SettingsSection title="Account security" description="Manage your password, two-factor authentication, and app credentials.">
+          <View style={{ gap: spacing.xxxl }}>
+            {loadError ? <Text style={styles.errorText}>{loadError}</Text> : null}
 
-          <View style={styles.pwField}>
-            <Text style={styles.pwLabel}>New password</Text>
-            <View style={styles.pwInputRow}>
-              <Input
-                value={newPwd}
-                onChangeText={setNewPwd}
-                secureTextEntry={!showNew}
-                containerStyle={{ flex: 1 }}
-              />
-              <Pressable style={styles.eyeBtn} onPress={() => setShowNew((v) => !v)}>
-                {showNew ? (
-                  <EyeOff size={16} color={c.mutedForeground} />
-                ) : (
-                  <Eye size={16} color={c.mutedForeground} />
-                )}
-              </Pressable>
-            </View>
-          </View>
-
-          <View style={styles.pwField}>
-            <Text style={styles.pwLabel}>Confirm password</Text>
-            <Input
-              value={confirmPwd}
-              onChangeText={setConfirmPwd}
-              secureTextEntry={!showNew}
-            />
-          </View>
-
-          <View style={{ alignItems: 'flex-end' }}>
-            <Button size="sm" icon={<Key size={14} color={c.primaryForeground} />}>
-              Change Password
-            </Button>
-          </View>
-        </View>
-      </SettingsSection>
-
-      <SettingsSection title="Two-Factor Authentication" description="Add an extra layer of security with an authenticator app.">
-        <SettingItem label="Enable 2FA" description="Require a one-time code at login.">
-          <ToggleSwitch checked={twoFactor} onChange={setTwoFactor} />
-        </SettingItem>
-
-        {twoFactor && (
-          <View style={styles.infoBox}>
-            <Smartphone size={16} color={c.primary} />
-            <Text style={styles.infoText}>
-              Scan the QR code in your authenticator app to finish setup.
-            </Text>
-          </View>
-        )}
-      </SettingsSection>
-
-      <SettingsSection title="App Passwords" description="Generate passwords for other mail clients.">
-        {appPwds.length === 0 ? (
-          <View style={styles.empty}>
-            <Lock size={24} color={c.mutedForeground} />
-            <Text style={styles.emptyText}>No app passwords yet.</Text>
-          </View>
-        ) : null}
-        <View style={{ alignItems: 'flex-start' }}>
-          <Button variant="outline" size="sm">
-            Generate New
-          </Button>
-        </View>
-      </SettingsSection>
-
-      <SettingsSection title="Active Sessions" description="Devices currently signed into your account.">
-        {MOCK_SESSIONS.map((s) => (
-          <View key={s.id} style={styles.sessionRow}>
-            <View style={styles.sessionIcon}>
-              <Monitor size={18} color={c.text} />
-            </View>
-            <View style={{ flex: 1 }}>
-              <Text style={styles.sessionDevice}>{s.device}</Text>
-              <Text style={styles.sessionMeta}>
-                {s.location} · {s.current ? 'Current' : 'Active'}
-              </Text>
-            </View>
-            {!s.current && (
-              <Pressable style={styles.trashBtn}>
-                <Trash2 size={16} color={c.error} />
-              </Pressable>
+            {!isOAuth && (
+              <>
+                <PasswordChangeSection />
+                <DisplayNameSection initial={displayName} onSaved={setDisplayName} />
+                <TotpSection enabled={!!auth?.otpEnabled} onChanged={() => { void reloadAuth(); }} />
+              </>
             )}
+
+            <CredentialSection
+              icon={Smartphone}
+              title="App passwords"
+              description="Generate passwords for other mail clients that can't do interactive login."
+              nameLabel="Name"
+              namePlaceholder="e.g. Thunderbird laptop"
+              entries={auth?.appPasswords ?? []}
+              onCreate={async (input) => { const r = await createAppPassword(input); await reloadAuth(); return r; }}
+              onRemove={async (id) => { await removeAppPassword(id); await reloadAuth(); }}
+            />
+
+            <CredentialSection
+              icon={Terminal}
+              title="API keys"
+              description="Tokens for scripts and integrations that use the JMAP API."
+              nameLabel="Name"
+              namePlaceholder="e.g. Backup script"
+              entries={auth?.apiKeys ?? []}
+              onCreate={async (input) => { const r = await createApiKey(input); await reloadAuth(); return r; }}
+              onRemove={async (id) => { await removeApiKey(id); await reloadAuth(); }}
+            />
+
+            {isOAuth && <EmailClientSection />}
+            {!isOAuth && <EncryptionSection type={encryption} />}
           </View>
-        ))}
-      </SettingsSection>
+        </SettingsSection>
+      )}
     </View>
   );
 }
 
 function makeStyles(c: ThemePalette) {
   return StyleSheet.create({
-  container: { gap: spacing.xxxl },
-  pwField: { gap: 4 },
-  pwLabel: { ...typography.caption, color: c.mutedForeground },
-  pwInputRow: { flexDirection: 'row', alignItems: 'center', gap: spacing.sm },
-  eyeBtn: { padding: spacing.sm },
-  infoBox: {
-    flexDirection: 'row',
-    gap: spacing.sm,
-    padding: spacing.md,
-    backgroundColor: c.primaryBg,
-    borderRadius: radius.sm,
-    alignItems: 'center',
-  },
-  infoText: {
-    ...typography.caption,
-    color: c.primary,
-    flex: 1,
-  },
-  empty: {
-    alignItems: 'center',
-    padding: spacing.xl,
-    gap: spacing.sm,
-  },
-  emptyText: {
-    ...typography.body,
-    color: c.mutedForeground,
-  },
-  sessionRow: {
-    flexDirection: 'row',
-    alignItems: 'center',
-    gap: spacing.md,
-    paddingVertical: spacing.md,
-    borderBottomWidth: 1,
-    borderBottomColor: c.border,
-  },
-  sessionIcon: {
-    width: 36,
-    height: 36,
-    borderRadius: radius.sm,
-    backgroundColor: c.muted,
-    alignItems: 'center',
-    justifyContent: 'center',
-  },
-  sessionDevice: { ...typography.bodyMedium, color: c.text },
-  sessionMeta: { ...typography.caption, color: c.mutedForeground, marginTop: 2 },
-  trashBtn: {
-    width: 32,
-    height: 32,
-    alignItems: 'center',
-    justifyContent: 'center',
-    borderRadius: radius.sm,
-  },
-  certRow: {
-    flexDirection: 'row',
-    alignItems: 'flex-start',
-    gap: spacing.md,
-    paddingVertical: spacing.md,
-  },
-  certStatus: { ...typography.bodyMedium, color: c.text },
-  certHint: { ...typography.caption, color: c.mutedForeground, marginTop: 4 },
-  certActions: { flexDirection: 'row', gap: spacing.sm, flexWrap: 'wrap' },
-});
+    container: { gap: spacing.xxxl },
+    rowGap: { flexDirection: 'row', gap: spacing.sm, flexWrap: 'wrap', alignItems: 'center' },
+    loadingRow: { flexDirection: 'row', alignItems: 'center', gap: spacing.sm, paddingVertical: spacing.lg },
+
+    headerRow: { flexDirection: 'row', alignItems: 'center', gap: spacing.sm },
+    headerRowBetween: { flexDirection: 'row', alignItems: 'center', justifyContent: 'space-between' },
+    headerTitle: { ...typography.bodyMedium, color: c.text },
+
+    statusText: { ...typography.caption, fontWeight: '500' },
+
+    pwField: { gap: 4 },
+    pwLabel: { ...typography.caption, color: c.mutedForeground, marginBottom: 4 },
+    pwInputRow: { flexDirection: 'row', alignItems: 'center', gap: spacing.sm },
+    eyeBtn: { padding: spacing.sm },
+    fieldHint: { ...typography.caption, color: c.mutedForeground, marginTop: 4, fontSize: 11 },
+    errorText: { ...typography.caption, color: c.error },
+
+    panel: {
+      gap: spacing.md,
+      padding: spacing.md,
+      borderRadius: radius.md,
+      backgroundColor: c.muted,
+    },
+    panelHint: { ...typography.caption, color: c.mutedForeground },
+    secretText: {
+      ...typography.body,
+      fontFamily: 'monospace',
+      color: c.text,
+      backgroundColor: c.background,
+      borderWidth: 1,
+      borderColor: c.border,
+      borderRadius: radius.sm,
+      paddingHorizontal: spacing.md,
+      paddingVertical: spacing.sm,
+    },
+    clearExpiry: { width: 32, height: 32, alignItems: 'center', justifyContent: 'center', borderRadius: radius.sm },
+
+    credRow: {
+      flexDirection: 'row',
+      alignItems: 'flex-start',
+      justifyContent: 'space-between',
+      gap: spacing.md,
+      padding: spacing.md,
+      borderRadius: radius.md,
+      borderWidth: 1,
+      borderColor: c.border,
+    },
+    credName: { ...typography.bodyMedium, color: c.text },
+    credMeta: { ...typography.caption, color: c.mutedForeground, marginTop: 2 },
+    ipWrap: { flexDirection: 'row', flexWrap: 'wrap', gap: 4, marginTop: 4 },
+    ipPill: { paddingHorizontal: 6, paddingVertical: 2, borderRadius: radius.xs, backgroundColor: c.background, borderWidth: 1, borderColor: c.border },
+    ipText: { fontSize: 10, fontFamily: 'monospace', color: c.mutedForeground },
+    iconBtn: { width: 32, height: 32, alignItems: 'center', justifyContent: 'center', borderRadius: radius.sm },
+    emptyText: { ...typography.caption, color: c.mutedForeground, fontStyle: 'italic' },
+
+    // TLS client cert
+    certRow: { flexDirection: 'row', alignItems: 'flex-start', gap: spacing.md, paddingVertical: spacing.md },
+    certStatus: { ...typography.bodyMedium, color: c.text },
+    certHint: { ...typography.caption, color: c.mutedForeground, marginTop: 4 },
+  });
 }

src/components/settings/ComposingSettings.tsx

@@ -16,6 +16,8 @@ export function ComposingSettings() {
   const setAttachmentReminderEnabled = useSettingsStore((s) => s.setAttachmentReminderEnabled);
   const attachmentReminderKeywords = useSettingsStore((s) => s.attachmentReminderKeywords);
   const setAttachmentReminderKeywords = useSettingsStore((s) => s.setAttachmentReminderKeywords);
+  const sendDelaySeconds = useSettingsStore((s) => s.sendDelaySeconds);
+  const updateSetting = useSettingsStore((s) => s.updateSetting);
   const hydrated = useSettingsStore((s) => s.hydrated);
   const hydrate = useSettingsStore((s) => s.hydrate);
 
@@ -37,6 +39,14 @@ export function ComposingSettings() {
     setAttachmentReminderKeywords(attachmentReminderKeywords.filter((k) => k !== kw));
   };
 
+  const SEND_DELAY_OPTIONS: { label: string; value: number }[] = [
+    { label: 'Off', value: 0 },
+    { label: '5s', value: 5 },
+    { label: '10s', value: 10 },
+    { label: '20s', value: 20 },
+    { label: '30s', value: 30 },
+  ];
+
   return (
     <SettingsSection
       title="Composing"
@@ -49,6 +59,29 @@ export function ComposingSettings() {
         <ToggleSwitch checked={autoSelectReplyIdentity} onChange={setAutoSelectReplyIdentity} />
       </SettingItem>
 
+      <View style={styles.subBlock}>
+        <Text style={styles.subLabel}>Undo send delay</Text>
+        <Text style={styles.subDescription}>
+          Hold outgoing mail for a few seconds so you can cancel it. Requires server support.
+        </Text>
+        <View style={styles.segmentRow}>
+          {SEND_DELAY_OPTIONS.map((opt) => {
+            const active = sendDelaySeconds === opt.value;
+            return (
+              <Pressable
+                key={opt.value}
+                onPress={() => updateSetting('sendDelaySeconds', opt.value)}
+                style={[styles.segment, active && styles.segmentActive]}
+              >
+                <Text style={[styles.segmentText, active && styles.segmentTextActive]}>
+                  {opt.label}
+                </Text>
+              </Pressable>
+            );
+          })}
+        </View>
+      </View>
+
       <SettingItem
         label="Attachment reminder"
         description="Warn before sending if the message mentions an attachment but none is attached."
@@ -110,6 +143,19 @@ function makeStyles(c: ThemePalette) {
   subBlock: { paddingVertical: spacing.md, gap: spacing.sm },
   subLabel: { ...typography.bodyMedium, color: c.text },
   subDescription: { ...typography.caption, color: c.mutedForeground },
+  segmentRow: { flexDirection: 'row', gap: 6, marginTop: 4 },
+  segment: {
+    flex: 1,
+    alignItems: 'center',
+    paddingVertical: 8,
+    borderRadius: radius.sm,
+    borderWidth: 1,
+    borderColor: c.border,
+    backgroundColor: c.background,
+  },
+  segmentActive: { backgroundColor: c.primary, borderColor: c.primary },
+  segmentText: { ...typography.caption, color: c.text },
+  segmentTextActive: { color: c.primaryForeground, fontWeight: '600' },
   chips: { flexDirection: 'row', flexWrap: 'wrap', gap: 6 },
   chip: {
     flexDirection: 'row',

src/components/settings/ContactsSettings.tsx

@@ -1,30 +1,57 @@
 import React from 'react';
-import { Alert, Share, Text } from 'react-native';
+import { Alert, Share, Text, View, StyleSheet, Pressable, TextInput } from 'react-native';
 import * as FileSystem from 'expo-file-system/legacy';
 import * as Sharing from 'expo-sharing';
-import { Download } from 'lucide-react-native';
+import {
+  Download, Upload, Plus, Pencil, Trash2, Check, X, BookUser,
+} from 'lucide-react-native';
 import { SettingsSection, SettingItem, ToggleSwitch } from './settings-section';
 import Button from '../Button';
+import Dialog from '../Dialog';
+import { ContactImportSheet } from '../contacts';
 import { useSettingsStore } from '../../stores/settings-store';
-import { useContactsStore } from '../../stores/contacts-store';
+import { useContactsStore, selectAddressBooksWithCount } from '../../stores/contacts-store';
 import { contactsToVCard } from '../../lib/vcard';
 import { isGroup } from '../../lib/contact-utils';
-import { typography, type ThemePalette } from '../../theme/tokens';
+import { spacing, radius, typography, componentSizes, type ThemePalette } from '../../theme/tokens';
 import { useColors } from '../../theme/colors';
 
 export function ContactsSettings() {
   const c = useColors();
+  const styles = React.useMemo(() => makeStyles(c), [c]);
   const groupByLetter = useSettingsStore((s) => s.groupContactsByLetter);
   const setGroupByLetter = useSettingsStore((s) => s.setGroupContactsByLetter);
   const contacts = useContactsStore((s) => s.contacts);
+  const addressBooks = useContactsStore((s) => s.addressBooks);
+  // Derive in a memo from stable store fields. Subscribing with
+  // `selectAddressBooksWithCount` directly returns a new array each call and
+  // sends useSyncExternalStore into an infinite render loop.
+  const books = React.useMemo(
+    () => selectAddressBooksWithCount(addressBooks, contacts),
+    [addressBooks, contacts],
+  );
+  const fetchAddressBooks = useContactsStore((s) => s.fetchAddressBooks);
+  const fetchContacts = useContactsStore((s) => s.fetchContacts);
+  const createAddressBook = useContactsStore((s) => s.createAddressBook);
+  const renameAddressBook = useContactsStore((s) => s.renameAddressBook);
+  const deleteAddressBook = useContactsStore((s) => s.deleteAddressBook);
 
   const [exporting, setExporting] = React.useState(false);
+  const [importOpen, setImportOpen] = React.useState(false);
 
-  const exportable = React.useMemo(() => contacts.filter((c) => !isGroup(c)), [contacts]);
+  const [editingId, setEditingId] = React.useState<string | null>(null);
+  const [editName, setEditName] = React.useState('');
+  const [adding, setAdding] = React.useState(false);
+  const [newName, setNewName] = React.useState('');
+  const [busy, setBusy] = React.useState(false);
+  const [deleteTarget, setDeleteTarget] = React.useState<{ id: string; name: string; count: number } | null>(null);
+
+  const exportable = React.useMemo(() => contacts.filter((cc) => !isGroup(cc)), [contacts]);
   const exportLabel =
     exportable.length === 0
       ? 'No contacts to export'
       : `Export ${exportable.length} contact${exportable.length === 1 ? '' : 's'} as a single vCard file.`;
+  const importTargetBookId = books[0]?.id ?? null;
 
   const handleExport = async () => {
     if (exportable.length === 0 || exporting) return;
@@ -50,40 +77,256 @@ export function ContactsSettings() {
     }
   };
 
+  const startRename = (id: string, name: string) => {
+    setAdding(false);
+    setEditingId(id);
+    setEditName(name);
+  };
+
+  const commitRename = async () => {
+    const name = editName.trim();
+    if (!editingId || !name || busy) { setEditingId(null); return; }
+    setBusy(true);
+    try {
+      await renameAddressBook(editingId, name);
+      setEditingId(null);
+    } catch (err) {
+      Alert.alert('Rename failed', err instanceof Error ? err.message : 'Unknown error');
+    } finally {
+      setBusy(false);
+    }
+  };
+
+  const commitCreate = async () => {
+    const name = newName.trim();
+    if (!name || busy) return;
+    setBusy(true);
+    try {
+      await createAddressBook(name);
+      setAdding(false);
+      setNewName('');
+    } catch (err) {
+      Alert.alert('Could not create address book', err instanceof Error ? err.message : 'Unknown error');
+    } finally {
+      setBusy(false);
+    }
+  };
+
+  const confirmDelete = async () => {
+    if (!deleteTarget) return;
+    const { id } = deleteTarget;
+    setDeleteTarget(null);
+    try {
+      await deleteAddressBook(id);
+    } catch (err) {
+      Alert.alert('Delete failed', err instanceof Error ? err.message : 'Unknown error');
+    }
+  };
+
   return (
-    <SettingsSection
-      title="Contacts"
-      description="Display preferences and address-book tools."
-    >
-      <SettingItem
-        label="Group by first letter"
-        description="Show alphabetical section headers in the contacts list."
+    <>
+      <SettingsSection
+        title="Contacts"
+        description="Display preferences and address-book tools."
       >
-        <ToggleSwitch checked={groupByLetter} onChange={setGroupByLetter} />
-      </SettingItem>
-
-      <SettingItem
-        label="Export contacts"
-        description={exportLabel}
-      >
-        <Button
-          variant="outline"
-          size="sm"
-          icon={<Download size={14} color={c.text} />}
-          onPress={() => { void handleExport(); }}
-          disabled={exportable.length === 0 || exporting}
-          loading={exporting}
+        <SettingItem
+          label="Group by first letter"
+          description="Show alphabetical section headers in the contacts list."
         >
-          Export
-        </Button>
-      </SettingItem>
+          <ToggleSwitch checked={groupByLetter} onChange={setGroupByLetter} />
+        </SettingItem>
 
-      <SettingItem
-        label="Import contacts"
-        description="Importing vCard files is currently available on the web client only."
+        <SettingItem
+          label="Import contacts"
+          description="Import contacts from a vCard (.vcf) file with duplicate detection."
+        >
+          <Button
+            variant="outline"
+            size="sm"
+            icon={<Upload size={14} color={c.text} />}
+            onPress={() => setImportOpen(true)}
+            disabled={books.length === 0}
+          >
+            Import
+          </Button>
+        </SettingItem>
+
+        <SettingItem
+          label="Export contacts"
+          description={exportLabel}
+        >
+          <Button
+            variant="outline"
+            size="sm"
+            icon={<Download size={14} color={c.text} />}
+            onPress={() => { void handleExport(); }}
+            disabled={exportable.length === 0 || exporting}
+            loading={exporting}
+          >
+            Export
+          </Button>
+        </SettingItem>
+      </SettingsSection>
+
+      <SettingsSection
+        title="Address books"
+        description="Create, rename, and remove the address books that organize your contacts."
       >
-        <Text style={[typography.caption, { color: c.textMuted }]}>Web only</Text>
-      </SettingItem>
-    </SettingsSection>
+        {books.map((book) => (
+          <View key={book.id} style={styles.bookRow}>
+            <BookUser size={16} color={c.textSecondary} />
+            {editingId === book.id ? (
+              <>
+                <TextInput
+                  style={styles.bookInput}
+                  value={editName}
+                  onChangeText={setEditName}
+                  autoFocus
+                  returnKeyType="done"
+                  onSubmitEditing={() => { void commitRename(); }}
+                  placeholderTextColor={c.textMuted}
+                />
+                <Pressable onPress={() => { void commitRename(); }} hitSlop={6} style={styles.iconBtn}>
+                  <Check size={16} color={c.primary} />
+                </Pressable>
+                <Pressable onPress={() => setEditingId(null)} hitSlop={6} style={styles.iconBtn}>
+                  <X size={16} color={c.textMuted} />
+                </Pressable>
+              </>
+            ) : (
+              <>
+                <View style={{ flex: 1, minWidth: 0 }}>
+                  <Text style={styles.bookName} numberOfLines={1}>{book.name}</Text>
+                  <Text style={styles.bookCount}>
+                    {book.count} contact{book.count === 1 ? '' : 's'}
+                  </Text>
+                </View>
+                {book.myRights?.mayWrite !== false && (
+                  <Pressable onPress={() => startRename(book.id, book.name)} hitSlop={6} style={styles.iconBtn}>
+                    <Pencil size={15} color={c.textSecondary} />
+                  </Pressable>
+                )}
+                {book.myRights?.mayDelete !== false && books.length > 1 && (
+                  <Pressable
+                    onPress={() => setDeleteTarget({ id: book.id, name: book.name, count: book.count })}
+                    hitSlop={6}
+                    style={styles.iconBtn}
+                  >
+                    <Trash2 size={15} color={c.error} />
+                  </Pressable>
+                )}
+              </>
+            )}
+          </View>
+        ))}
+
+        {adding ? (
+          <View style={styles.bookRow}>
+            <BookUser size={16} color={c.textSecondary} />
+            <TextInput
+              style={styles.bookInput}
+              value={newName}
+              onChangeText={setNewName}
+              placeholder="New address book name"
+              placeholderTextColor={c.textMuted}
+              autoFocus
+              returnKeyType="done"
+              onSubmitEditing={() => { void commitCreate(); }}
+            />
+            <Pressable
+              onPress={() => { void commitCreate(); }}
+              disabled={!newName.trim() || busy}
+              hitSlop={6}
+              style={styles.iconBtn}
+            >
+              <Check size={16} color={c.primary} />
+            </Pressable>
+            <Pressable onPress={() => { setAdding(false); setNewName(''); }} hitSlop={6} style={styles.iconBtn}>
+              <X size={16} color={c.textMuted} />
+            </Pressable>
+          </View>
+        ) : (
+          <Pressable
+            style={styles.addRow}
+            onPress={() => { setEditingId(null); setAdding(true); }}
+          >
+            <Plus size={16} color={c.primary} />
+            <Text style={styles.addLabel}>New address book</Text>
+          </Pressable>
+        )}
+
+        <View style={{ marginTop: spacing.sm }}>
+          <Button
+            variant="ghost"
+            size="sm"
+            onPress={() => { void fetchAddressBooks(); void fetchContacts(); }}
+          >
+            Refresh
+          </Button>
+        </View>
+      </SettingsSection>
+
+      <ContactImportSheet
+        visible={importOpen}
+        onClose={() => setImportOpen(false)}
+        targetBookId={importTargetBookId}
+        targetBookName={books[0]?.name}
+        onImported={() => { void fetchContacts(); }}
+      />
+
+      <Dialog
+        visible={deleteTarget !== null}
+        title="Delete address book"
+        message={
+          deleteTarget
+            ? `Delete "${deleteTarget.name}"?${deleteTarget.count > 0 ? ` Its ${deleteTarget.count} contact${deleteTarget.count === 1 ? '' : 's'} will be removed from this book.` : ''} This cannot be undone.`
+            : ''
+        }
+        variant="destructive"
+        confirmText="Delete"
+        onConfirm={() => { void confirmDelete(); }}
+        onCancel={() => setDeleteTarget(null)}
+      />
+    </>
   );
 }
+
+function makeStyles(c: ThemePalette) {
+  return StyleSheet.create({
+    bookRow: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      gap: spacing.sm,
+      paddingVertical: spacing.sm,
+      borderBottomWidth: 1,
+      borderBottomColor: c.borderLight,
+    },
+    bookName: { ...typography.body, color: c.text },
+    bookCount: { ...typography.caption, color: c.textMuted, marginTop: 1 },
+    bookInput: {
+      flex: 1,
+      ...typography.body,
+      color: c.text,
+      height: componentSizes.inputHeight,
+      paddingHorizontal: spacing.md,
+      borderWidth: 1,
+      borderColor: c.border,
+      borderRadius: radius.sm,
+      backgroundColor: c.background,
+    },
+    iconBtn: {
+      width: 32,
+      height: 32,
+      alignItems: 'center',
+      justifyContent: 'center',
+      borderRadius: radius.sm,
+    },
+    addRow: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      gap: spacing.sm,
+      paddingVertical: spacing.md,
+    },
+    addLabel: { ...typography.body, color: c.primary },
+  });
+}

src/components/settings/DownloadsSettings.tsx

@@ -0,0 +1,173 @@
+import React, { useEffect } from 'react';
+import { View, Text, StyleSheet, Pressable } from 'react-native';
+import { RotateCcw } from 'lucide-react-native';
+import { SettingsSection, SettingItem, RadioGroup, ToggleSwitch } from './settings-section';
+import Input from '../Input';
+import { spacing, radius, typography, type ThemePalette } from '../../theme/tokens';
+import { useColors } from '../../theme/colors';
+import { useSettingsStore, type SpaceReplacement } from '../../stores/settings-store';
+import {
+  emailExportFilename,
+  attachmentDownloadFilename,
+  buildSampleEmail,
+  EMAIL_TOKENS,
+  ATTACHMENT_TOKENS,
+  DEFAULT_EMAIL_TEMPLATE,
+  DEFAULT_ATTACHMENT_TEMPLATE,
+  type EmailFilenameOptions,
+} from '../../lib/download-filename';
+
+const SAMPLE = buildSampleEmail();
+const SAMPLE_ATTACHMENT = { name: 'Rechnung 2026.pdf', type: 'application/pdf' };
+
+export function DownloadsSettings() {
+  const c = useColors();
+  const styles = React.useMemo(() => makeStyles(c), [c]);
+  const hydrated = useSettingsStore((s) => s.hydrated);
+  const hydrate = useSettingsStore((s) => s.hydrate);
+  const update = useSettingsStore((s) => s.updateSetting);
+
+  const emailTemplate = useSettingsStore((s) => s.emailExportTemplate);
+  const attachmentTemplate = useSettingsStore((s) => s.attachmentExportTemplate);
+  const spaceReplacement = useSettingsStore((s) => s.exportSpaceReplacement);
+  const lowercase = useSettingsStore((s) => s.exportLowercase);
+  const stripDiacritics = useSettingsStore((s) => s.exportStripDiacritics);
+
+  useEffect(() => { if (!hydrated) void hydrate(); }, [hydrated, hydrate]);
+
+  const transforms: EmailFilenameOptions = { spaceReplacement, lowercase, stripDiacritics };
+  const emailPreview = emailExportFilename(SAMPLE, { ...transforms, template: emailTemplate });
+  const attachmentPreview = attachmentDownloadFilename(SAMPLE, SAMPLE_ATTACHMENT, {
+    ...transforms,
+    template: attachmentTemplate,
+  });
+
+  return (
+    <View style={{ gap: spacing.xxxl }}>
+      <SettingsSection
+        title="Email Filename"
+        description="Template used when exporting a message as an .eml file."
+      >
+        <Input
+          value={emailTemplate}
+          onChangeText={(v) => update('emailExportTemplate', v)}
+          autoCapitalize="none"
+          autoCorrect={false}
+        />
+        <Pressable
+          onPress={() => update('emailExportTemplate', DEFAULT_EMAIL_TEMPLATE)}
+          style={styles.resetRow}
+        >
+          <RotateCcw size={12} color={c.mutedForeground} />
+          <Text style={styles.resetText}>Reset to default</Text>
+        </Pressable>
+        <View style={styles.previewBox}>
+          <Text style={styles.previewLabel}>Preview</Text>
+          <Text style={styles.previewValue}>{emailPreview}</Text>
+        </View>
+        <TokenList tokens={EMAIL_TOKENS} styles={styles} />
+      </SettingsSection>
+
+      <SettingsSection
+        title="Attachment Filename"
+        description="Template used when saving or sharing an attachment."
+      >
+        <Input
+          value={attachmentTemplate}
+          onChangeText={(v) => update('attachmentExportTemplate', v)}
+          autoCapitalize="none"
+          autoCorrect={false}
+        />
+        <Pressable
+          onPress={() => update('attachmentExportTemplate', DEFAULT_ATTACHMENT_TEMPLATE)}
+          style={styles.resetRow}
+        >
+          <RotateCcw size={12} color={c.mutedForeground} />
+          <Text style={styles.resetText}>Reset to default</Text>
+        </Pressable>
+        <View style={styles.previewBox}>
+          <Text style={styles.previewLabel}>Preview</Text>
+          <Text style={styles.previewValue}>{attachmentPreview}</Text>
+        </View>
+        <TokenList tokens={ATTACHMENT_TOKENS} styles={styles} />
+      </SettingsSection>
+
+      <SettingsSection
+        title="Filename Transform"
+        description="Applied to every exported filename."
+      >
+        <View style={styles.group}>
+          <SettingItem label="Spaces" description="Replace spaces in filenames." noBorder />
+          <RadioGroup
+            value={spaceReplacement}
+            onChange={(v) => update('exportSpaceReplacement', v as SpaceReplacement)}
+            options={[
+              { value: 'keep', label: 'Keep' },
+              { value: 'underscore', label: 'Underscore' },
+              { value: 'dash', label: 'Dash' },
+            ]}
+          />
+        </View>
+
+        <SettingItem label="Lowercase" description="Force the whole filename to lowercase.">
+          <ToggleSwitch checked={lowercase} onChange={(v) => update('exportLowercase', v)} />
+        </SettingItem>
+
+        <SettingItem
+          label="Strip Accents"
+          description="Convert accented letters to plain ASCII (ä → a)."
+        >
+          <ToggleSwitch checked={stripDiacritics} onChange={(v) => update('exportStripDiacritics', v)} />
+        </SettingItem>
+      </SettingsSection>
+    </View>
+  );
+}
+
+function TokenList({
+  tokens,
+  styles,
+}: {
+  tokens: { token: string; description: string }[];
+  styles: ReturnType<typeof makeStyles>;
+}) {
+  return (
+    <View style={styles.tokenWrap}>
+      {tokens.map((t) => (
+        <View key={t.token} style={styles.tokenPill}>
+          <Text style={styles.tokenText}>{`{${t.token}}`}</Text>
+        </View>
+      ))}
+    </View>
+  );
+}
+
+function makeStyles(c: ThemePalette) {
+  return StyleSheet.create({
+    group: { gap: spacing.sm },
+    resetRow: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      gap: 4,
+      marginTop: spacing.sm,
+    },
+    resetText: { ...typography.caption, color: c.mutedForeground },
+    previewBox: {
+      marginTop: spacing.md,
+      padding: spacing.md,
+      borderRadius: radius.md,
+      backgroundColor: c.muted,
+      gap: 2,
+    },
+    previewLabel: { fontSize: 11, fontWeight: '600', color: c.mutedForeground, textTransform: 'uppercase' },
+    previewValue: { ...typography.captionMedium, color: c.text },
+    tokenWrap: { flexDirection: 'row', flexWrap: 'wrap', gap: 4, marginTop: spacing.md },
+    tokenPill: {
+      paddingHorizontal: 6,
+      paddingVertical: 2,
+      borderRadius: radius.xs,
+      backgroundColor: c.muted,
+    },
+    tokenText: { fontSize: 11, color: c.mutedForeground },
+  });
+}

src/components/settings/FilterSettings.tsx

@@ -1,184 +1,464 @@
-import React, { useEffect, useState } from 'react';
-import { View, Text, StyleSheet, Pressable } from 'react-native';
-import { Plus, GripVertical, X, Code, Filter, AlertTriangle, RotateCcw } from 'lucide-react-native';
+import React, { useCallback, useEffect, useMemo, useState } from 'react';
+import { View, Text, StyleSheet, Pressable, ActivityIndicator, Alert } from 'react-native';
+import {
+  Plus, X, Code, AlertTriangle, Filter, RotateCcw, Lock,
+  ChevronUp, ChevronDown, Palmtree,
+} from 'lucide-react-native';
 import { SettingsSection, ToggleSwitch } from './settings-section';
 import Button from '../Button';
 import { spacing, radius, typography, type ThemePalette } from '../../theme/tokens';
 import { useColors } from '../../theme/colors';
 import { useSettingsStore } from '../../stores/settings-store';
+import { useFilterStore } from '../../stores/filter-store';
+import { useVacationStore } from '../../stores/vacation-store';
+import { useEmailStore } from '../../stores/email-store';
+import { useLocaleStore } from '../../stores/locale-store';
+import { FilterRuleModal } from '../filters/FilterRuleModal';
+import { SieveEditorSheet } from '../filters/SieveEditorSheet';
+import type { FilterRule } from '../../lib/sieve/types';
 
-interface Rule {
-  id: string;
-  name: string;
-  enabled: boolean;
-  summary: string;
-  action: string;
+type Translate = (key: string, fallback?: string) => string;
+
+function isReadonlyRule(r: FilterRule): boolean {
+  return r.origin === 'external' || r.origin === 'opaque';
 }
 
-const SAMPLE_RULES: Rule[] = [];
+function summarizeRule(rule: FilterRule, t: Translate): string {
+  const joiner = rule.matchType === 'all' ? t('settings.filters.and', 'and') : t('settings.filters.or', 'or');
+  const conditions = rule.conditions.slice(0, 2).map((cond) => {
+    const field = t(`settings.filters.condition_fields.${cond.field}`, cond.field);
+    const comparator = t(`settings.filters.comparators.${cond.comparator}`, cond.comparator);
+    return `${field} ${comparator} "${cond.value}"`;
+  });
+  const extra = rule.conditions.length > 2 ? ` (+${rule.conditions.length - 2})` : '';
+  const actions = rule.actions.slice(0, 2).map((a) => {
+    const action = t(`settings.filters.action_types.${a.type}`, a.type);
+    return a.value ? `${action} "${a.value}"` : action;
+  });
+  return `${conditions.join(` ${joiner} `)}${extra} → ${actions.join(', ')}`;
+}
 
 export function FilterSettings() {
   const c = useColors();
-  const styles = React.useMemo(() => makeStyles(c), [c]);
+  const styles = useMemo(() => makeStyles(c), [c]);
+  const t = useLocaleStore((s) => s.t);
+
   const hydrated = useSettingsStore((s) => s.hydrated);
   const hydrate = useSettingsStore((s) => s.hydrate);
   const expandedView = useSettingsStore((s) => s.filtersExpandedView);
-  const update = useSettingsStore((s) => s.updateSetting);
-  const [rules, setRules] = useState<Rule[]>(SAMPLE_RULES);
-  const [isOpaque] = useState(false);
-  const [deleteId, setDeleteId] = useState<string | null>(null);
+  const updateSetting = useSettingsStore((s) => s.updateSetting);
+
+  const mailboxes = useEmailStore((s) => s.mailboxes);
+  const vacationEnabled = useVacationStore((s) => s.isEnabled);
+
+  const {
+    rules, isLoading, isSaving, error, isSupported, isOpaque, rawScript, vacationSettings,
+    fetchFilters, saveFilters, addRule, updateRule, deleteRule, reorderRules, toggleRule,
+    setOpaqueScript, resetToVisualBuilder, validateScript,
+  } = useFilterStore();
+
+  const [editingRule, setEditingRule] = useState<FilterRule | undefined>();
+  const [showRuleModal, setShowRuleModal] = useState(false);
+  const [showSieveEditor, setShowSieveEditor] = useState(false);
+  const [showResetConfirm, setShowResetConfirm] = useState(false);
 
   useEffect(() => {
     if (!hydrated) void hydrate();
   }, [hydrated, hydrate]);
 
-  const toggle = (id: string) => {
-    setRules((rs) => rs.map((r) => r.id === id ? { ...r, enabled: !r.enabled } : r));
-  };
+  useEffect(() => {
+    void fetchFilters();
+  }, [fetchFilters]);
 
-  const remove = (id: string) => {
-    setRules((rs) => rs.filter((r) => r.id !== id));
-    setDeleteId(null);
-  };
+  const showVacationBanner = (vacationEnabled || vacationSettings?.isEnabled) ?? false;
+
+  // Editable (Bulwark-managed) rules, in order, for reorder math.
+  const editableIds = useMemo(
+    () => rules.filter((r) => !isReadonlyRule(r)).map((r) => r.id),
+    [rules],
+  );
+
+  const persist = useCallback(async (rollback: () => void) => {
+    try {
+      await saveFilters();
+    } catch {
+      rollback();
+      Alert.alert(t('settings.filters.save_failed', 'Failed to save filters'));
+    }
+  }, [saveFilters, t]);
+
+  const handleToggle = useCallback((ruleId: string) => {
+    toggleRule(ruleId);
+    void persist(() => toggleRule(ruleId));
+  }, [toggleRule, persist]);
+
+  const handleDelete = useCallback((rule: FilterRule) => {
+    Alert.alert(
+      t('settings.filters.delete_rule', 'Delete Rule'),
+      t('settings.filters.delete_confirm', 'Are you sure you want to delete this rule?'),
+      [
+        { text: t('settings.filters.cancel', 'Cancel'), style: 'cancel' },
+        {
+          text: t('settings.filters.confirm_delete', 'Delete'),
+          style: 'destructive',
+          onPress: () => {
+            deleteRule(rule.id);
+            void persist(() => addRule(rule));
+          },
+        },
+      ],
+    );
+  }, [deleteRule, addRule, persist, t]);
+
+  const handleSaveRule = useCallback((rule: FilterRule) => {
+    const previous = useFilterStore.getState().rules;
+    if (editingRule) updateRule(rule.id, rule);
+    else addRule(rule);
+    setShowRuleModal(false);
+    setEditingRule(undefined);
+    void persist(() => useFilterStore.setState({ rules: previous }));
+  }, [editingRule, updateRule, addRule, persist]);
+
+  const handleSaveSieve = useCallback((content: string) => {
+    const previous = useFilterStore.getState();
+    setOpaqueScript(content);
+    setShowSieveEditor(false);
+    void persist(() => useFilterStore.setState({
+      isOpaque: previous.isOpaque,
+      rules: previous.rules,
+      rawScript: previous.rawScript,
+    }));
+  }, [setOpaqueScript, persist]);
+
+  const handleResetToVisual = useCallback(() => {
+    if (!showResetConfirm) {
+      setShowResetConfirm(true);
+      return;
+    }
+    const previous = useFilterStore.getState();
+    resetToVisualBuilder();
+    setShowResetConfirm(false);
+    void persist(() => useFilterStore.setState({
+      isOpaque: previous.isOpaque,
+      rules: previous.rules,
+      rawScript: previous.rawScript,
+      externalRequires: previous.externalRequires,
+    }));
+  }, [showResetConfirm, resetToVisualBuilder, persist]);
+
+  const moveRule = useCallback((ruleId: string, dir: -1 | 1) => {
+    const idx = editableIds.indexOf(ruleId);
+    const target = idx + dir;
+    if (idx === -1 || target < 0 || target >= editableIds.length) return;
+    const previousOrder = [...editableIds];
+    const next = [...editableIds];
+    [next[idx], next[target]] = [next[target], next[idx]];
+    reorderRules(next);
+    void persist(() => reorderRules(previousOrder));
+  }, [editableIds, reorderRules, persist]);
+
+  const handleValidate = useCallback(
+    (content: string) => validateScript(content),
+    [validateScript],
+  );
+
+  // ── Status screens ──────────────────────────────────────
+  if (!isSupported && !isLoading) {
+    return (
+      <SettingsSection title={t('settings.filters.title', 'Email Filters')} description={t('settings.filters.description', 'Create rules to automatically sort, label, and manage incoming emails')}>
+        <Text style={styles.statusText}>{t('settings.filters.not_supported', 'Your mail server does not support email filters.')}</Text>
+      </SettingsSection>
+    );
+  }
+
+  if (isLoading) {
+    return (
+      <SettingsSection title={t('settings.filters.title', 'Email Filters')} description={t('settings.filters.description', 'Create rules to automatically sort, label, and manage incoming emails')}>
+        <View style={styles.loadingRow}>
+          <ActivityIndicator size="small" color={c.mutedForeground} />
+          <Text style={styles.statusText}>{t('settings.filters.loading', 'Loading filters...')}</Text>
+        </View>
+      </SettingsSection>
+    );
+  }
+
+  if (error) {
+    return (
+      <SettingsSection title={t('settings.filters.title', 'Email Filters')} description={t('settings.filters.description', 'Create rules to automatically sort, label, and manage incoming emails')}>
+        <Text style={[styles.statusText, { color: c.error }]}>{t('settings.filters.fetch_error', 'Failed to load filters')}</Text>
+      </SettingsSection>
+    );
+  }
 
   return (
-    <View style={styles.container}>
-      <SettingsSection title="Filters & Rules" description="Server-side rules that process incoming mail.">
+    <View style={{ gap: spacing.xl }}>
+      <SettingsSection title={t('settings.filters.title', 'Email Filters')} description={t('settings.filters.description', 'Create rules to automatically sort, label, and manage incoming emails')}>
         {isOpaque && (
-          <View style={styles.opaqueWarning}>
-            <AlertTriangle size={16} color="#fbbf24" />
+          <View style={styles.opaqueBanner}>
+            <AlertTriangle size={16} color={c.warning} />
             <View style={{ flex: 1 }}>
               <Text style={styles.opaqueText}>
-                Your Sieve script contains advanced features. Edit raw or reset to visual builder.
+                {t('settings.filters.opaque_warning', 'This script was edited outside the visual builder. Only raw Sieve editing is available.')}
               </Text>
               <View style={styles.opaqueActions}>
-                <Pressable>
-                  <Text style={styles.linkText}>Open Sieve Editor</Text>
-                </Pressable>
-                <Pressable style={styles.resetLink}>
-                  <RotateCcw size={12} color={c.error} />
-                  <Text style={styles.resetText}>Reset to visual</Text>
+                <Pressable onPress={() => setShowSieveEditor(true)}>
+                  <Text style={styles.linkPrimary}>{t('settings.filters.open_sieve_editor', 'Open raw Sieve editor')}</Text>
                 </Pressable>
+                {showResetConfirm ? (
+                  <View style={styles.resetConfirmRow}>
+                    <Pressable onPress={handleResetToVisual}>
+                      <Text style={styles.linkDanger}>{t('settings.filters.confirm_reset', 'Reset')}</Text>
+                    </Pressable>
+                    <Pressable onPress={() => setShowResetConfirm(false)}>
+                      <Text style={styles.linkMuted}>{t('settings.filters.cancel', 'Cancel')}</Text>
+                    </Pressable>
+                  </View>
+                ) : (
+                  <Pressable onPress={handleResetToVisual} style={styles.resetLink}>
+                    <RotateCcw size={12} color={c.error} />
+                    <Text style={styles.linkDanger}>{t('settings.filters.reset_to_visual', 'Reset to visual builder')}</Text>
+                  </Pressable>
+                )}
               </View>
             </View>
           </View>
         )}
 
-        {rules.length === 0 && !isOpaque && (
-          <View style={styles.emptyState}>
-            <Filter size={40} color={c.mutedForeground} style={{ opacity: 0.4 }} />
-            <Text style={styles.emptyText}>No rules yet.</Text>
+        {!isOpaque && showVacationBanner && (
+          <View style={styles.vacationBanner}>
+            <View style={styles.vacationIcon}>
+              <Palmtree size={16} color={c.success} />
+            </View>
+            <View style={{ flex: 1 }}>
+              <Text style={styles.vacationTitle}>{t('settings.filters.vacation_active', 'Vacation Responder is active')}</Text>
+              <Text style={styles.vacationDesc}>{t('settings.filters.vacation_active_description', 'Auto-reply is enabled for incoming messages')}</Text>
+            </View>
           </View>
         )}
 
-        {rules.length > 0 && (
-          <View style={{ gap: 4 }}>
-            {rules.map((rule) => (
-              <View key={rule.id} style={[styles.ruleRow, !rule.enabled && styles.ruleDisabled]}>
-                <View style={styles.grip}>
-                  <GripVertical size={16} color={c.mutedForeground} />
-                </View>
+        {!isOpaque && rules.length === 0 && !showVacationBanner && (
+          <View style={styles.emptyState}>
+            <Filter size={40} color={c.mutedForeground} style={{ opacity: 0.4 }} />
+            <Text style={styles.emptyText}>{t('settings.filters.no_rules', 'No filter rules')}</Text>
+          </View>
+        )}
 
-                <ToggleSwitch checked={rule.enabled} onChange={() => toggle(rule.id)} />
+        {!isOpaque && rules.length > 0 && (
+          <View style={{ gap: spacing.sm }}>
+            {rules.map((rule) => {
+              const readonly = isReadonlyRule(rule);
+              const editIdx = editableIds.indexOf(rule.id);
 
-                <View style={{ flex: 1 }}>
-                  <Text style={styles.ruleName}>{rule.name}</Text>
-                  <Text style={styles.ruleSummary} numberOfLines={expandedView ? 0 : 1}>
-                    {rule.summary} → {rule.action}
-                  </Text>
-                </View>
-
-                {deleteId === rule.id ? (
-                  <View style={{ flexDirection: 'row', gap: 4 }}>
-                    <Button variant="destructive" size="sm" onPress={() => remove(rule.id)}>
-                      Confirm
-                    </Button>
-                    <Button variant="ghost" size="sm" onPress={() => setDeleteId(null)}>
-                      Cancel
-                    </Button>
+              if (readonly) {
+                const label = rule.originLabel || t('settings.filters.origin_external', 'External');
+                const hasStructured = rule.origin === 'external' && rule.conditions.length > 0 && rule.actions.length > 0;
+                return (
+                  <View key={rule.id} style={styles.ruleRow}>
+                    <Lock size={16} color={c.mutedForeground} style={{ marginTop: 2 }} />
+                    <View style={{ flex: 1, minWidth: 0 }}>
+                      <View style={styles.ruleNameRow}>
+                        <Text style={styles.ruleName} numberOfLines={1}>{rule.name}</Text>
+                        <View style={styles.originBadge}><Text style={styles.originBadgeText}>{label}</Text></View>
+                      </View>
+                      {hasStructured ? (
+                        <Text style={styles.ruleSummary} numberOfLines={expandedView ? undefined : 2}>
+                          {summarizeRule(rule, t)}
+                        </Text>
+                      ) : rule.rawBlock ? (
+                        <Text style={styles.rawBlock} numberOfLines={expandedView ? undefined : 4}>
+                          {rule.rawBlock.trim()}
+                        </Text>
+                      ) : null}
+                    </View>
                   </View>
-                ) : (
-                  <Pressable style={styles.iconBtn} onPress={() => setDeleteId(rule.id)}>
+                );
+              }
+
+              return (
+                <View key={rule.id} style={[styles.ruleRow, !rule.enabled && styles.ruleDisabled]}>
+                  <View style={{ paddingTop: 2 }}>
+                    <ToggleSwitch checked={rule.enabled} onChange={() => handleToggle(rule.id)} />
+                  </View>
+
+                  <Pressable
+                    style={{ flex: 1, minWidth: 0 }}
+                    onPress={() => { setEditingRule(rule); setShowRuleModal(true); }}
+                  >
+                    <Text style={styles.ruleName} numberOfLines={1}>{rule.name}</Text>
+                    <Text style={styles.ruleSummary} numberOfLines={expandedView ? undefined : 2}>
+                      {summarizeRule(rule, t)}
+                    </Text>
+                  </Pressable>
+
+                  <View style={styles.reorderCol}>
+                    <Pressable
+                      onPress={() => moveRule(rule.id, -1)}
+                      disabled={editIdx <= 0}
+                      hitSlop={6}
+                      style={[styles.reorderBtn, editIdx <= 0 && styles.reorderBtnDisabled]}
+                    >
+                      <ChevronUp size={16} color={c.mutedForeground} />
+                    </Pressable>
+                    <Pressable
+                      onPress={() => moveRule(rule.id, 1)}
+                      disabled={editIdx === editableIds.length - 1}
+                      hitSlop={6}
+                      style={[styles.reorderBtn, editIdx === editableIds.length - 1 && styles.reorderBtnDisabled]}
+                    >
+                      <ChevronDown size={16} color={c.mutedForeground} />
+                    </Pressable>
+                  </View>
+
+                  <Pressable onPress={() => handleDelete(rule)} hitSlop={6} style={styles.deleteBtn}>
                     <X size={16} color={c.mutedForeground} />
                   </Pressable>
-                )}
-              </View>
-            ))}
+                </View>
+              );
+            })}
           </View>
         )}
       </SettingsSection>
 
       <View style={styles.footer}>
-        <View style={{ flexDirection: 'row', gap: spacing.sm }}>
+        <View style={styles.footerBtns}>
           {!isOpaque && (
-            <Button variant="outline" size="sm" icon={<Plus size={14} color={c.text} />}>
-              Add Rule
+            <Button
+              variant="outline"
+              size="sm"
+              icon={<Plus size={14} color={c.text} />}
+              onPress={() => { setEditingRule(undefined); setShowRuleModal(true); }}
+            >
+              {t('settings.filters.add_rule', 'Add Rule')}
             </Button>
           )}
-          <Button variant="outline" size="sm" icon={<Code size={14} color={c.text} />}>
-            Raw Editor
+          <Button
+            variant="outline"
+            size="sm"
+            icon={<Code size={14} color={c.text} />}
+            onPress={() => setShowSieveEditor(true)}
+          >
+            {t('settings.filters.raw_editor', 'Raw Sieve Editor')}
           </Button>
         </View>
 
-        {!isOpaque && rules.length > 0 && (
-          <View style={styles.expandedToggle}>
-            <Text style={styles.expandedLabel}>Expanded view</Text>
-            <ToggleSwitch checked={expandedView} onChange={(v) => update('filtersExpandedView', v)} />
-          </View>
-        )}
+        <View style={styles.footerRight}>
+          {isSaving && <ActivityIndicator size="small" color={c.mutedForeground} />}
+          {!isOpaque && rules.length > 0 && (
+            <View style={styles.expandedToggle}>
+              <Text style={styles.expandedLabel}>{t('settings.filters.expanded_view', 'Expanded view')}</Text>
+              <ToggleSwitch checked={expandedView} onChange={(v) => updateSetting('filtersExpandedView', v)} />
+            </View>
+          )}
+        </View>
       </View>
+
+      <FilterRuleModal
+        visible={showRuleModal}
+        rule={editingRule}
+        mailboxes={mailboxes}
+        onSave={handleSaveRule}
+        onClose={() => { setShowRuleModal(false); setEditingRule(undefined); }}
+      />
+
+      <SieveEditorSheet
+        visible={showSieveEditor}
+        content={rawScript}
+        onSave={handleSaveSieve}
+        onClose={() => setShowSieveEditor(false)}
+        onValidate={handleValidate}
+      />
     </View>
   );
 }
 
 function makeStyles(c: ThemePalette) {
   return StyleSheet.create({
-  container: { gap: spacing.xl },
-  opaqueWarning: {
-    flexDirection: 'row',
-    gap: spacing.sm,
-    padding: spacing.md,
-    borderRadius: radius.sm,
-    borderWidth: 1,
-    borderColor: 'rgba(252, 211, 77, 0.4)',
-    backgroundColor: 'rgba(120, 53, 15, 0.25)',
-    alignItems: 'flex-start',
-  },
-  opaqueText: { ...typography.caption, color: '#fde68a' },
-  opaqueActions: { flexDirection: 'row', gap: spacing.md, marginTop: spacing.sm },
-  linkText: { ...typography.caption, color: c.primary, fontWeight: '500' },
-  resetLink: { flexDirection: 'row', alignItems: 'center', gap: 4 },
-  resetText: { ...typography.caption, color: c.error, fontWeight: '500' },
-  emptyState: { alignItems: 'center', paddingVertical: spacing.xxl, gap: spacing.md },
-  emptyText: { ...typography.body, color: c.mutedForeground },
-  ruleRow: {
-    flexDirection: 'row',
-    alignItems: 'flex-start',
-    gap: spacing.md,
-    padding: spacing.md,
-    borderRadius: radius.sm,
-    borderWidth: 1,
-    borderColor: c.border,
-  },
-  ruleDisabled: { opacity: 0.6 },
-  grip: { paddingTop: 2 },
-  ruleName: { ...typography.bodyMedium, color: c.text },
-  ruleSummary: { ...typography.caption, color: c.mutedForeground, marginTop: 2 },
-  iconBtn: {
-    width: 28,
-    height: 28,
-    alignItems: 'center',
-    justifyContent: 'center',
-    borderRadius: radius.sm,
-  },
-  footer: {
-    flexDirection: 'row',
-    alignItems: 'center',
-    justifyContent: 'space-between',
-    gap: spacing.md,
-    flexWrap: 'wrap',
-  },
-  expandedToggle: { flexDirection: 'row', alignItems: 'center', gap: spacing.sm },
-  expandedLabel: { ...typography.caption, color: c.mutedForeground },
-});
+    statusText: { ...typography.body, color: c.mutedForeground, paddingVertical: spacing.md },
+    loadingRow: { flexDirection: 'row', alignItems: 'center', gap: spacing.sm, paddingVertical: spacing.md },
+
+    opaqueBanner: {
+      flexDirection: 'row',
+      gap: spacing.sm,
+      padding: spacing.md,
+      borderRadius: radius.sm,
+      borderWidth: 1,
+      borderColor: 'rgba(252, 211, 77, 0.4)',
+      backgroundColor: 'rgba(120, 53, 15, 0.25)',
+      alignItems: 'flex-start',
+    },
+    opaqueText: { ...typography.caption, color: '#fde68a' },
+    opaqueActions: { flexDirection: 'row', gap: spacing.lg, marginTop: spacing.sm, flexWrap: 'wrap', alignItems: 'center' },
+    resetConfirmRow: { flexDirection: 'row', gap: spacing.md, alignItems: 'center' },
+    resetLink: { flexDirection: 'row', alignItems: 'center', gap: 4 },
+    linkPrimary: { ...typography.caption, color: c.primary, fontWeight: '500' },
+    linkDanger: { ...typography.caption, color: c.error, fontWeight: '500' },
+    linkMuted: { ...typography.caption, color: c.mutedForeground },
+
+    vacationBanner: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      gap: spacing.md,
+      padding: spacing.md,
+      borderRadius: radius.md,
+      borderWidth: 1,
+      borderColor: c.success,
+      backgroundColor: c.successBg,
+    },
+    vacationIcon: {
+      width: 32, height: 32, borderRadius: radius.full,
+      alignItems: 'center', justifyContent: 'center',
+      backgroundColor: 'rgba(34,197,94,0.15)',
+    },
+    vacationTitle: { ...typography.bodyMedium, color: c.success },
+    vacationDesc: { ...typography.caption, color: c.mutedForeground, marginTop: 2 },
+
+    emptyState: { alignItems: 'center', paddingVertical: spacing.xxl, gap: spacing.md },
+    emptyText: { ...typography.body, color: c.mutedForeground },
+
+    ruleRow: {
+      flexDirection: 'row',
+      alignItems: 'flex-start',
+      gap: spacing.md,
+      padding: spacing.md,
+      borderRadius: radius.md,
+      borderWidth: 1,
+      borderColor: c.border,
+    },
+    ruleDisabled: { opacity: 0.6 },
+    ruleNameRow: { flexDirection: 'row', alignItems: 'center', gap: spacing.sm, flexWrap: 'wrap' },
+    ruleName: { ...typography.bodyMedium, color: c.text, flexShrink: 1 },
+    ruleSummary: { ...typography.caption, color: c.mutedForeground, marginTop: 2 },
+    rawBlock: {
+      ...typography.caption,
+      color: c.mutedForeground,
+      fontFamily: 'monospace',
+      marginTop: spacing.sm,
+      padding: spacing.sm,
+      backgroundColor: c.muted,
+      borderRadius: radius.xs,
+    },
+    originBadge: { paddingHorizontal: 6, paddingVertical: 2, borderRadius: radius.full, backgroundColor: c.muted },
+    originBadgeText: { fontSize: 10, fontWeight: '500', color: c.mutedForeground },
+
+    reorderCol: { alignItems: 'center' },
+    reorderBtn: { padding: 2 },
+    reorderBtnDisabled: { opacity: 0.25 },
+    deleteBtn: {
+      width: 28, height: 28,
+      alignItems: 'center', justifyContent: 'center',
+      borderRadius: radius.sm,
+    },
+
+    footer: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      justifyContent: 'space-between',
+      gap: spacing.md,
+      flexWrap: 'wrap',
+    },
+    footerBtns: { flexDirection: 'row', gap: spacing.sm, flexWrap: 'wrap' },
+    footerRight: { flexDirection: 'row', alignItems: 'center', gap: spacing.md },
+    expandedToggle: { flexDirection: 'row', alignItems: 'center', gap: spacing.sm },
+    expandedLabel: { ...typography.caption, color: c.mutedForeground },
+  });
 }

src/components/settings/LanguageSettings.tsx

@@ -1,10 +1,12 @@
 import React, { useEffect } from 'react';
 import { View, Text, StyleSheet, Pressable } from 'react-native';
 import { Check } from 'lucide-react-native';
-import { SettingsSection, SettingItem } from './settings-section';
+import { SettingsSection, SettingItem, RadioGroup } from './settings-section';
 import { spacing, radius, typography, type ThemePalette } from '../../theme/tokens';
 import { useColors } from '../../theme/colors';
 import { useLocaleStore } from '../../stores/locale-store';
+import { useSettingsStore, type DateFormat, type TimeFormat } from '../../stores/settings-store';
+import { formatListDate } from '../../lib/date-format';
 import { SUPPORTED_LOCALES, detectDeviceLocale, type LocaleCode } from '../../i18n';
 
 export function LanguageSettings() {
@@ -12,15 +14,30 @@ export function LanguageSettings() {
   const styles = React.useMemo(() => makeStyles(c), [c]);
   const override = useLocaleStore((s) => s.override);
   const setOverride = useLocaleStore((s) => s.setOverride);
+  const locale = useLocaleStore((s) => s.locale);
   const hydrated = useLocaleStore((s) => s.hydrated);
   const hydrate = useLocaleStore((s) => s.hydrate);
   const t = useLocaleStore((s) => s.t);
 
+  const settingsHydrated = useSettingsStore((s) => s.hydrated);
+  const hydrateSettings = useSettingsStore((s) => s.hydrate);
+  const dateFormat = useSettingsStore((s) => s.dateFormat);
+  const timeFormat = useSettingsStore((s) => s.timeFormat);
+  const update = useSettingsStore((s) => s.updateSetting);
+
   useEffect(() => { if (!hydrated) void hydrate(); }, [hydrated, hydrate]);
+  useEffect(() => { if (!settingsHydrated) void hydrateSettings(); }, [settingsHydrated, hydrateSettings]);
 
   const deviceCode = detectDeviceLocale();
   const selected: LocaleCode | 'system' = override ?? 'system';
 
+  // Build live preview samples so the user sees what each format looks like.
+  const now = new Date();
+  const fmtOpts = { dateFormat, timeFormat, locale };
+  const previewToday = formatListDate(now, fmtOpts);
+  const previewWeek = formatListDate(new Date(now.getTime() - 3 * 86400000), fmtOpts);
+  const previewOlder = formatListDate(new Date(now.getTime() - 40 * 86400000), fmtOpts);
+
   const renderRow = (code: LocaleCode | 'system', label: string, sublabel?: string) => {
     const active = selected === code;
     return (
@@ -42,21 +59,61 @@ export function LanguageSettings() {
     SUPPORTED_LOCALES.find((l) => l.code === deviceCode)?.label ?? 'English';
 
   return (
-    <SettingsSection
-      title={t('settings.appearance.language.label', 'Language')}
-      description={t('settings.appearance.language.description', 'Choose your preferred language')}
-    >
-      <SettingItem
-        label={t('settings.appearance.language.label', 'Language')}
+    <View style={{ gap: spacing.xxxl }}>
+      <SettingsSection
+        title={t('settings.appearance.language.label', 'Language')}
         description={t('settings.appearance.language.description', 'Choose your preferred language')}
-        noBorder
-      />
-      <View style={styles.list}>
-        {renderRow('system', `System default (${deviceLabel})`)}
-        <View style={styles.divider} />
-        {SUPPORTED_LOCALES.map((l) => renderRow(l.code, l.label))}
-      </View>
-    </SettingsSection>
+      >
+        <View style={styles.list}>
+          {renderRow('system', `System default (${deviceLabel})`)}
+          <View style={styles.divider} />
+          {SUPPORTED_LOCALES.map((l) => renderRow(l.code, l.label))}
+        </View>
+      </SettingsSection>
+
+      <SettingsSection
+        title={t('settings.language_region.date_format.label', 'Date Format')}
+        description={t('settings.language_region.date_format.description', 'How dates are shown in the email list')}
+      >
+        <RadioGroup
+          value={dateFormat}
+          onChange={(v) => update('dateFormat', v as DateFormat)}
+          options={[
+            { value: 'smart', label: t('settings.language_region.date_format.smart', 'Smart (locale-aware)') },
+            { value: 'relative', label: t('settings.language_region.date_format.relative', 'Relative (1h ago, 2d ago)') },
+            { value: 'full', label: t('settings.language_region.date_format.full', 'Always full date') },
+          ]}
+        />
+        <View style={styles.previewBox}>
+          <View style={styles.previewRow}>
+            <Text style={styles.previewLabel}>{t('settings.language_region.date_format.preview_today', 'Today:')}</Text>
+            <Text style={styles.previewValue}>{previewToday}</Text>
+          </View>
+          <View style={styles.previewRow}>
+            <Text style={styles.previewLabel}>{t('settings.language_region.date_format.preview_this_week', 'This week:')}</Text>
+            <Text style={styles.previewValue}>{previewWeek}</Text>
+          </View>
+          <View style={styles.previewRow}>
+            <Text style={styles.previewLabel}>{t('settings.language_region.date_format.preview_older', 'Older:')}</Text>
+            <Text style={styles.previewValue}>{previewOlder}</Text>
+          </View>
+        </View>
+      </SettingsSection>
+
+      <SettingsSection
+        title={t('settings.language_region.time_format.label', 'Time Format')}
+        description={t('settings.language_region.time_format.description', 'Choose between 12-hour or 24-hour clock')}
+      >
+        <RadioGroup
+          value={timeFormat}
+          onChange={(v) => update('timeFormat', v as TimeFormat)}
+          options={[
+            { value: '24h', label: t('settings.language_region.time_format.24h', '24-hour') },
+            { value: '12h', label: t('settings.language_region.time_format.12h', '12-hour') },
+          ]}
+        />
+      </SettingsSection>
+    </View>
   );
 }
 
@@ -74,5 +131,15 @@ function makeStyles(c: ThemePalette) {
   divider: { height: 1, backgroundColor: c.border, marginHorizontal: spacing.md },
   label: { ...typography.body, color: c.text },
   sublabel: { ...typography.caption, color: c.textMuted, marginTop: 2 },
+  previewBox: {
+    marginTop: spacing.md,
+    padding: spacing.md,
+    borderRadius: radius.md,
+    backgroundColor: c.muted,
+    gap: 4,
+  },
+  previewRow: { flexDirection: 'row', justifyContent: 'space-between', gap: spacing.md },
+  previewLabel: { ...typography.caption, color: c.mutedForeground },
+  previewValue: { ...typography.captionMedium, color: c.text },
 });
 }

src/components/settings/LayoutSettings.tsx

@@ -1,10 +1,18 @@
 import React, { useEffect } from 'react';
 import { View, Text, StyleSheet } from 'react-native';
-import { ArrowRight, ArrowLeft } from 'lucide-react-native';
-import { SettingsSection, RadioGroup } from './settings-section';
+import { ArrowRight, ArrowLeft, MoveVertical } from 'lucide-react-native';
+import { SettingsSection, RadioGroup, Select } from './settings-section';
 import { spacing, typography, type ThemePalette } from '../../theme/tokens';
 import { useColors } from '../../theme/colors';
-import { useSettingsStore, type SwipeAction, type SwipeMode } from '../../stores/settings-store';
+import {
+  useSettingsStore,
+  normalizeBottomQuickActions,
+  REPLY_QUICK_ACTIONS,
+  ALL_QUICK_ACTIONS,
+  type SwipeAction,
+  type SwipeMode,
+  type QuickAction,
+} from '../../stores/settings-store';
 
 const SWIPE_OPTIONS: { value: SwipeAction; label: string }[] = [
   { value: 'none',    label: 'None' },
@@ -22,6 +30,24 @@ const SWIPE_MODE_OPTIONS: { value: SwipeMode; label: string }[] = [
   { value: 'reveal',  label: 'Reveal (swipe, then tap)' },
 ];
 
+const QUICK_ACTION_LABELS: Record<QuickAction, string> = {
+  reply: 'Reply',
+  replyAll: 'Reply All',
+  forward: 'Forward',
+  delete: 'Delete',
+  archive: 'Archive',
+  markUnread: 'Mark Read/Unread',
+  star: 'Star',
+  move: 'Move to folder',
+  spam: 'Spam',
+  tag: 'Tag',
+};
+
+const QUICK_ACTION_OPTIONS = ALL_QUICK_ACTIONS.map((value) => ({
+  value,
+  label: QUICK_ACTION_LABELS[value],
+}));
+
 export function LayoutSettings() {
   const c = useColors();
   const styles = React.useMemo(() => makeStyles(c), [c]);
@@ -31,11 +57,27 @@ export function LayoutSettings() {
   const setSwipeRightAction = useSettingsStore((s) => s.setSwipeRightAction);
   const swipeMode = useSettingsStore((s) => s.swipeMode);
   const setSwipeMode = useSettingsStore((s) => s.setSwipeMode);
+  const bottomQuickActionsRaw = useSettingsStore((s) => s.bottomQuickActions);
+  const update = useSettingsStore((s) => s.updateSetting);
   const hydrated = useSettingsStore((s) => s.hydrated);
   const hydrate = useSettingsStore((s) => s.hydrate);
 
   useEffect(() => { if (!hydrated) void hydrate(); }, [hydrated, hydrate]);
 
+  const bottomActions = normalizeBottomQuickActions(bottomQuickActionsRaw);
+  // Pick an action for a bar slot. If the chosen action already occupies
+  // another slot, swap the two so the three slots stay unique.
+  const setQuickActionSlot = (index: number, value: QuickAction) => {
+    const next = [...bottomActions];
+    const existing = next.indexOf(value);
+    if (existing !== -1 && existing !== index) {
+      next[existing] = next[index];
+    }
+    next[index] = value;
+    update('bottomQuickActions', next);
+  };
+  const relocated = REPLY_QUICK_ACTIONS.filter((a) => !bottomActions.includes(a));
+
   return (
     <SettingsSection title="Layout" description="Tune the email list interactions for mobile.">
       <View style={{ gap: spacing.sm }}>
@@ -81,6 +123,34 @@ export function LayoutSettings() {
         />
       </View>
 
+      <View style={{ gap: spacing.sm, marginTop: spacing.lg }}>
+        <View style={styles.row}>
+          <MoveVertical size={14} color={c.mutedForeground} />
+          <Text style={styles.rowLabel}>Reader quick actions</Text>
+        </View>
+        <Text style={styles.rowDescription}>
+          The three buttons shown between Prev/Next at the bottom of an open
+          email. Defaults to Reply, Reply All and Forward.
+        </Text>
+        {bottomActions.map((action, index) => (
+          <View key={index} style={styles.slotRow}>
+            <Text style={styles.slotLabel}>Slot {index + 1}</Text>
+            <Select
+              value={action}
+              onChange={(v) => setQuickActionSlot(index, v as QuickAction)}
+              options={QUICK_ACTION_OPTIONS}
+            />
+          </View>
+        ))}
+        {relocated.length > 0 && (
+          <Text style={styles.rowDescription}>
+            {relocated.map((a) => QUICK_ACTION_LABELS[a]).join(', ')}
+            {relocated.length === 1 ? ' is' : ' are'} moved to the top toolbar so
+            you can still use {relocated.length === 1 ? 'it' : 'them'}.
+          </Text>
+        )}
+      </View>
+
     </SettingsSection>
   );
 }
@@ -90,5 +160,13 @@ function makeStyles(c: ThemePalette) {
   row: { flexDirection: 'row', alignItems: 'center', gap: 6 },
   rowLabel: { ...typography.bodyMedium, color: c.text },
   rowDescription: { ...typography.caption, color: c.mutedForeground },
+  slotRow: {
+    flexDirection: 'row',
+    alignItems: 'center',
+    justifyContent: 'space-between',
+    gap: spacing.md,
+    marginTop: spacing.xs,
+  },
+  slotLabel: { ...typography.body, color: c.text },
 });
 }

src/components/settings/NotificationSettings.tsx

@@ -17,9 +17,10 @@ import { useSettingsStore, type NotificationSound } from '../../stores/settings-
 import {
   DEFAULT_RELAY_BASE_URL,
   getStoredRelayBaseUrl,
+  readPushAccountIds,
   setStoredRelayBaseUrl,
   setupPushNotifications,
-  teardownPushNotifications,
+  teardownPushNotificationsForAccount,
 } from '../../lib/push-notifications';
 
 const SOUNDS: { value: NotificationSound; label: string }[] = [
@@ -40,6 +41,7 @@ export function NotificationSettings() {
   const c = useColors();
   const styles = React.useMemo(() => makeStyles(c), [c]);
   const username = useAuthStore((s) => s.username);
+  const activeAccountId = useAuthStore((s) => s.activeAccountId);
 
   const hydrated = useSettingsStore((s) => s.hydrated);
   const hydrate = useSettingsStore((s) => s.hydrate);
@@ -106,10 +108,20 @@ export function NotificationSettings() {
     setConfirmDisable(false);
     setPushStatus({ kind: 'busy', message: 'Disabling…' });
     try {
-      await teardownPushNotifications();
-      await setStoredRelayBaseUrl(null);
-      setRelayUrl(DEFAULT_RELAY_BASE_URL);
-      setHasSaved(false);
+      if (activeAccountId) {
+        await teardownPushNotificationsForAccount(activeAccountId);
+      }
+      // The relay base URL is a device-wide setting shared with any other
+      // accounts that are still using push. Only clear it (and reset the UI
+      // to "not configured") when no accounts are using push any more —
+      // otherwise the remaining accounts would lose their relay URL and
+      // their next setup attempt would no-op.
+      const remaining = await readPushAccountIds();
+      if (remaining.length === 0) {
+        await setStoredRelayBaseUrl(null);
+        setRelayUrl(DEFAULT_RELAY_BASE_URL);
+        setHasSaved(false);
+      }
       setPushStatus({ kind: 'idle' });
     } catch (error) {
       setPushStatus({

src/components/settings/ReadingSettings.tsx

@@ -83,6 +83,7 @@ export function ReadingSettings() {
   const showPreview = useSettingsStore((s) => s.showPreview);
   const mailLayout = useSettingsStore((s) => s.mailLayout);
   const disableThreading = useSettingsStore((s) => s.disableThreading);
+  const includeGroupInUnified = useSettingsStore((s) => s.includeGroupInUnified);
   const autoSelectReplyIdentity = useSettingsStore((s) => s.autoSelectReplyIdentity);
   const plainTextMode = useSettingsStore((s) => s.plainTextMode);
   const emailsPerPage = useSettingsStore((s) => s.emailsPerPage);
@@ -177,6 +178,7 @@ export function ReadingSettings() {
           onChange={(v) => update('deleteAction', v as DeleteAction)}
           options={[
             { value: 'trash', label: 'Move to Trash' },
+            { value: 'trash-and-read', label: 'Move to Trash and mark as read' },
             { value: 'permanent', label: 'Permanently delete' },
           ]}
         />
@@ -250,6 +252,10 @@ export function ReadingSettings() {
         <ToggleSwitch checked={disableThreading} onChange={(v) => update('disableThreading', v)} />
       </SettingItem>
 
+      <SettingItem label="Include Group Inboxes" description="Also show group and shared inboxes in the unified All Inboxes view.">
+        <ToggleSwitch checked={includeGroupInUnified} onChange={(v) => update('includeGroupInUnified', v)} />
+      </SettingItem>
+
       <SettingItem label="Plain Text Mode" description="Compose and read in plain text only.">
         <ToggleSwitch checked={plainTextMode} onChange={(v) => update('plainTextMode', v)} />
       </SettingItem>

src/lib/__tests__/calendar-alerts.test.ts

@@ -0,0 +1,80 @@
+import { describe, it, expect } from 'vitest';
+import {
+  offsetToMinutesBefore,
+  minutesBeforeToOffset,
+  alertsToReminders,
+  remindersToAlerts,
+  formatReminder,
+} from '../calendar-alerts';
+
+describe('calendar-alerts', () => {
+  describe('offsetToMinutesBefore', () => {
+    it('parses minute offsets', () => {
+      expect(offsetToMinutesBefore('-PT15M')).toBe(15);
+      expect(offsetToMinutesBefore('-PT30M')).toBe(30);
+    });
+    it('parses hour and day offsets', () => {
+      expect(offsetToMinutesBefore('-PT1H')).toBe(60);
+      expect(offsetToMinutesBefore('-P1D')).toBe(60 * 24);
+    });
+    it('treats PT0S as at-time (0)', () => {
+      expect(offsetToMinutesBefore('PT0S')).toBe(0);
+    });
+    it('returns negative minutesBefore for post-start offsets', () => {
+      expect(offsetToMinutesBefore('PT10M')).toBe(-10);
+    });
+    it('returns null for garbage', () => {
+      expect(offsetToMinutesBefore('nonsense')).toBeNull();
+    });
+  });
+
+  describe('minutesBeforeToOffset', () => {
+    it('round-trips through offsetToMinutesBefore', () => {
+      for (const m of [0, 5, 15, 30, 60, 120, 60 * 24, 60 * 24 * 7]) {
+        expect(offsetToMinutesBefore(minutesBeforeToOffset(m))).toBe(m);
+      }
+    });
+    it('emits PT0S at time of event', () => {
+      expect(minutesBeforeToOffset(0)).toBe('PT0S');
+    });
+  });
+
+  describe('alertsToReminders / remindersToAlerts', () => {
+    it('extracts and de-dupes reminders, sorted by lead time desc', () => {
+      const reminders = alertsToReminders({
+        a: { trigger: { '@type': 'OffsetTrigger', offset: '-PT15M' }, action: 'display' },
+        b: { trigger: { '@type': 'OffsetTrigger', offset: '-P1D' }, action: 'display' },
+        c: { trigger: { '@type': 'OffsetTrigger', offset: '-PT15M' }, action: 'display' },
+      });
+      expect(reminders).toEqual([{ minutesBefore: 60 * 24 }, { minutesBefore: 15 }]);
+    });
+
+    it('builds an alerts map from reminders', () => {
+      const alerts = remindersToAlerts([{ minutesBefore: 15 }, { minutesBefore: 0 }]);
+      expect(alerts && Object.keys(alerts)).toHaveLength(2);
+      const offsets = Object.values(alerts!).map((a) => a.trigger.offset);
+      expect(offsets).toContain('-PT15M');
+      expect(offsets).toContain('PT0S');
+    });
+
+    it('returns undefined for an empty reminder list', () => {
+      expect(remindersToAlerts([])).toBeUndefined();
+    });
+
+    it('round-trips alerts → reminders → alerts', () => {
+      const reminders = [{ minutesBefore: 60 }, { minutesBefore: 10 }];
+      const back = alertsToReminders(remindersToAlerts(reminders));
+      expect(back).toEqual([{ minutesBefore: 60 }, { minutesBefore: 10 }]);
+    });
+  });
+
+  describe('formatReminder', () => {
+    it('formats common offsets', () => {
+      expect(formatReminder(0)).toBe('At time of event');
+      expect(formatReminder(15)).toBe('15 minutes before');
+      expect(formatReminder(60)).toBe('1 hour before');
+      expect(formatReminder(60 * 24)).toBe('1 day before');
+      expect(formatReminder(60 * 24 * 7)).toBe('1 week before');
+    });
+  });
+});

src/lib/__tests__/calendar-utils.test.ts

@@ -7,6 +7,9 @@ import {
   normalizeAllDayDuration,
   buildAllDayDuration,
   getCalendarColor,
+  getEventStartDate,
+  getEventEndDate,
+  timePattern,
   layoutOverlappingEvents,
   CALENDAR_COLOR_PALETTE,
 } from '../calendar-utils';
@@ -51,6 +54,32 @@ describe('parseLocalDateTime', () => {
   });
 });
 
+describe('getEventStartDate / getEventEndDate malformed utc fallback', () => {
+  // Mirrors webmail (#316): a malformed utcStart/utcEnd must fall back to the
+  // floating `start` + duration instead of producing an Invalid Date, which
+  // would silently drop the event from the day index and every view.
+  it('falls back to start when utcStart is unparseable', () => {
+    const d = getEventStartDate(ev({ utcStart: 'garbage' }));
+    expect(isNaN(d.getTime())).toBe(false);
+    expect(d.getHours()).toBe(9);
+  });
+
+  it('falls back to start + duration when utcEnd is unparseable', () => {
+    const end = getEventEndDate(ev({ utcEnd: 'garbage', duration: 'PT1H' }));
+    expect(isNaN(end.getTime())).toBe(false);
+    const start = getEventStartDate(ev({}));
+    expect(end.getTime() - start.getTime()).toBe(60 * 60 * 1000);
+  });
+});
+
+describe('timePattern', () => {
+  it('maps 12h to an am/pm pattern and 24h (or undefined) to HH:mm', () => {
+    expect(timePattern('12h')).toBe('h:mm a');
+    expect(timePattern('24h')).toBe('HH:mm');
+    expect(timePattern(undefined)).toBe('HH:mm');
+  });
+});
+
 describe('eventTimeRange', () => {
   it('returns start, end, allDay for a timed event with utcStart/utcEnd', () => {
     const range = eventTimeRange(ev({

src/lib/__tests__/compose-html.test.ts

@@ -18,11 +18,22 @@ describe('buildInitialHtml', () => {
       receivedAt: '2026-04-27T10:00:00Z',
     });
     expect(html).toContain('<p><br></p>');
-    expect(html).toContain('Alice &lt;a@b.com&gt; wrote:');
+    // Default header labels the sender by name only (matches webmail #295).
+    expect(html).toMatch(/On .+, Alice wrote:/);
+    expect(html).not.toContain('a@b.com');
     expect(html).toContain('<blockquote');
     expect(html).toContain('line one<br>line two');
   });
 
+  it('falls back to the email address when the sender has no name', () => {
+    const html = buildInitialHtml('reply', {
+      from: { email: 'a@b.com' },
+      body: 'hi',
+      receivedAt: '2026-04-27T10:00:00Z',
+    });
+    expect(html).toContain('a@b.com wrote:');
+  });
+
   it('uses HTML body when present, stripping dangerous tags', () => {
     const html = buildInitialHtml('reply', {
       from: { email: 'x@y.com' },
@@ -41,7 +52,7 @@ describe('buildInitialHtml', () => {
       receivedAt: '2026-04-27T10:00:00Z',
     });
     expect(html).toContain('Forwarded message');
-    expect(html).toContain('From: Bob &lt;b@c.com&gt;');
+    expect(html).toContain('From: Bob');
     expect(html).toContain('Subject: Original Subject');
     expect(html).toContain('forwarded body');
   });

src/lib/__tests__/date-format.test.ts

@@ -0,0 +1,53 @@
+import { describe, it, expect, vi, afterEach } from 'vitest';
+import { formatListDate } from '../date-format';
+
+afterEach(() => {
+  vi.useRealTimers();
+});
+
+describe('formatListDate', () => {
+  it('returns empty string for an invalid date', () => {
+    expect(formatListDate('not-a-date', { dateFormat: 'smart', timeFormat: '24h', locale: 'en' })).toBe('');
+  });
+
+  it('relative: minutes / hours / days ago', () => {
+    vi.useFakeTimers();
+    vi.setSystemTime(new Date('2026-05-30T12:00:00Z'));
+    const opts = { dateFormat: 'relative' as const, timeFormat: '24h' as const, locale: 'en' };
+    expect(formatListDate(new Date(Date.now() - 5 * 60000), opts)).toBe('5m ago');
+    expect(formatListDate(new Date(Date.now() - 3 * 3600000), opts)).toBe('3h ago');
+    expect(formatListDate(new Date(Date.now() - 2 * 86400000), opts)).toBe('2d ago');
+  });
+
+  it('relative: "Just now" under a minute', () => {
+    vi.useFakeTimers();
+    vi.setSystemTime(new Date('2026-05-30T12:00:00Z'));
+    expect(
+      formatListDate(new Date(Date.now() - 10_000), { dateFormat: 'relative', timeFormat: '24h', locale: 'en' }),
+    ).toBe('Just now');
+  });
+
+  it('smart: same-day shows time only (24h, no AM/PM)', () => {
+    vi.useFakeTimers();
+    vi.setSystemTime(new Date('2026-05-30T12:00:00Z'));
+    const out = formatListDate(new Date(), { dateFormat: 'smart', timeFormat: '24h', locale: 'en' });
+    expect(out).not.toMatch(/AM|PM/);
+    expect(out).toMatch(/^\d{1,2}:\d{2}$/);
+  });
+
+  it('smart: older than a week shows a numeric date', () => {
+    vi.useFakeTimers();
+    vi.setSystemTime(new Date('2026-05-30T12:00:00Z'));
+    const out = formatListDate(new Date('2026-01-01T09:00:00Z'), {
+      dateFormat: 'smart',
+      timeFormat: '24h',
+      locale: 'en',
+    });
+    expect(out).toContain('2026');
+  });
+
+  it('full: always includes the year', () => {
+    const out = formatListDate('2026-04-28T15:31:00Z', { dateFormat: 'full', timeFormat: '24h', locale: 'en' });
+    expect(out).toContain('2026');
+  });
+});

src/lib/__tests__/download-filename.test.ts

@@ -0,0 +1,63 @@
+import { describe, it, expect } from 'vitest';
+import {
+  emailExportFilename,
+  attachmentDownloadFilename,
+  buildSampleEmail,
+  DEFAULT_EMAIL_TEMPLATE,
+} from '../download-filename';
+
+const SAMPLE = buildSampleEmail();
+
+describe('emailExportFilename', () => {
+  it('renders the default template and appends .eml', () => {
+    const name = emailExportFilename(SAMPLE, DEFAULT_EMAIL_TEMPLATE);
+    expect(name.endsWith('.eml')).toBe(true);
+    expect(name).toContain('2026-05-22');
+    expect(name).toContain('Alice');
+    expect(name).toContain('Bob');
+  });
+
+  it('falls back to "email.eml" when the template renders empty', () => {
+    expect(emailExportFilename(SAMPLE, '')).toBe('email.eml');
+  });
+
+  it('applies the lowercase + underscore transforms', () => {
+    const name = emailExportFilename(SAMPLE, {
+      template: '{from} {subject}',
+      lowercase: true,
+      spaceReplacement: 'underscore',
+    });
+    expect(name).toBe(name.toLowerCase());
+    expect(name).not.toContain(' ');
+  });
+
+  it('strips diacritics when requested', () => {
+    const name = emailExportFilename(SAMPLE, {
+      template: '{subject}',
+      stripDiacritics: true,
+    });
+    // "Gerät" → "Gerat"
+    expect(name).toContain('Gerat');
+    expect(name).not.toContain('ä');
+  });
+});
+
+describe('attachmentDownloadFilename', () => {
+  const attachment = { name: 'Rechnung 2026.pdf', type: 'application/pdf' };
+
+  it('keeps the original name with the {filename} template', () => {
+    const name = attachmentDownloadFilename(SAMPLE, attachment, '{filename}');
+    expect(name).toBe('Rechnung 2026.pdf');
+  });
+
+  it('re-appends the extension when the template omits it', () => {
+    const name = attachmentDownloadFilename(SAMPLE, attachment, '{date_short} {name}');
+    expect(name.endsWith('.pdf')).toBe(true);
+    expect(name).toContain('2026-05-22');
+  });
+
+  it('falls back to the raw name when no email is provided', () => {
+    const name = attachmentDownloadFilename(null, attachment);
+    expect(name).toBe('Rechnung 2026.pdf');
+  });
+});

src/lib/__tests__/recurrence-expansion.test.ts

@@ -174,3 +174,77 @@ describe('expandRecurringEvents - range filtering', () => {
     ]);
   });
 });
+
+describe('expandRecurringEvents - excludedRecurrenceRules', () => {
+  it('removes occurrences generated by excluded rules', () => {
+    const event = ev({
+      start: '2025-01-06T09:00:00',
+      recurrenceRules: [{ frequency: 'daily' }],
+      excludedRecurrenceRules: [{
+        frequency: 'weekly',
+        byDay: [{ day: 'tu' }],
+      }],
+    });
+    // Jan 6-12 2025: Mon-Sun, Tuesday Jan 7 excluded
+    const result = expandRecurringEvents([event], '2025-01-06T00:00:00', '2025-01-13T00:00:00');
+    const days = result.map((e) => e.start.substring(0, 10));
+    expect(days).not.toContain('2025-01-07');
+    expect(days).toContain('2025-01-06');
+    expect(days).toContain('2025-01-08');
+    expect(result).toHaveLength(6);
+  });
+});
+
+describe('expandRecurringEvents - long-running series', () => {
+  it('expands a daily series started years before the visible range', () => {
+    const event = ev({
+      start: '2022-01-03T09:00:00',
+      recurrenceRules: [{ frequency: 'daily' }],
+    });
+    const result = expandRecurringEvents([event], '2025-06-02T00:00:00', '2025-06-05T00:00:00');
+    expect(result.map((e) => e.start)).toEqual([
+      '2025-06-02T09:00:00',
+      '2025-06-03T09:00:00',
+      '2025-06-04T09:00:00',
+    ]);
+  });
+
+  it('expands a weekly series started years before the visible range', () => {
+    const event = ev({
+      start: '2020-01-06T09:00:00', // Monday
+      recurrenceRules: [{ frequency: 'weekly' }],
+    });
+    const result = expandRecurringEvents([event], '2025-06-01T00:00:00', '2025-06-30T00:00:00');
+    const days = result.map((e) => e.start.substring(0, 10));
+    expect(days).toEqual(['2025-06-02', '2025-06-09', '2025-06-16', '2025-06-23']);
+  });
+
+  it('still respects count for old series (no fast-forward shortcut)', () => {
+    const event = ev({
+      start: '2025-01-06T09:00:00',
+      recurrenceRules: [{ frequency: 'daily', count: 5 }],
+    });
+    // Range far after the 5 occurrences ran out
+    const result = expandRecurringEvents([event], '2025-06-01T00:00:00', '2025-06-30T00:00:00');
+    expect(result).toHaveLength(0);
+  });
+});
+
+describe('expandRecurringEvents - event timezone DST handling', () => {
+  it('keeps wall time across a DST transition in the event timezone', () => {
+    // America/New_York: EST (UTC-5) until 2025-03-09, EDT (UTC-4) after
+    const event = ev({
+      start: '2025-03-03T10:00:00',
+      timeZone: 'America/New_York',
+      utcStart: '2025-03-03T15:00:00Z',
+      utcEnd: '2025-03-03T16:00:00Z',
+      recurrenceRules: [{ frequency: 'weekly' }],
+    });
+    const result = expandRecurringEvents([event], '2025-03-03T00:00:00', '2025-03-17T00:00:00');
+    const utcStarts = result.map((e) => e.utcStart);
+    expect(utcStarts[0]).toBe('2025-03-03T15:00:00.000Z'); // EST: 10:00 -5
+    expect(utcStarts[1]).toBe('2025-03-10T14:00:00.000Z'); // EDT: 10:00 -4
+    const utcEnds = result.map((e) => e.utcEnd);
+    expect(utcEnds[1]).toBe('2025-03-10T15:00:00.000Z');
+  });
+});

src/lib/__tests__/vcard.test.ts

@@ -0,0 +1,122 @@
+import { describe, it, expect } from 'vitest';
+import {
+  parseVCard,
+  generateVCard,
+  contactToVCard,
+  detectDuplicates,
+} from '../vcard';
+import type { ContactCard } from '../../api/types';
+
+describe('parseVCard', () => {
+  it('parses a basic 3.0 card with name, email, and phone', () => {
+    const vcf = [
+      'BEGIN:VCARD',
+      'VERSION:3.0',
+      'FN:Jane Doe',
+      'N:Doe;Jane;;;',
+      'EMAIL;TYPE=WORK:jane@example.com',
+      'TEL;TYPE=CELL:+1-555-0100',
+      'END:VCARD',
+    ].join('\r\n');
+
+    const [card] = parseVCard(vcf);
+    expect(card).toBeTruthy();
+    const emails = Object.values(card.emails ?? {});
+    expect(emails[0].address).toBe('jane@example.com');
+    expect(emails[0].contexts).toEqual({ work: true });
+    const phones = Object.values(card.phones ?? {});
+    expect(phones[0].number).toBe('+1-555-0100');
+    expect(phones[0].features).toEqual({ cell: true });
+    const given = card.name?.components?.find((c) => c.kind === 'given')?.value;
+    const surname = card.name?.components?.find((c) => c.kind === 'surname')?.value;
+    expect(given).toBe('Jane');
+    expect(surname).toBe('Doe');
+  });
+
+  it('parses multiple cards in one file', () => {
+    const vcf = [
+      'BEGIN:VCARD', 'VERSION:3.0', 'FN:A', 'EMAIL:a@x.com', 'END:VCARD',
+      'BEGIN:VCARD', 'VERSION:3.0', 'FN:B', 'EMAIL:b@x.com', 'END:VCARD',
+    ].join('\r\n');
+    expect(parseVCard(vcf)).toHaveLength(2);
+  });
+
+  it('unfolds folded lines and decodes escaped values', () => {
+    const vcf = [
+      'BEGIN:VCARD',
+      'VERSION:3.0',
+      'FN:Long Name',
+      'NOTE:line one\\nline two\\, still going',
+      'END:VCARD',
+    ].join('\r\n');
+    const [card] = parseVCard(vcf);
+    const note = Object.values(card.notes ?? {})[0]?.note;
+    expect(note).toBe('line one\nline two, still going');
+  });
+
+  it('parses CATEGORIES into keywords', () => {
+    const vcf = 'BEGIN:VCARD\r\nVERSION:3.0\r\nFN:Tagged\r\nEMAIL:t@x.com\r\nCATEGORIES:Friends,VIP\r\nEND:VCARD';
+    const [card] = parseVCard(vcf);
+    expect(card.keywords).toEqual({ Friends: true, VIP: true });
+  });
+
+  it('skips cards with neither a name nor an email', () => {
+    const vcf = 'BEGIN:VCARD\r\nVERSION:3.0\r\nNOTE:orphan\r\nEND:VCARD';
+    expect(parseVCard(vcf)).toHaveLength(0);
+  });
+
+  it('strips mailto:/tel: URI schemes', () => {
+    const vcf = 'BEGIN:VCARD\r\nVERSION:4.0\r\nFN:U\r\nEMAIL:mailto:u@x.com\r\nTEL:tel:+15550111\r\nEND:VCARD';
+    const [card] = parseVCard(vcf);
+    expect(Object.values(card.emails ?? {})[0].address).toBe('u@x.com');
+    expect(Object.values(card.phones ?? {})[0].number).toBe('+15550111');
+  });
+});
+
+describe('generateVCard', () => {
+  it('round-trips name and email through parse → generate → parse', () => {
+    const original = 'BEGIN:VCARD\r\nVERSION:3.0\r\nFN:Jane Doe\r\nN:Doe;Jane;;;\r\nEMAIL;TYPE=WORK:jane@example.com\r\nEND:VCARD';
+    const [parsed] = parseVCard(original);
+    const generated = generateVCard([parsed]);
+    expect(generated).toContain('FN:Jane Doe');
+    expect(generated).toContain('EMAIL;TYPE=WORK:jane@example.com');
+
+    const [reparsed] = parseVCard(generated);
+    expect(Object.values(reparsed.emails ?? {})[0].address).toBe('jane@example.com');
+  });
+
+  it('contactToVCard emits a single BEGIN/END block', () => {
+    const card: ContactCard = {
+      id: 'c1',
+      addressBookIds: {},
+      name: { full: 'Solo', components: [{ kind: 'given', value: 'Solo' }] },
+      emails: { e0: { address: 'solo@x.com' } },
+    };
+    const out = contactToVCard(card);
+    expect(out.match(/BEGIN:VCARD/g)).toHaveLength(1);
+    expect(out.match(/END:VCARD/g)).toHaveLength(1);
+  });
+});
+
+describe('detectDuplicates', () => {
+  const existing: ContactCard[] = [
+    { id: 'x1', addressBookIds: {}, emails: { e0: { address: 'dupe@x.com' } } },
+  ];
+
+  it('flags an incoming contact that shares an email (case-insensitive)', () => {
+    const incoming: ContactCard[] = [
+      { id: 'i0', addressBookIds: {}, emails: { e0: { address: 'fresh@x.com' } } },
+      { id: 'i1', addressBookIds: {}, emails: { e0: { address: 'DUPE@x.com' } } },
+    ];
+    const dupes = detectDuplicates(existing, incoming);
+    expect(dupes.has(0)).toBe(false);
+    expect(dupes.get(1)).toBe('x1');
+  });
+
+  it('returns an empty map when nothing overlaps', () => {
+    const incoming: ContactCard[] = [
+      { id: 'i0', addressBookIds: {}, emails: { e0: { address: 'new@x.com' } } },
+    ];
+    expect(detectDuplicates(existing, incoming).size).toBe(0);
+  });
+});

src/lib/birthday-calendar.ts

@@ -0,0 +1,117 @@
+import { eachYearOfInterval, parseISO } from 'date-fns';
+import type { Calendar, CalendarEvent, ContactCard, AnniversaryDate } from '../api/types';
+import { getContactDisplayName } from './contact-utils';
+
+export const BIRTHDAY_CALENDAR_ID = '__birthday-calendar__';
+export const BIRTHDAY_CALENDAR_COLOR = '#eab308'; // yellow
+
+// A read-only virtual calendar holding generated birthday events.
+export function createBirthdayCalendar(name = 'Birthdays'): Calendar {
+  return {
+    id: BIRTHDAY_CALENDAR_ID,
+    name,
+    color: BIRTHDAY_CALENDAR_COLOR,
+    sortOrder: 999,
+    isSubscribed: true,
+    isVisible: true,
+    isDefault: false,
+    myRights: {
+      mayReadItems: true,
+      mayWriteAll: false,
+      mayWriteOwn: false,
+      mayWrite: false,
+      mayDelete: false,
+      mayRSVP: false,
+    },
+  };
+}
+
+function parseBirthdayDate(date: AnniversaryDate): { month: number; day: number; year?: number } | null {
+  if (typeof date === 'string') {
+    if (date.startsWith('--')) {
+      const m = date.match(/^--(\d{2})-(\d{2})$/);
+      return m ? { month: parseInt(m[1], 10), day: parseInt(m[2], 10) } : null;
+    }
+    const parsed = parseISO(date);
+    if (!isNaN(parsed.getTime())) {
+      return { month: parsed.getMonth() + 1, day: parsed.getDate(), year: parsed.getFullYear() };
+    }
+    return null;
+  }
+  if ('utc' in date && date['@type'] === 'Timestamp') {
+    const parsed = parseISO(date.utc);
+    if (!isNaN(parsed.getTime())) {
+      return { month: parsed.getMonth() + 1, day: parsed.getDate(), year: parsed.getFullYear() };
+    }
+    return null;
+  }
+  // PartialDate
+  if (date.month && date.day) {
+    return { month: date.month, day: date.day, year: date.year || undefined };
+  }
+  return null;
+}
+
+// Generate virtual all-day birthday events for the given range from contacts
+// that carry a `birth` anniversary.
+export function generateBirthdayEvents(
+  contacts: ContactCard[],
+  rangeStart: string,
+  rangeEnd: string,
+): CalendarEvent[] {
+  const events: CalendarEvent[] = [];
+  const start = parseISO(rangeStart);
+  const end = parseISO(rangeEnd);
+  if (isNaN(start.getTime()) || isNaN(end.getTime())) return events;
+
+  const years = eachYearOfInterval({ start, end });
+  const endYear = end.getFullYear();
+  if (!years.some((y) => y.getFullYear() === endYear)) {
+    years.push(new Date(endYear, 0, 1));
+  }
+
+  for (const contact of contacts) {
+    if (!contact.anniversaries) continue;
+    for (const [key, anniversary] of Object.entries(contact.anniversaries)) {
+      if (anniversary.kind !== 'birth') continue;
+      const parsed = parseBirthdayDate(anniversary.date);
+      if (!parsed) continue;
+      const displayName = getContactDisplayName(contact);
+      if (!displayName) continue;
+
+      for (const yearDate of years) {
+        const year = yearDate.getFullYear();
+        // Feb 29 in a non-leap year: clamp to Feb 28.
+        let occMonth = parsed.month;
+        let occDay = parsed.day;
+        const occurrence = new Date(year, occMonth - 1, occDay);
+        if (occurrence.getMonth() !== occMonth - 1) {
+          occurrence.setDate(0);
+          occMonth = occurrence.getMonth() + 1;
+          occDay = occurrence.getDate();
+        }
+        if (occurrence < start || occurrence > end) continue;
+
+        const mm = String(occMonth).padStart(2, '0');
+        const dd = String(occDay).padStart(2, '0');
+        const age = parsed.year ? year - parsed.year : undefined;
+        const ageText = age && age > 0 ? ` (${age})` : '';
+
+        events.push({
+          id: `birthday-${contact.id}-${key}-${year}`,
+          '@type': 'Event',
+          uid: `birthday-${contact.id}-${key}`,
+          calendarIds: { [BIRTHDAY_CALENDAR_ID]: true },
+          title: `🎂 ${displayName}${ageText}`,
+          start: `${year}-${mm}-${dd}T00:00:00`,
+          duration: 'P1D',
+          showWithoutTime: true,
+          status: 'confirmed',
+          freeBusyStatus: 'free',
+          color: BIRTHDAY_CALENDAR_COLOR,
+        });
+      }
+    }
+  }
+  return events;
+}

src/lib/calendar-alerts.ts

@@ -0,0 +1,103 @@
+import type { Alert, CalendarEvent } from '../api/types';
+
+// A reminder, expressed as "minutes before the event start". 0 means "at the
+// time of the event". Negative values (reminder *after* start) are preserved
+// on round-trip but the picker only offers non-negative presets.
+export interface Reminder {
+  /** Minutes before start. 0 = at time of event. */
+  minutesBefore: number;
+}
+
+const DURATION_RE = /^(-?)P(?:(\d+)W)?(?:(\d+)D)?(?:T(?:(\d+)H)?(?:(\d+)M)?(?:(\d+)S)?)?$/;
+
+// Parse an ISO 8601 duration offset ("-PT15M", "-P1D", "PT0S") to minutes.
+// Positive return value = minutes *before* the anchor (JSCalendar offsets for
+// reminders are negative, e.g. "-PT15M" fires 15 min before start).
+export function offsetToMinutesBefore(offset: string | undefined): number | null {
+  if (!offset) return null;
+  const m = DURATION_RE.exec(offset);
+  if (!m) return null;
+  const negative = m[1] === '-';
+  const weeks = parseInt(m[2] || '0', 10);
+  const days = parseInt(m[3] || '0', 10);
+  const hours = parseInt(m[4] || '0', 10);
+  const minutes = parseInt(m[5] || '0', 10);
+  const seconds = parseInt(m[6] || '0', 10);
+  const totalMinutes = weeks * 7 * 24 * 60 + days * 24 * 60 + hours * 60 + minutes + Math.round(seconds / 60);
+  // A negative offset (fires before start) is a positive "minutesBefore".
+  // `|| 0` collapses -0 to 0 so callers get a clean "at time of event".
+  return (negative ? totalMinutes : -totalMinutes) || 0;
+}
+
+export function minutesBeforeToOffset(minutesBefore: number): string {
+  if (minutesBefore === 0) return 'PT0S';
+  const sign = minutesBefore > 0 ? '-' : '';
+  let mins = Math.abs(minutesBefore);
+  const days = Math.floor(mins / (24 * 60));
+  mins -= days * 24 * 60;
+  const hours = Math.floor(mins / 60);
+  mins -= hours * 60;
+  let out = 'P';
+  if (days > 0) out += `${days}D`;
+  if (hours > 0 || mins > 0) {
+    out += 'T';
+    if (hours > 0) out += `${hours}H`;
+    if (mins > 0) out += `${mins}M`;
+  }
+  if (out === 'P') out = 'PT0M';
+  return `${sign}${out}`;
+}
+
+// Pull the list of reminders out of an event's `alerts` map. Only display-style
+// offset alerts relative to start are surfaced in the editor; anything exotic is
+// dropped from the UI list (but the event keeps it until the user saves).
+export function alertsToReminders(alerts: CalendarEvent['alerts']): Reminder[] {
+  if (!alerts) return [];
+  const out: Reminder[] = [];
+  for (const alert of Object.values(alerts)) {
+    const trigger = alert?.trigger;
+    if (!trigger) continue;
+    if (trigger.offset === undefined) continue; // skip AbsoluteTriggers in the picker
+    const minutesBefore = offsetToMinutesBefore(trigger.offset);
+    if (minutesBefore === null) continue;
+    out.push({ minutesBefore });
+  }
+  // De-dupe + sort soonest-to-event last (largest lead time first).
+  const seen = new Set<number>();
+  return out
+    .filter((r) => (seen.has(r.minutesBefore) ? false : (seen.add(r.minutesBefore), true)))
+    .sort((a, b) => b.minutesBefore - a.minutesBefore);
+}
+
+export function remindersToAlerts(reminders: Reminder[]): Record<string, Alert> | undefined {
+  if (reminders.length === 0) return undefined;
+  const alerts: Record<string, Alert> = {};
+  reminders.forEach((r, i) => {
+    alerts[`reminder-${i + 1}`] = {
+      trigger: { '@type': 'OffsetTrigger', offset: minutesBeforeToOffset(r.minutesBefore) },
+      action: 'display',
+    };
+  });
+  return alerts;
+}
+
+export function formatReminder(minutesBefore: number): string {
+  if (minutesBefore === 0) return 'At time of event';
+  if (minutesBefore < 0) return `${Math.abs(minutesBefore)} minutes after`;
+  if (minutesBefore < 60) return `${minutesBefore} minute${minutesBefore === 1 ? '' : 's'} before`;
+  if (minutesBefore < 60 * 24) {
+    const h = minutesBefore / 60;
+    return Number.isInteger(h) ? `${h} hour${h === 1 ? '' : 's'} before` : `${minutesBefore} minutes before`;
+  }
+  if (minutesBefore < 60 * 24 * 7) {
+    const d = minutesBefore / (60 * 24);
+    return Number.isInteger(d) ? `${d} day${d === 1 ? '' : 's'} before` : `${(minutesBefore / 60).toFixed(0)} hours before`;
+  }
+  const w = minutesBefore / (60 * 24 * 7);
+  return Number.isInteger(w) ? `${w} week${w === 1 ? '' : 's'} before` : `${(minutesBefore / (60 * 24)).toFixed(0)} days before`;
+}
+
+// Presets offered by the reminder picker (minutes before start).
+export const REMINDER_PRESETS: number[] = [
+  0, 5, 10, 15, 30, 60, 120, 60 * 24, 60 * 24 * 2, 60 * 24 * 7,
+];

src/lib/calendar-invitation.ts

@@ -0,0 +1,148 @@
+import type { CalendarEvent, Participant, Email, Attachment } from '../api/types';
+
+// ─── Address helpers ─────────────────────────────────────
+
+export function normalizeEmail(value?: string | null): string | null {
+  if (!value) return null;
+  const normalized = value.trim().replace(/^mailto:/i, '').toLowerCase();
+  return normalized || null;
+}
+
+export function getParticipantEmail(p: Participant): string | null {
+  const direct = normalizeEmail(p.email);
+  if (direct) return direct;
+  if (p.calendarAddress) {
+    const addr = normalizeEmail(p.calendarAddress);
+    if (addr) return addr;
+  }
+  if (p.sendTo) {
+    for (const addr of Object.values(p.sendTo)) {
+      const n = normalizeEmail(addr);
+      if (n) return n;
+    }
+  }
+  return null;
+}
+
+export function isOrganizerParticipant(p: Participant): boolean {
+  return Boolean(p.roles?.owner || p.roles?.chair);
+}
+
+export function getOrganizerEmail(event: Partial<CalendarEvent>): string | null {
+  if (event.participants) {
+    for (const p of Object.values(event.participants)) {
+      if (isOrganizerParticipant(p)) {
+        const e = getParticipantEmail(p);
+        if (e) return e;
+      }
+    }
+  }
+  if (event.organizerCalendarAddress) return normalizeEmail(event.organizerCalendarAddress);
+  return null;
+}
+
+export function getOrganizerName(event: Partial<CalendarEvent>): string | null {
+  if (event.participants) {
+    for (const p of Object.values(event.participants)) {
+      if (isOrganizerParticipant(p)) return p.name || getParticipantEmail(p);
+    }
+    if (event.organizerCalendarAddress) {
+      for (const p of Object.values(event.participants)) {
+        if (p.calendarAddress === event.organizerCalendarAddress) return p.name || getParticipantEmail(p);
+      }
+    }
+  }
+  return getOrganizerEmail(event);
+}
+
+// Find the participant entry that matches one of the given user emails.
+export function findParticipantByEmail(
+  event: Partial<CalendarEvent>,
+  emails: string[],
+): { id: string; participant: Participant } | null {
+  if (!event.participants || emails.length === 0) return null;
+  const wanted = new Set(emails.map((e) => e.toLowerCase()).filter(Boolean));
+  for (const [id, p] of Object.entries(event.participants)) {
+    const e = getParticipantEmail(p);
+    if (e && wanted.has(e)) return { id, participant: p };
+  }
+  return null;
+}
+
+// `replyTo` to attach to an RSVP so the server knows where to deliver the iTIP
+// reply (Stalwart exposes the organizer as organizerCalendarAddress).
+export function buildReplyTo(event: Partial<CalendarEvent>): Record<string, string> | null {
+  if (event.replyTo) return event.replyTo;
+  if (event.organizerCalendarAddress) {
+    const addr = event.organizerCalendarAddress.startsWith('mailto:')
+      ? event.organizerCalendarAddress
+      : `mailto:${event.organizerCalendarAddress}`;
+    return { imip: addr };
+  }
+  return null;
+}
+
+// ─── iMIP method detection ───────────────────────────────
+
+export type InvitationMethod =
+  | 'publish' | 'request' | 'reply' | 'add'
+  | 'cancel' | 'refresh' | 'counter' | 'declinecounter' | 'unknown';
+
+const KNOWN_METHODS = new Set<InvitationMethod>([
+  'publish', 'request', 'reply', 'add', 'cancel', 'refresh', 'counter', 'declinecounter',
+]);
+
+function normalizeMethod(value?: string | null): InvitationMethod {
+  if (!value) return 'unknown';
+  const v = value.trim().toLowerCase();
+  return KNOWN_METHODS.has(v as InvitationMethod) ? (v as InvitationMethod) : 'unknown';
+}
+
+// JMAP strips Content-Type params (RFC 8621), so `text/calendar; method=REQUEST`
+// arrives as `text/calendar`. The raw ICS METHOD line is the reliable source.
+export function extractMethodFromRawIcs(rawText: string): InvitationMethod {
+  const m = rawText.match(/^METHOD:(\S+)/m);
+  return m ? normalizeMethod(m[1]) : 'unknown';
+}
+
+function looksLikeReply(event: Partial<CalendarEvent>): boolean {
+  if (!event.participants) return false;
+  return Object.values(event.participants).some(
+    (p) =>
+      p.roles?.attendee &&
+      !isOrganizerParticipant(p) &&
+      (p.participationStatus !== 'needs-action' || !!p.participationComment),
+  );
+}
+
+export function inferInvitationMethod(event: Partial<CalendarEvent>): InvitationMethod {
+  if (event.status === 'cancelled') return 'cancel';
+  if (looksLikeReply(event)) return 'reply';
+  if (event.participants && Object.keys(event.participants).length > 0) {
+    if (Object.values(event.participants).some(isOrganizerParticipant) || event.organizerCalendarAddress) {
+      return 'request';
+    }
+  }
+  return 'unknown';
+}
+
+// ─── Calendar attachment detection ───────────────────────
+
+const CAL_MIME = new Set(['text/calendar', 'application/ics', 'application/icalendar']);
+
+function isCalendarType(type?: string | null): boolean {
+  if (!type) return false;
+  const base = type.split(';')[0].trim().toLowerCase();
+  return CAL_MIME.has(base);
+}
+
+export function findCalendarAttachment(email: Pick<Email, 'attachments'>): Attachment | null {
+  if (!email.attachments) return null;
+  for (const att of email.attachments) {
+    const name = att.name?.toLowerCase() || '';
+    if (isCalendarType(att.type) || name.endsWith('.ics') || name.endsWith('.ical')) {
+      return att;
+    }
+  }
+  return null;
+}

src/lib/calendar-utils.ts

@@ -35,13 +35,20 @@ export function parseLocalDateTime(iso: string): Date {
 export function getEventStartDate(
   event: Pick<CalendarEvent, 'start' | 'utcStart' | 'showWithoutTime'>,
 ): Date {
-  const source = !event.showWithoutTime && event.utcStart ? event.utcStart : event.start;
-  return parseISO(source);
+  // Prefer utcStart for timed events but fall back to start if utcStart is
+  // missing or unparseable — a malformed utcStart used to surface as an
+  // Invalid Date that silently dropped the event from every view (#316).
+  if (!event.showWithoutTime && event.utcStart) {
+    const utc = parseISO(event.utcStart);
+    if (!isNaN(utc.getTime())) return utc;
+  }
+  return parseISO(event.start);
 }
 
 export function getEventEndDate(event: CalendarEvent): Date {
   if (!event.showWithoutTime && event.utcEnd) {
-    return parseISO(event.utcEnd);
+    const utc = parseISO(event.utcEnd);
+    if (!isNaN(utc.getTime())) return utc;
   }
   const start = getEventStartDate(event);
   if (!event.duration) return start;
@@ -57,6 +64,17 @@ export function getEventDisplayEndDate(event: CalendarEvent): Date {
   return subMilliseconds(end, 1);
 }
 
+// ─── Time-of-day formatting ──────────────────────────────
+// Maps the user's 12h/24h preference to a date-fns pattern, matching webmail
+// (event-card.tsx: `timeFormat === "12h" ? "h:mm a" : "HH:mm"`). Components
+// thread the `calendarTimeFormat` setting through so the calendar renders
+// times in the same format the webmail does.
+export type TimeFormat = '12h' | '24h';
+
+export function timePattern(timeFormat: TimeFormat | undefined): string {
+  return timeFormat === '12h' ? 'h:mm a' : 'HH:mm';
+}
+
 export interface EventTimeRange {
   start: Date;
   end: Date;
@@ -435,12 +453,63 @@ export function getEventColor(
   event: Pick<CalendarEvent, 'calendarIds' | 'color'>,
   calendars: Calendar[],
 ): string {
-  if (event.color) return event.color;
   const calendarId = Object.keys(event.calendarIds || {})[0];
   const cal = calendars.find((c) => c.id === calendarId);
+  // A local color override on a shared calendar wins over per-event colors,
+  // so the whole shared calendar paints uniformly in the viewer's chosen hue.
+  if (cal?.colorIsLocalOverride && cal.color) return cal.color;
+  if (event.color) return event.color;
   return getCalendarColor(cal);
 }
 
+// ─── Per-viewer colors for shared calendars (#345) ───────
+// Shared calendars are recolored locally only: the viewer usually can't write
+// the owner's calendar, and doing so would recolor it for everyone. Overrides
+// live in the settings store keyed by sharedCalendarColorKey().
+
+/**
+ * Stable key for a shared calendar's local color override. Built from the
+ * owning JMAP account + the calendar id so it stays unique across accounts.
+ */
+export function sharedCalendarColorKey(
+  cal: Pick<Calendar, 'id' | 'accountId'>,
+): string {
+  return `${cal.accountId ?? ''}|${cal.id}`;
+}
+
+/**
+ * Pick a random palette color not present in `usedColors`. Once every palette
+ * entry is taken, fall back to a random palette color (collisions are
+ * unavoidable past CALENDAR_PALETTE.length calendars).
+ */
+export function pickUnusedCalendarColor(usedColors: Iterable<string>): string {
+  const used = new Set<string>();
+  for (const c of usedColors) {
+    if (c) used.add(c.toLowerCase());
+  }
+  const available = CALENDAR_PALETTE.filter((c) => !used.has(c.toLowerCase()));
+  const pool = available.length > 0 ? available : CALENDAR_PALETTE;
+  return pool[Math.floor(Math.random() * pool.length)];
+}
+
+/**
+ * Apply each shared calendar's local color override (per-viewer recolor).
+ * The override replaces the calendar's color and wins over per-event colors
+ * via the `colorIsLocalOverride` flag (see getEventColor). Personal calendars
+ * are passed through untouched.
+ */
+export function applySharedCalendarColors(
+  calendars: Calendar[],
+  overrides: Record<string, string>,
+): Calendar[] {
+  return calendars.map((cal) => {
+    if (!cal.isShared) return cal;
+    const override = overrides[sharedCalendarColorKey(cal)];
+    if (!override) return cal;
+    return { ...cal, color: override, colorIsLocalOverride: true };
+  });
+}
+
 export function getPrimaryCalendarId(
   event: Pick<CalendarEvent, 'calendarIds'>,
 ): string | undefined {

src/lib/capabilities.ts

@@ -0,0 +1,35 @@
+import { CAPABILITIES } from '../api/types';
+import { useAuthStore } from '../stores/auth-store';
+
+// When the session is null (cold start, offline restore) we assume features
+// are available so they don't flicker off mid-restore. Once the live session
+// arrives, the real capability set takes over.
+function sessionHasCapability(capability: string): boolean {
+  const session = useAuthStore.getState().session;
+  if (!session) return true;
+  return capability in session.capabilities;
+}
+
+export function hasCalendarCapability(): boolean {
+  return sessionHasCapability(CAPABILITIES.CALENDARS);
+}
+
+export function hasContactsCapability(): boolean {
+  return sessionHasCapability(CAPABILITIES.CONTACTS);
+}
+
+export function hasFilesCapability(): boolean {
+  return sessionHasCapability(CAPABILITIES.FILES);
+}
+
+export function useHasCalendar(): boolean {
+  return useAuthStore((s) => (s.session ? CAPABILITIES.CALENDARS in s.session.capabilities : true));
+}
+
+export function useHasContacts(): boolean {
+  return useAuthStore((s) => (s.session ? CAPABILITIES.CONTACTS in s.session.capabilities : true));
+}
+
+export function useHasFiles(): boolean {
+  return useAuthStore((s) => (s.session ? CAPABILITIES.FILES in s.session.capabilities : true));
+}

src/lib/compose-html.ts

@@ -3,6 +3,7 @@
 // All values are HTML-escaped before insertion into the document.
 
 import { escapeHtml, stripDangerousTags } from './email-html';
+import type { TimeFormat } from '../stores/settings-store';
 
 export interface ReplyMeta {
   from?: { email?: string; name?: string };
@@ -14,35 +15,62 @@ export interface ReplyMeta {
   receivedAt?: string;
 }
 
+export interface QuoteHeaderOptions {
+  timeFormat?: TimeFormat;
+  locale?: string;
+  unknownLabel?: string;
+}
+
 function escapeForHtmlBody(text: string): string {
   return escapeHtml(text).replace(/\n/g, '<br>');
 }
 
-function senderLabel(from?: { email?: string; name?: string }): string {
-  if (!from) return '';
-  if (from.name && from.email) return `${from.name} <${from.email}>`;
-  return from.name || from.email || '';
+// Webmail's default quote header labels the sender by display name when there
+// is one, falling back to the bare address — not "Name <addr>".
+function senderName(from?: { email?: string; name?: string }, unknownLabel = 'Unknown'): string {
+  if (!from) return unknownLabel;
+  return from.name || from.email || unknownLabel;
 }
 
-function formatDate(iso?: string): string {
+// Mirror the webmail quote-header date: locale- and 12/24h-aware, with a short
+// weekday (lib/quote-header.ts → formatDateTime with weekday/year/month/day).
+function formatQuoteDate(iso: string | undefined, timeFormat: TimeFormat, locale?: string): string {
   if (!iso) return '';
   const d = new Date(iso);
   if (Number.isNaN(d.getTime())) return '';
-  return d.toLocaleString();
+  const intlLocale = !locale || locale === 'en' ? 'en-US' : locale;
+  return d.toLocaleString(intlLocale, {
+    weekday: 'short',
+    year: 'numeric',
+    month: 'short',
+    day: 'numeric',
+    hour: '2-digit',
+    minute: '2-digit',
+    hour12: timeFormat === '12h',
+  });
 }
 
+const BLOCKQUOTE_STYLE = 'margin:0 0 0 0.8ex;border-left:2px solid #ccc;padding-left:1ex';
+
 /**
  * Build the seed HTML for a new compose / reply / forward. Returns an empty
  * paragraph for plain compose (so the contenteditable has a caret target).
+ *
+ * The reply/forward quote header mirrors the webmail default header
+ * (`lib/quote-header.ts`): a reply gets "On <date>, <sender> wrote:" above a
+ * blockquoted body; a forward gets a From/Date/Subject block followed by the
+ * original body (not blockquoted).
  */
 export function buildInitialHtml(
   mode: 'compose' | 'reply' | 'replyAll' | 'forward',
   reply?: ReplyMeta | null,
+  opts: QuoteHeaderOptions = {},
 ): string {
   if (!reply || mode === 'compose') return '<p><br></p>';
 
-  const date = formatDate(reply.receivedAt);
-  const fromStr = senderLabel(reply.from) || 'Unknown';
+  const { timeFormat = '24h', locale, unknownLabel = 'Unknown' } = opts;
+  const date = formatQuoteDate(reply.receivedAt, timeFormat, locale);
+  const fromStr = senderName(reply.from, unknownLabel);
   const subject = reply.subject ?? '';
 
   const quotedBody = reply.htmlBody
@@ -54,27 +82,26 @@ export function buildInitialHtml(
   if (!quotedBody) return '<p><br></p>';
 
   if (mode === 'forward') {
+    // Forwarded message block (From/Date/Subject), body appended unquoted.
     return [
       '<p><br></p>',
       '<div>---------- Forwarded message ----------<br>',
       `From: ${escapeHtml(fromStr)}<br>`,
-      date ? `Date: ${escapeHtml(date)}<br>` : '',
-      subject ? `Subject: ${escapeHtml(subject)}<br>` : '',
-      reply.to && reply.to.length
-        ? `To: ${escapeHtml(reply.to.map(senderLabel).filter(Boolean).join(', '))}<br>`
-        : '',
+      `Date: ${escapeHtml(date)}<br>`,
+      `Subject: ${escapeHtml(subject)}<br><br>`,
       '</div>',
-      `<blockquote style="margin:0 0 0 0.8ex;border-left:2px solid #ccc;padding-left:1ex">${quotedBody}</blockquote>`,
+      quotedBody,
     ].join('');
   }
 
   // reply / replyAll
+  const headerLine = date
+    ? `On ${escapeHtml(date)}, ${escapeHtml(fromStr)} wrote:`
+    : `${escapeHtml(fromStr)} wrote:`;
   return [
     '<p><br></p>',
-    '<div>',
-    `On ${escapeHtml(date || 'a previous date')}, ${escapeHtml(fromStr)} wrote:`,
-    '</div>',
-    `<blockquote style="margin:0 0 0 0.8ex;border-left:2px solid #ccc;padding-left:1ex">${quotedBody}</blockquote>`,
+    `<div>${headerLine}<br></div>`,
+    `<blockquote style="${BLOCKQUOTE_STYLE}">${quotedBody}</blockquote>`,
   ].join('');
 }
 

src/lib/date-format.ts

@@ -0,0 +1,88 @@
+import type { DateFormat, TimeFormat } from '../stores/settings-store';
+
+/**
+ * Formats a received-at date for the email list. Mirrors the webmail
+ * `formatDate` helper (lib/utils.ts) so both clients render list dates the
+ * same way. The style is controlled by the `dateFormat` user setting:
+ *
+ *   - `smart` (default) — locale-aware, age-bucketed:
+ *       today        → time only          ("15:31" or "3:31 PM")
+ *       last 7 days  → short weekday+time ("Fr 15:31", "Fri 3:31 PM")
+ *       older        → full locale date   ("28.04.2026", "04/28/2026")
+ *   - `relative` — relative format ("1h ago", "2d ago").
+ *   - `full` — always the full locale date+time.
+ *
+ * `locale` is the language subtag from the locale store (e.g. "en", "de").
+ */
+export function formatListDate(
+  date: Date | string,
+  opts: { dateFormat: DateFormat; timeFormat: TimeFormat; locale: string },
+): string {
+  const d = typeof date === 'string' ? new Date(date) : date;
+  if (isNaN(d.getTime())) return '';
+  const now = new Date();
+
+  const { dateFormat, timeFormat } = opts;
+  const localeRaw = opts.locale;
+  const locale = localeRaw && localeRaw.length > 0 ? localeRaw : 'en';
+  // `en` alone resolves to en-US in Intl; everything else uses the language
+  // subtag as-is and lets the runtime pick a sensible default region.
+  const intlLocale = locale === 'en' ? 'en-US' : locale;
+  const hour12 = timeFormat === '12h';
+
+  if (dateFormat === 'relative') {
+    const diff = now.getTime() - d.getTime();
+    const minutes = Math.floor(diff / 60000);
+    const hours = Math.floor(diff / 3600000);
+    const days = Math.floor(diff / 86400000);
+    if (minutes < 1) return 'Just now';
+    if (minutes < 60) return `${minutes}m ago`;
+    if (hours < 24) return `${hours}h ago`;
+    if (days < 7) return `${days}d ago`;
+    return d.toLocaleDateString(intlLocale, {
+      month: 'short',
+      day: 'numeric',
+      year: d.getFullYear() !== now.getFullYear() ? 'numeric' : undefined,
+    });
+  }
+
+  if (dateFormat === 'full') {
+    return d.toLocaleString(intlLocale, {
+      year: 'numeric',
+      month: '2-digit',
+      day: '2-digit',
+      hour: '2-digit',
+      minute: '2-digit',
+      hour12,
+    });
+  }
+
+  // 'smart' (default)
+  const timeStr = d.toLocaleTimeString(intlLocale, {
+    hour: '2-digit',
+    minute: '2-digit',
+    hour12,
+  });
+
+  const isSameDay =
+    d.getFullYear() === now.getFullYear() &&
+    d.getMonth() === now.getMonth() &&
+    d.getDate() === now.getDate();
+  if (isSameDay) return timeStr;
+
+  const daysAgo = Math.floor((now.getTime() - d.getTime()) / 86400000);
+  if (daysAgo < 7) {
+    // German Intl outputs "Fr." with a trailing dot for `weekday: 'short'`;
+    // strip it so the result reads cleanly next to the time.
+    const weekday = d
+      .toLocaleDateString(intlLocale, { weekday: 'short' })
+      .replace(/\.$/, '');
+    return `${weekday} ${timeStr}`;
+  }
+
+  return d.toLocaleDateString(intlLocale, {
+    year: 'numeric',
+    month: '2-digit',
+    day: '2-digit',
+  });
+}

src/lib/download-filename.ts

@@ -0,0 +1,234 @@
+import type { Email } from '../api/types';
+
+// Ported from the webmail `lib/download-filename.ts` so exported `.eml` files and
+// downloaded attachments get the same templated, cross-platform-safe filenames.
+
+// Allow any Unicode letter or digit (so umlauts, accents, CJK survive) plus a
+// small set of safe punctuation. Everything else - emojis, RTL/zero-width
+// marks, control chars, and the filesystem-reserved `<>:"/\|?*` - collapses
+// to `_`. Keeps filenames usable across Android/iOS/desktop.
+const SAFE_CHARS = /[^\p{L}\p{N} _\-().,!@#&+=[\]{}']/gu;
+
+export type SpaceReplacement = 'keep' | 'underscore' | 'dash';
+
+export interface FilenameTransformOptions {
+  spaceReplacement?: SpaceReplacement;
+  lowercase?: boolean;
+  stripDiacritics?: boolean;
+  collapseSeparators?: boolean;
+}
+
+export interface EmailFilenameOptions extends FilenameTransformOptions {
+  template?: string;
+}
+
+export const DEFAULT_TRANSFORM: Required<FilenameTransformOptions> = {
+  spaceReplacement: 'keep',
+  lowercase: false,
+  stripDiacritics: false,
+  collapseSeparators: true,
+};
+
+export const DEFAULT_EMAIL_TEMPLATE = '{date} ({from}-{to}) {subject}';
+export const DEFAULT_ATTACHMENT_TEMPLATE = '{filename}';
+
+export const EMAIL_TOKENS: { token: string; description: string }[] = [
+  { token: 'date', description: 'Full date and time, e.g. 2026-05-22 14.05.33' },
+  { token: 'date_short', description: 'Date only, e.g. 2026-05-22' },
+  { token: 'time', description: 'Time only, e.g. 14.05.33' },
+  { token: 'year', description: '4-digit year' },
+  { token: 'month', description: '2-digit month' },
+  { token: 'day', description: '2-digit day' },
+  { token: 'from', description: 'Sender display name (falls back to email user part)' },
+  { token: 'from_email', description: 'Sender full email address' },
+  { token: 'from_name', description: 'Sender name only' },
+  { token: 'to', description: 'First recipient display name' },
+  { token: 'to_email', description: 'First recipient full email address' },
+  { token: 'to_name', description: 'First recipient name only' },
+  { token: 'subject', description: 'Email subject' },
+];
+
+export const ATTACHMENT_TOKENS: { token: string; description: string }[] = [
+  ...EMAIL_TOKENS,
+  { token: 'filename', description: 'Original attachment filename including extension' },
+  { token: 'name', description: 'Attachment filename without extension' },
+  { token: 'ext', description: 'Attachment file extension without leading dot' },
+];
+
+function sanitizePart(input: string, maxLen = 80): string {
+  const cleaned = input
+    .replace(SAFE_CHARS, '_')
+    .replace(/_+/g, '_')
+    .replace(/\s+/g, ' ')
+    .trim()
+    .replace(/^[._-]+|[._-]+$/g, '');
+  return cleaned.slice(0, maxLen);
+}
+
+function applyTransforms(input: string, opts: FilenameTransformOptions): string {
+  let s = input;
+  if (opts.stripDiacritics) {
+    // NFD splits "ä" into "a" + U+0308 (combining diaeresis); stripping all
+    // combining marks then leaves plain ASCII letters.
+    s = s.normalize('NFD').replace(/\p{M}+/gu, '');
+  }
+  const repl = opts.spaceReplacement ?? 'keep';
+  if (repl === 'underscore') s = s.replace(/ +/g, '_');
+  else if (repl === 'dash') s = s.replace(/ +/g, '-');
+  if (opts.collapseSeparators ?? true) {
+    s = s.replace(/_+/g, '_').replace(/-+/g, '-').replace(/ +/g, ' ');
+  }
+  if (opts.lowercase) s = s.toLocaleLowerCase();
+  return s.replace(/^[._\- ]+|[._\- ]+$/g, '');
+}
+
+function pad2(n: number): string {
+  return String(n).padStart(2, '0');
+}
+
+function dateParts(iso: string | null | undefined) {
+  const d = iso ? new Date(iso) : new Date();
+  if (Number.isNaN(d.getTime())) {
+    return {
+      date: '0000-00-00 00.00.00',
+      date_short: '0000-00-00',
+      time: '00.00.00',
+      year: '0000',
+      month: '00',
+      day: '00',
+    };
+  }
+  const year = String(d.getFullYear());
+  const month = pad2(d.getMonth() + 1);
+  const day = pad2(d.getDate());
+  const time = `${pad2(d.getHours())}.${pad2(d.getMinutes())}.${pad2(d.getSeconds())}`;
+  return {
+    date: `${year}-${month}-${day} ${time}`,
+    date_short: `${year}-${month}-${day}`,
+    time,
+    year,
+    month,
+    day,
+  };
+}
+
+function addrLabel(addr: { name?: string | null; email?: string } | undefined): {
+  name: string;
+  email: string;
+  label: string;
+} {
+  if (!addr) return { name: '', email: '', label: 'unknown' };
+  const name = (addr.name && addr.name.trim()) || '';
+  const email = addr.email || '';
+  const label = name || email.split('@')[0] || email || 'unknown';
+  return { name, email, label };
+}
+
+export function emailVars(email: Email): Record<string, string> {
+  const dp = dateParts(email.receivedAt || email.sentAt);
+  const from = addrLabel(email.from?.[0]);
+  const to = addrLabel(email.to?.[0]);
+  return {
+    ...dp,
+    from: from.label,
+    from_email: from.email,
+    from_name: from.name,
+    to: to.label,
+    to_email: to.email,
+    to_name: to.name,
+    subject: email.subject || 'no subject',
+  };
+}
+
+export interface AttachmentLike {
+  name?: string | null;
+  type?: string | null;
+}
+
+export function attachmentVars(email: Email, attachment: AttachmentLike): Record<string, string> {
+  const filename = (attachment.name || 'attachment').trim();
+  const dot = filename.lastIndexOf('.');
+  const hasExt = dot > 0 && dot < filename.length - 1;
+  const name = hasExt ? filename.slice(0, dot) : filename;
+  const ext = hasExt ? filename.slice(dot + 1) : '';
+  return {
+    ...emailVars(email),
+    filename,
+    name,
+    ext,
+  };
+}
+
+function renderRaw(template: string, vars: Record<string, string>): string {
+  return template.replace(/\{(\w+)\}/g, (_, key: string) => {
+    const value = vars[key];
+    if (value === undefined) return '';
+    return sanitizePart(value);
+  });
+}
+
+export function emailExportFilename(
+  email: Email,
+  options: EmailFilenameOptions | string = {},
+): string {
+  const opts = typeof options === 'string' ? { template: options } : options;
+  const template = opts.template ?? DEFAULT_EMAIL_TEMPLATE;
+  const rendered = renderRaw(template, emailVars(email));
+  const cleaned = sanitizePart(rendered, 200);
+  const transformed = applyTransforms(cleaned, opts);
+  const stem = transformed.slice(0, 200) || 'email';
+  return `${stem}.eml`;
+}
+
+export function attachmentDownloadFilename(
+  email: Email | null | undefined,
+  attachment: AttachmentLike,
+  options: EmailFilenameOptions | string = {},
+): string {
+  const opts = typeof options === 'string' ? { template: options } : options;
+  const template = opts.template ?? DEFAULT_ATTACHMENT_TEMPLATE;
+  if (!email) {
+    const filename = (attachment.name || 'attachment').trim();
+    const cleaned = sanitizePart(filename, 200) || 'attachment';
+    return applyTransforms(cleaned, opts) || cleaned;
+  }
+  const vars = attachmentVars(email, attachment);
+  const rendered = template.replace(/\{(\w+)\}/g, (_, key: string) => {
+    const value = vars[key];
+    if (value === undefined) return '';
+    // Preserve dots in {filename} so the original extension survives the
+    // sanitiser (it strips trailing dots otherwise).
+    return key === 'filename' ? value.replace(SAFE_CHARS, '_') : sanitizePart(value);
+  });
+  const templateMentionsExt = /\{(ext|filename)\}/.test(template);
+  const cleaned = sanitizePart(rendered, 200) || 'attachment';
+  if (templateMentionsExt) {
+    return applyTransforms(cleaned, opts) || cleaned;
+  }
+  const transformedStem = applyTransforms(cleaned, opts) || cleaned;
+  const ext = vars.ext;
+  if (!ext) return transformedStem;
+  const transformedExt = opts.lowercase ? ext.toLocaleLowerCase() : ext;
+  return `${transformedStem}.${transformedExt}`;
+}
+
+// Build a synthetic email for previewing templates in the settings UI.
+export function buildSampleEmail(): Email {
+  const iso = '2026-05-22T14:05:33Z';
+  return {
+    id: 'sample-1',
+    threadId: 'sample-thread-1',
+    mailboxIds: { inbox: true },
+    keywords: { $seen: true },
+    size: 12345,
+    receivedAt: iso,
+    sentAt: iso,
+    from: [{ name: 'Alice Sender', email: 'alice@example.com' }],
+    to: [{ name: 'Bob Recipient', email: 'bob@example.com' }],
+    cc: [],
+    subject: 'Benachrichtigung von Ihrem Gerät',
+    preview: '',
+    hasAttachment: true,
+    blobId: 'sample-blob',
+  } as Email;
+}

src/lib/email-export.ts

@@ -2,10 +2,38 @@ import { Directory, File, Paths } from 'expo-file-system';
 import * as Sharing from 'expo-sharing';
 import { jmapClient } from '../api/jmap-client';
 import { getDownloadUrl } from '../api/blob';
+import type { Email } from '../api/types';
+import { useSettingsStore } from '../stores/settings-store';
+import {
+  attachmentDownloadFilename,
+  emailExportFilename,
+  type EmailFilenameOptions,
+} from './download-filename';
 import { getClientCertAlias, secureFetch } from './client-cert';
 
 const RFC822 = 'message/rfc822';
 
+// Read the user's filename template + transform preferences for exports.
+function emailFileOptions(): EmailFilenameOptions {
+  const s = useSettingsStore.getState();
+  return {
+    template: s.emailExportTemplate,
+    spaceReplacement: s.exportSpaceReplacement,
+    lowercase: s.exportLowercase,
+    stripDiacritics: s.exportStripDiacritics,
+  };
+}
+
+function attachmentFileOptions(): EmailFilenameOptions {
+  const s = useSettingsStore.getState();
+  return {
+    template: s.attachmentExportTemplate,
+    spaceReplacement: s.exportSpaceReplacement,
+    lowercase: s.exportLowercase,
+    stripDiacritics: s.exportStripDiacritics,
+  };
+}
+
 function authHeader(): string {
   return jmapClient.authHeader;
 }
@@ -60,11 +88,16 @@ export async function shareAttachment(
   blobId: string,
   name: string | undefined,
   type: string | undefined,
+  email?: Email | null,
+  // Owning account for blobs shared by another principal (Files app).
+  accountId?: string,
 ): Promise<void> {
-  const filename = safeAttachmentName(name, type);
+  const filename = email
+    ? attachmentDownloadFilename(email, { name, type }, attachmentFileOptions())
+    : safeAttachmentName(name, type);
   const mimeType = type || 'application/octet-stream';
   const dest = new File(Paths.cache, filename);
-  const url = getDownloadUrl(blobId, filename, mimeType);
+  const url = getDownloadUrl(blobId, filename, mimeType, accountId);
   const downloaded = await downloadInto(url, dest, Paths.cache);
   if (!(await Sharing.isAvailableAsync())) {
     throw new Error('Sharing is not available on this device');
@@ -84,11 +117,16 @@ export async function downloadAttachment(
   blobId: string,
   name: string | undefined,
   type: string | undefined,
+  email?: Email | null,
+  // Owning account for blobs shared by another principal (Files app).
+  accountId?: string,
 ): Promise<void> {
-  const filename = safeAttachmentName(name, type);
+  const filename = email
+    ? attachmentDownloadFilename(email, { name, type }, attachmentFileOptions())
+    : safeAttachmentName(name, type);
   const mimeType = type || 'application/octet-stream';
   const dest = new File(Paths.document, filename);
-  const url = getDownloadUrl(blobId, filename, mimeType);
+  const url = getDownloadUrl(blobId, filename, mimeType, accountId);
   const downloaded = await downloadInto(url, dest, Paths.document);
   if (!(await Sharing.isAvailableAsync())) {
     throw new Error('Sharing is not available on this device');
@@ -111,8 +149,15 @@ function safeFilename(subject: string | undefined): string {
   return `${base}.eml`;
 }
 
-export async function shareEmailEml(blobId: string, subject?: string): Promise<void> {
-  const dest = new File(Paths.cache, safeFilename(subject));
+export async function shareEmailEml(
+  blobId: string,
+  email?: Email | null,
+  subjectFallback?: string,
+): Promise<void> {
+  const filename = email
+    ? emailExportFilename(email, emailFileOptions())
+    : safeFilename(subjectFallback);
+  const dest = new File(Paths.cache, filename);
   const url = getDownloadUrl(blobId, dest.name, RFC822);
   const downloaded = await downloadInto(url, dest, Paths.cache);
   if (!(await Sharing.isAvailableAsync())) {

src/lib/eml-import.ts

@@ -0,0 +1,52 @@
+import { File } from 'expo-file-system';
+
+// Mirrors the webmail `lib/eml-import.ts`: turn picked files into a flat list of
+// importable `.eml` messages, expanding `.zip` archives along the way. On RN the
+// picker hands us file URIs (file:// or content://) rather than File objects, so
+// we read bytes via expo-file-system and upload those.
+
+export interface ImportableEml {
+  name: string;
+  bytes: Uint8Array;
+}
+
+export const EML_IMPORT_TYPES = [
+  'message/rfc822',
+  'application/zip',
+  'application/x-zip-compressed',
+  'application/octet-stream', // some pickers report .eml/.zip as octet-stream
+];
+
+function isEmlName(name: string): boolean {
+  return /\.eml$/i.test(name);
+}
+
+function isZip(name: string, mime?: string): boolean {
+  return /\.zip$/i.test(name) || mime === 'application/zip' || mime === 'application/x-zip-compressed';
+}
+
+async function extractEmlsFromZip(bytes: Uint8Array): Promise<ImportableEml[]> {
+  const { default: JSZip } = await import('jszip');
+  const zip = await JSZip.loadAsync(bytes);
+  const out: ImportableEml[] = [];
+  for (const entry of Object.values(zip.files)) {
+    if (entry.dir || !isEmlName(entry.name)) continue;
+    const data = await entry.async('uint8array');
+    out.push({ name: entry.name.split(/[\\/]/).pop() || entry.name, bytes: data });
+  }
+  return out;
+}
+
+/**
+ * Expand a single picked file (by URI) into its importable `.eml` messages.
+ * A `.eml` yields one entry; a `.zip` yields one per `.eml` it contains.
+ */
+export async function expandImportableEml(
+  uri: string,
+  name: string,
+  mime?: string,
+): Promise<ImportableEml[]> {
+  const bytes = await new File(uri).bytes();
+  if (isZip(name, mime)) return extractEmlsFromZip(bytes);
+  return [{ name, bytes }];
+}

src/lib/install-update.ts

@@ -3,12 +3,18 @@ import { File, Paths } from 'expo-file-system';
 import * as FileSystemLegacy from 'expo-file-system/legacy';
 import * as IntentLauncher from 'expo-intent-launcher';
 import type { ReleaseAsset } from '../api/updates';
+import { Sha256 } from './sha256';
 
 const FLAG_GRANT_READ_URI_PERMISSION = 0x00000001;
 const FLAG_ACTIVITY_NEW_TASK = 0x10000000;
 
+// Bytes per file-read chunk while computing the post-download SHA-256. Larger
+// chunks are faster but balloon the JS string buffer (base64 reads on this
+// platform). 256 KiB keeps memory bounded while still amortising the bridge.
+const HASH_CHUNK_BYTES = 256 * 1024;
+
 export interface InstallProgress {
-  phase: 'downloading' | 'installing';
+  phase: 'downloading' | 'verifying' | 'installing';
   /** 0-1 during download; undefined for installing phase */
   progress?: number;
   /** Bytes received during current download */
@@ -19,10 +25,51 @@ export interface InstallProgress {
 
 export type InstallProgressListener = (p: InstallProgress) => void;
 
+export interface InstallParams {
+  asset: ReleaseAsset;
+  /** Optional lower-case hex SHA-256. When present, mismatched downloads abort. */
+  expectedSha256?: string | null;
+}
+
+function base64ToBytes(b64: string): Uint8Array {
+  const bin = globalThis.atob ? globalThis.atob(b64) : atob(b64);
+  const out = new Uint8Array(bin.length);
+  for (let i = 0; i < bin.length; i++) out[i] = bin.charCodeAt(i);
+  return out;
+}
+
+async function hashFile(uri: string, totalBytes: number, onProgress?: InstallProgressListener): Promise<string> {
+  const hasher = new Sha256();
+  let offset = 0;
+  while (offset < totalBytes || totalBytes === 0) {
+    const length = Math.min(HASH_CHUNK_BYTES, totalBytes ? totalBytes - offset : HASH_CHUNK_BYTES);
+    const chunkB64 = await FileSystemLegacy.readAsStringAsync(uri, {
+      encoding: FileSystemLegacy.EncodingType.Base64,
+      position: offset,
+      length,
+    });
+    if (!chunkB64) break;
+    const bytes = base64ToBytes(chunkB64);
+    if (bytes.length === 0) break;
+    hasher.update(bytes);
+    offset += bytes.length;
+    if (totalBytes > 0) {
+      onProgress?.({ phase: 'verifying', progress: offset / totalBytes });
+    }
+    if (bytes.length < length) break;
+  }
+  return hasher.digestHex();
+}
+
 export async function downloadAndInstallApk(
-  asset: ReleaseAsset,
+  params: InstallParams | ReleaseAsset,
   onProgress?: InstallProgressListener,
 ): Promise<void> {
+  // Backwards-compat: callers used to pass the asset directly. Promote to the
+  // params shape so the verification path is opt-in by passing a checksum.
+  const { asset, expectedSha256 }: InstallParams =
+    'asset' in params ? params : { asset: params, expectedSha256: null };
+
   if (Platform.OS !== 'android') {
     throw new Error('APK install is only supported on Android');
   }
@@ -53,6 +100,33 @@ export async function downloadAndInstallApk(
     throw new Error('APK download failed');
   }
 
+  // Size sanity check. GitHub's `assets[].size` is signed by their TLS cert,
+  // so a byte-count mismatch is a strong signal the file was truncated /
+  // tampered with in transport. Cheap to compute, fail-fast.
+  const info = await FileSystemLegacy.getInfoAsync(result.uri);
+  const actualSize = (info as { size?: number }).size ?? 0;
+  if (asset.size > 0 && actualSize !== asset.size) {
+    await tryDelete(result.uri);
+    throw new Error(
+      `APK size mismatch: expected ${asset.size} bytes, got ${actualSize}`,
+    );
+  }
+
+  // SHA-256 verification when the release publishes one. Without it, we still
+  // get Android's package-signer check at install time — which rejects an APK
+  // signed with a different key — but that fails late (after the user sees a
+  // confusing system dialog). Bailing here surfaces the problem cleanly.
+  if (expectedSha256) {
+    onProgress?.({ phase: 'verifying', progress: 0 });
+    const actual = await hashFile(result.uri, actualSize || asset.size, onProgress);
+    if (actual.toLowerCase() !== expectedSha256.toLowerCase()) {
+      await tryDelete(result.uri);
+      throw new Error(
+        `APK checksum mismatch: expected ${expectedSha256}, got ${actual}`,
+      );
+    }
+  }
+
   onProgress?.({ phase: 'installing' });
 
   const contentUri = await FileSystemLegacy.getContentUriAsync(result.uri);
@@ -64,6 +138,14 @@ export async function downloadAndInstallApk(
   });
 }
 
+async function tryDelete(uri: string): Promise<void> {
+  try {
+    await FileSystemLegacy.deleteAsync(uri, { idempotent: true });
+  } catch {
+    /* best effort */
+  }
+}
+
 /**
  * Open the system "Install unknown apps" settings page for this app, so the
  * user can grant permission to install APKs from the package installer.

src/lib/network-error.ts

@@ -0,0 +1,39 @@
+// Classify an error thrown by a JMAP call as a *transient* connectivity
+// failure (server unreachable, offline, session not yet up) versus a
+// *permanent* one (the server received the request and rejected it, e.g. a
+// 4xx). The offline outbox uses this to decide whether to keep an operation
+// queued for a later retry or to give up on it.
+//
+// We err on the side of "transient" only for signals we recognise as
+// connectivity-related; anything else (including bare 4xx/5xx responses) is
+// treated as permanent so a poison operation can't wedge the queue forever.
+
+import { useNetworkStore } from '../stores/network-store';
+
+const TRANSIENT_NAMES = new Set([
+  'NetworkError',     // jmap-client transport wrapper
+  'AbortError',       // request aborted (e.g. app backgrounded)
+  'TypeError',        // RN fetch throws TypeError("Network request failed")
+]);
+
+const TRANSIENT_MESSAGE_HINTS = [
+  'network request failed',
+  'network error',
+  'failed to fetch',
+  'not connected',
+  'session expired',   // token refresh will happen on the next live request
+  'timeout',
+  'timed out',
+  'connection',
+];
+
+export function isTransientNetworkError(err: unknown): boolean {
+  // If the device itself reports offline, treat any failure as transient.
+  if (!useNetworkStore.getState().online) return true;
+
+  if (!(err instanceof Error)) return false;
+  if (TRANSIENT_NAMES.has(err.name)) return true;
+
+  const msg = err.message?.toLowerCase() ?? '';
+  return TRANSIENT_MESSAGE_HINTS.some((hint) => msg.includes(hint));
+}

src/lib/oauth.ts

@@ -0,0 +1,250 @@
+import * as WebBrowser from 'expo-web-browser';
+import { secureFetch } from './client-cert';
+
+// Webmail-mediated login. The app opens the webmail's normal login page with
+// extra `mobile_redirect_uri` and `mobile_state` query params. The webmail
+// uses its existing password and OAuth flows, and once the user is signed
+// in, redirects back to the app's custom scheme with credentials packed into
+// the URL fragment. Fragments aren't sent to the server, so password and
+// token material don't appear in HTTP access logs along the way.
+
+export const HANDOFF_REDIRECT_URI = 'bulwarkmobile://auth/callback';
+
+export interface OAuthTokens {
+  accessToken: string;
+  refreshToken?: string;
+  expiresAt?: number; // epoch ms
+  tokenEndpoint: string;
+  clientId: string;
+}
+
+export type HandoffResult =
+  | {
+      flow: 'password';
+      serverUrl: string;
+      username: string;
+      password: string;
+    }
+  | {
+      flow: 'oauth';
+      serverUrl: string;
+      tokens: OAuthTokens;
+    };
+
+export class HandoffError extends Error {}
+export class HandoffCancelledError extends HandoffError {
+  constructor() {
+    super('Sign-in cancelled');
+  }
+}
+
+function randomState(): string {
+  const bytes = new Uint8Array(16);
+  for (let i = 0; i < bytes.length; i++) bytes[i] = Math.floor(Math.random() * 256);
+  let s = '';
+  for (const b of bytes) s += b.toString(16).padStart(2, '0');
+  return s;
+}
+
+function buildHandoffUrl(webmailUrl: string, state: string): string {
+  const base = webmailUrl.replace(/\/+$/, '');
+  const params = new URLSearchParams({
+    mobile_redirect_uri: HANDOFF_REDIRECT_URI,
+    mobile_state: state,
+  });
+  return `${base}/login?${params.toString()}`;
+}
+
+function parseFragment(url: string): URLSearchParams {
+  const hashIdx = url.indexOf('#');
+  if (hashIdx === -1) return new URLSearchParams();
+  return new URLSearchParams(url.slice(hashIdx + 1));
+}
+
+export async function runWebmailHandoff(webmailUrl: string): Promise<HandoffResult> {
+  const state = randomState();
+  const handoffUrl = buildHandoffUrl(webmailUrl, state);
+
+  const result = await WebBrowser.openAuthSessionAsync(handoffUrl, HANDOFF_REDIRECT_URI);
+
+  if (result.type === 'cancel' || result.type === 'dismiss') {
+    throw new HandoffCancelledError();
+  }
+  if (result.type !== 'success' || !result.url) {
+    throw new HandoffError(`Sign-in failed: ${result.type}`);
+  }
+
+  const params = parseFragment(result.url);
+  const err = params.get('error');
+  if (err) throw new HandoffError(err);
+
+  // CSRF guard: the state we generated must round-trip through the webmail
+  // unchanged. A mismatch means the redirect didn't come from the flow we
+  // started, and the rest of the fragment shouldn't be trusted.
+  if (params.get('state') !== state) {
+    throw new HandoffError('State mismatch');
+  }
+
+  const flow = params.get('flow');
+  const serverUrl = params.get('server_url');
+  if (!serverUrl) throw new HandoffError('Sign-in response missing server URL');
+
+  if (flow === 'password') {
+    const username = params.get('username');
+    const password = params.get('password');
+    if (!username || !password) {
+      throw new HandoffError('Sign-in response missing credentials');
+    }
+    return { flow: 'password', serverUrl, username, password };
+  }
+
+  if (flow === 'oauth') {
+    const accessToken = params.get('access_token');
+    const tokenEndpoint = params.get('token_endpoint');
+    const clientId = params.get('client_id');
+    if (!accessToken || !tokenEndpoint || !clientId) {
+      throw new HandoffError('Sign-in response missing OAuth tokens');
+    }
+    const refreshToken = params.get('refresh_token') ?? undefined;
+    const expiresIn = params.get('expires_in');
+    return {
+      flow: 'oauth',
+      serverUrl,
+      tokens: {
+        accessToken,
+        refreshToken,
+        expiresAt: expiresIn ? Date.now() + parseInt(expiresIn, 10) * 1000 : undefined,
+        tokenEndpoint,
+        clientId,
+      },
+    };
+  }
+
+  throw new HandoffError(`Unknown sign-in flow: ${flow ?? 'missing'}`);
+}
+
+// QR login payloads. A QR scanned on the login screen either bootstraps the
+// server URL for the normal webmail handoff (`connect`), or carries a one-time
+// cross-device pairing code minted by an already-signed-in webmail (`pair`).
+// The payload never contains credentials — the `pair` code is redeemed for
+// tokens over the network, once.
+export type QrLoginPayload =
+  | { kind: 'connect'; webmailUrl: string }
+  | { kind: 'pair'; webmailUrl: string; code: string };
+
+export function parseQrLoginPayload(raw: string): QrLoginPayload | null {
+  const trimmed = raw.trim();
+
+  // Custom scheme: bulwarkmail://connect?server=... | bulwarkmail://pair?server=...&code=...
+  const match = /^bulwarkmail:\/\/(connect|pair)\?(.*)$/i.exec(trimmed);
+  if (match) {
+    const kind = match[1].toLowerCase();
+    const params = new URLSearchParams(match[2]);
+    const server = params.get('server');
+    if (!server || !/^https?:\/\//i.test(server)) return null;
+    if (kind === 'pair') {
+      const code = params.get('code');
+      if (!code) return null;
+      return { kind: 'pair', webmailUrl: server, code };
+    }
+    return { kind: 'connect', webmailUrl: server };
+  }
+
+  // A bare https URL is treated as a server-bootstrap target so admins can
+  // hand out a plain webmail URL QR without the custom-scheme wrapper.
+  if (/^https?:\/\//i.test(trimmed)) {
+    return { kind: 'connect', webmailUrl: trimmed };
+  }
+
+  return null;
+}
+
+// Cross-device pairing redemption. Posts the scanned code to the webmail that
+// minted it and maps the token bundle into the same shape the in-browser OAuth
+// handoff produces, so the caller can reuse the existing connectWithOAuth path.
+export async function redeemPairingCode(webmailUrl: string, code: string): Promise<HandoffResult> {
+  const base = webmailUrl.replace(/\/+$/, '');
+  let response: Response;
+  try {
+    response = await secureFetch(`${base}/api/auth/pair/redeem`, {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json', Accept: 'application/json' },
+      body: JSON.stringify({ pairing_code: code }),
+    });
+  } catch {
+    throw new HandoffError('Could not reach the server to complete pairing');
+  }
+
+  if (!response.ok) {
+    // The code was unknown, already used, or expired (server returns 400) —
+    // or something else went wrong. Either way the user needs a fresh QR.
+    throw new HandoffError('Pairing code is invalid or has expired');
+  }
+
+  const data = (await response.json()) as {
+    server_url?: string;
+    access_token?: string;
+    refresh_token?: string;
+    expires_in?: number;
+    token_endpoint?: string;
+    client_id?: string;
+  };
+
+  if (!data.server_url || !data.access_token || !data.token_endpoint || !data.client_id) {
+    throw new HandoffError('Pairing response missing token material');
+  }
+
+  return {
+    flow: 'oauth',
+    serverUrl: data.server_url,
+    tokens: {
+      accessToken: data.access_token,
+      refreshToken: data.refresh_token ?? undefined,
+      expiresAt: data.expires_in ? Date.now() + data.expires_in * 1000 : undefined,
+      tokenEndpoint: data.token_endpoint,
+      clientId: data.client_id,
+    },
+  };
+}
+
+// OAuth refresh — exchanges the refresh token at the original token endpoint
+// for a new access token. Returns the updated bundle so the caller can
+// persist it.
+export async function refreshOAuthAccessToken(tokens: OAuthTokens): Promise<OAuthTokens> {
+  if (!tokens.refreshToken) {
+    throw new HandoffError('No refresh token available');
+  }
+  const body = new URLSearchParams({
+    grant_type: 'refresh_token',
+    refresh_token: tokens.refreshToken,
+    client_id: tokens.clientId,
+  });
+  const response = await secureFetch(tokens.tokenEndpoint, {
+    method: 'POST',
+    headers: {
+      'Content-Type': 'application/x-www-form-urlencoded',
+      Accept: 'application/json',
+    },
+    body: body.toString(),
+  });
+  if (!response.ok) {
+    throw new HandoffError(`Token refresh failed: ${response.status}`);
+  }
+  const data = (await response.json()) as {
+    access_token?: string;
+    refresh_token?: string;
+    expires_in?: number;
+  };
+  if (!data.access_token) {
+    throw new HandoffError('Token refresh response missing access_token');
+  }
+  return {
+    accessToken: data.access_token,
+    refreshToken: data.refresh_token ?? tokens.refreshToken,
+    expiresAt: data.expires_in ? Date.now() + data.expires_in * 1000 : undefined,
+    tokenEndpoint: tokens.tokenEndpoint,
+    clientId: tokens.clientId,
+  };
+}
+
+WebBrowser.maybeCompleteAuthSession();

src/lib/offline-sync.ts

@@ -30,6 +30,8 @@ const FETCH_CHUNK_FALLBACK = 25;
 
 export interface RunOptions {
   days: number;
+  /** Hard cap on the cache in megabytes; oldest mail is evicted to fit. */
+  maxMB?: number;
 }
 
 export async function runOfflineSync(opts: RunOptions): Promise<void> {
@@ -77,6 +79,7 @@ export async function runOfflineSync(opts: RunOptions): Promise<void> {
   cache.setSyncState({ completed: skipped });
 
   if (toFetch.length === 0) {
+    if (opts.maxMB) await cache.evictToFit(opts.maxMB * 1024 * 1024);
     cache.setSyncState({
       phase: 'done',
       finishedAt: Date.now(),
@@ -131,6 +134,10 @@ export async function runOfflineSync(opts: RunOptions): Promise<void> {
     cache.setSyncState({ completed, fetched, bytes });
   }
 
+  // Trim the cache back under its size cap, shedding the oldest mail. Done
+  // after fetching so we never evict something we're about to keep.
+  if (opts.maxMB) await cache.evictToFit(opts.maxMB * 1024 * 1024);
+
   cache.setSyncState({
     phase: 'done',
     completed: total,

src/lib/push-background-task.ts

@@ -8,13 +8,22 @@ import {
   getFaviconDomain,
   getFaviconUrl,
 } from './avatar-utils';
+import {
+  deviceClientIdKey,
+  lastNotifiedKey,
+  migrateLegacyPushKeys,
+  readPushAccountIds,
+} from './push-notifications';
 
-const PUSH_ACCOUNT_ID_KEY = 'push:accountId:v1';
-const LAST_NOTIFIED_EMAIL_ID_KEY = 'push:lastNotifiedEmailId:v1';
 // Mirrors STORAGE_KEY in `stores/settings-store.ts`. The headless task can't
 // import the Zustand store (would pull in React) so we read AsyncStorage
 // directly. Keep this in sync if the store key ever changes.
 const SETTINGS_STORAGE_KEY = 'webmail:settings:v1';
+// Mirrors the persist name in `stores/account-store.ts`. We use it to find
+// the user's active account at the end of the headless task so we can leave
+// the jmapClient singleton in a state consistent with what the UI expects
+// when the app resumes.
+const ACCOUNT_REGISTRY_KEY = 'account-registry';
 
 interface PushPersistedSettings {
   emailNotificationsEnabled?: boolean;
@@ -41,76 +50,151 @@ interface ShowNotificationOptions {
   emailId: string;
   threadId: string;
   subject?: string;
+  accountId: string;
 }
 
 interface BulwarkFcmNative {
   showNotification(opts: ShowNotificationOptions): Promise<void>;
 }
 
+// The relay forwards each JMAP push to FCM tagged with the deviceClientId it
+// received the push on (the URL slot from createPushSubscription). The exact
+// key the relay uses isn't part of any client-controlled contract, so rather
+// than guessing a field name we scan all string values in the data payload
+// and look for one that matches a deviceClientId we've registered locally.
+// Returns null if nothing matches (e.g. legacy relay payload format) so the
+// caller falls back to iterating every known account.
+async function identifyAccountFromFcmData(
+  data: unknown,
+  accountIds: string[],
+): Promise<string | null> {
+  if (!data || typeof data !== 'object') return null;
+
+  const reverseMap = new Map<string, string>();
+  for (const accountId of accountIds) {
+    const dcid = await AsyncStorage.getItem(deviceClientIdKey(accountId));
+    if (dcid) reverseMap.set(dcid, accountId);
+  }
+  if (reverseMap.size === 0) return null;
+
+  for (const value of Object.values(data as Record<string, unknown>)) {
+    if (typeof value === 'string') {
+      const match = reverseMap.get(value);
+      if (match) return match;
+    }
+  }
+  return null;
+}
+
+// Read the persisted active account directly from AsyncStorage (Zustand's
+// persist middleware stores the JSON-serialised state under its `name`).
+async function readActiveAccountId(): Promise<string | null> {
+  try {
+    const raw = await AsyncStorage.getItem(ACCOUNT_REGISTRY_KEY);
+    if (!raw) return null;
+    const parsed = JSON.parse(raw) as { state?: { activeAccountId?: string | null } };
+    return parsed.state?.activeAccountId ?? null;
+  } catch {
+    return null;
+  }
+}
+
 // Fired by BulwarkPushTaskService when a data FCM message arrives. Runs in a
 // short-lived headless JS runtime - keep it fast, catch all errors, and always
 // resolve so the native service can release its wake lock.
-export async function pushBackgroundTask(_data: unknown): Promise<void> {
+export async function pushBackgroundTask(data: unknown): Promise<void> {
+  let activeAccountId: string | null = null;
   try {
     if (!(await emailNotificationsAllowed())) return;
 
-    const accountId = await AsyncStorage.getItem(PUSH_ACCOUNT_ID_KEY);
-    if (!accountId) return;
+    await migrateLegacyPushKeys();
 
-    const loaded = await jmapClient.loadAccount(accountId);
-    if (!loaded) return;
+    const accountIds = await readPushAccountIds();
+    if (accountIds.length === 0) return;
 
-    const mailboxes = await getMailboxes();
-    const inbox = mailboxes.find((m) => m.role === 'inbox');
-    if (!inbox) return;
+    activeAccountId = await readActiveAccountId();
 
-    const { ids } = await queryEmails(inbox.id, {
-      filter: { notKeyword: '$seen' },
-      limit: 1,
-    });
-    if (ids.length === 0) return;
+    const matched = await identifyAccountFromFcmData(data, accountIds);
+    const accountsToCheck = matched ? [matched] : accountIds;
 
-    const emailId = ids[0];
-    const previouslyNotified = await AsyncStorage.getItem(LAST_NOTIFIED_EMAIL_ID_KEY);
-    if (previouslyNotified === emailId) return;
-
-    const [email] = await getEmails([emailId]);
-    if (!email) return;
-
-    const from = email.from?.[0];
-    const name = from?.name ?? '';
-    const address = from?.email ?? '';
-    const title = name || address || 'New mail';
-    const body = email.subject || '(no subject)';
-    const initials = getEmailInitials(name, address);
-    const bgColorHex = hslToHex(generateEmailAvatarColor(name, address));
-    const faviconDomain = getFaviconDomain(address);
-    const iconUrl = faviconDomain ? getFaviconUrl(faviconDomain) : undefined;
-
-    const native = NativeModules.BulwarkFcm as BulwarkFcmNative | undefined;
-    if (!native?.showNotification) return;
-
-    await native.showNotification({
-      notificationId: `mail:${emailId}`,
-      title,
-      body,
-      initials,
-      bgColorHex,
-      iconUrl,
-      emailId,
-      threadId: email.threadId,
-      subject: email.subject ?? undefined,
-    });
-
-    await AsyncStorage.setItem(LAST_NOTIFIED_EMAIL_ID_KEY, emailId);
+    for (const accountId of accountsToCheck) {
+      try {
+        await processAccountForPush(accountId);
+      } catch (err) {
+        console.warn(
+          '[push] background check failed for account',
+          accountId,
+          err instanceof Error ? err.message : err,
+        );
+      }
+    }
   } catch (error) {
     console.warn(
       '[push] background task failed:',
       error instanceof Error ? error.message : error,
     );
+  } finally {
+    // Leave the singleton bound to the user's active account so the UI sees
+    // a consistent jmapClient state when the app resumes. Without this, the
+    // last account processed above would remain loaded and the UI's cached
+    // email-store data would not match what the next JMAP request returns.
+    if (activeAccountId) {
+      await jmapClient.loadAccount(activeAccountId).catch(() => undefined);
+    }
   }
 }
 
+async function processAccountForPush(accountId: string): Promise<void> {
+  const loaded = await jmapClient.loadAccount(accountId);
+  if (!loaded) return;
+
+  const mailboxes = await getMailboxes();
+  const inbox = mailboxes.find((m) => m.role === 'inbox');
+  if (!inbox) return;
+
+  const { ids } = await queryEmails(inbox.id, {
+    filter: { notKeyword: '$seen' },
+    limit: 1,
+  });
+  if (ids.length === 0) return;
+
+  const emailId = ids[0];
+  const lastKey = lastNotifiedKey(accountId);
+  const previouslyNotified = await AsyncStorage.getItem(lastKey);
+  if (previouslyNotified === emailId) return;
+
+  const [email] = await getEmails([emailId]);
+  if (!email) return;
+
+  const from = email.from?.[0];
+  const name = from?.name ?? '';
+  const address = from?.email ?? '';
+  const title = name || address || 'New mail';
+  const body = email.subject || '(no subject)';
+  const initials = getEmailInitials(name, address);
+  const bgColorHex = hslToHex(generateEmailAvatarColor(name, address));
+  const faviconDomain = getFaviconDomain(address);
+  const iconUrl = faviconDomain ? getFaviconUrl(faviconDomain) : undefined;
+
+  const native = NativeModules.BulwarkFcm as BulwarkFcmNative | undefined;
+  if (!native?.showNotification) return;
+
+  await native.showNotification({
+    notificationId: `mail:${emailId}`,
+    title,
+    body,
+    initials,
+    bgColorHex,
+    iconUrl,
+    emailId,
+    threadId: email.threadId,
+    subject: email.subject ?? undefined,
+    accountId,
+  });
+
+  await AsyncStorage.setItem(lastKey, emailId);
+}
+
 function hslToHex(hsl: string): string {
   const match = hsl.match(/hsl\(\s*(\d+)\s*,\s*(\d+)%\s*,\s*(\d+)%\s*\)/);
   if (!match) return '#2563eb';

src/lib/push-notifications.ts

@@ -11,12 +11,88 @@ import { jmapClient } from '../api/jmap-client';
 import { generateAccountId } from './account-utils';
 
 // Persist identifiers across launches so we reuse the same JMAP subscription
-// after app restarts. deviceClientId also routes to the relay slot.
-const DEVICE_CLIENT_ID_KEY = 'push:deviceClientId:v1';
-const SUBSCRIPTION_ID_KEY = 'push:subscriptionId:v1';
+// after app restarts. Each account gets its own deviceClientId so the hosted
+// relay can distinguish per-account pushes via the URL slot it forwards.
 const RELAY_BASE_URL_KEY = 'push:relayBaseUrl:v1';
-const PUSH_ACCOUNT_ID_KEY = 'push:accountId:v1';
-const LAST_NOTIFIED_EMAIL_ID_KEY = 'push:lastNotifiedEmailId:v1';
+const PUSH_ACCOUNT_IDS_KEY = 'push:accountIds:v1';
+const DEVICE_CLIENT_ID_PREFIX = 'push:deviceClientId:v2:';
+const SUBSCRIPTION_ID_PREFIX = 'push:subscriptionId:v2:';
+export const LAST_NOTIFIED_EMAIL_ID_PREFIX = 'push:lastNotifiedEmailId:v2:';
+
+// Legacy single-account keys (pre-multi-account). Migrated lazily on the next
+// setupPushNotifications / pushBackgroundTask call, then deleted.
+const LEGACY_DEVICE_CLIENT_ID_KEY = 'push:deviceClientId:v1';
+const LEGACY_SUBSCRIPTION_ID_KEY = 'push:subscriptionId:v1';
+const LEGACY_PUSH_ACCOUNT_ID_KEY = 'push:accountId:v1';
+const LEGACY_LAST_NOTIFIED_EMAIL_ID_KEY = 'push:lastNotifiedEmailId:v1';
+
+export function deviceClientIdKey(accountId: string): string {
+  return DEVICE_CLIENT_ID_PREFIX + accountId;
+}
+
+function subscriptionIdKey(accountId: string): string {
+  return SUBSCRIPTION_ID_PREFIX + accountId;
+}
+
+export function lastNotifiedKey(accountId: string): string {
+  return LAST_NOTIFIED_EMAIL_ID_PREFIX + accountId;
+}
+
+export async function readPushAccountIds(): Promise<string[]> {
+  const raw = await AsyncStorage.getItem(PUSH_ACCOUNT_IDS_KEY);
+  if (!raw) return [];
+  try {
+    const parsed = JSON.parse(raw);
+    if (!Array.isArray(parsed)) return [];
+    return parsed.filter((s): s is string => typeof s === 'string');
+  } catch {
+    return [];
+  }
+}
+
+async function writePushAccountIds(ids: string[]): Promise<void> {
+  const deduped = Array.from(new Set(ids));
+  if (deduped.length === 0) {
+    await AsyncStorage.removeItem(PUSH_ACCOUNT_IDS_KEY);
+  } else {
+    await AsyncStorage.setItem(PUSH_ACCOUNT_IDS_KEY, JSON.stringify(deduped));
+  }
+}
+
+// One-shot migration from the pre-multi-account schema. If the legacy
+// PUSH_ACCOUNT_ID_KEY exists, treat that account as the only pre-existing
+// setup: reuse the legacy deviceClientId and JMAP subscription id under
+// the new per-account keys so the user doesn't lose push on upgrade.
+export async function migrateLegacyPushKeys(): Promise<void> {
+  const legacyAccountId = await AsyncStorage.getItem(LEGACY_PUSH_ACCOUNT_ID_KEY);
+  if (!legacyAccountId) return;
+
+  const legacyDcid = await AsyncStorage.getItem(LEGACY_DEVICE_CLIENT_ID_KEY);
+  const legacySubId = await AsyncStorage.getItem(LEGACY_SUBSCRIPTION_ID_KEY);
+  const legacyLastId = await AsyncStorage.getItem(LEGACY_LAST_NOTIFIED_EMAIL_ID_KEY);
+
+  if (legacyDcid) {
+    await AsyncStorage.setItem(deviceClientIdKey(legacyAccountId), legacyDcid);
+  }
+  if (legacySubId) {
+    await AsyncStorage.setItem(subscriptionIdKey(legacyAccountId), legacySubId);
+  }
+  if (legacyLastId) {
+    await AsyncStorage.setItem(lastNotifiedKey(legacyAccountId), legacyLastId);
+  }
+
+  const ids = await readPushAccountIds();
+  if (!ids.includes(legacyAccountId)) {
+    await writePushAccountIds([...ids, legacyAccountId]);
+  }
+
+  await AsyncStorage.multiRemove([
+    LEGACY_PUSH_ACCOUNT_ID_KEY,
+    LEGACY_DEVICE_CLIENT_ID_KEY,
+    LEGACY_SUBSCRIPTION_ID_KEY,
+    LEGACY_LAST_NOTIFIED_EMAIL_ID_KEY,
+  ]);
+}
 
 // Hosted relay so users don't need to run their own Firebase project. The
 // relay only ever sees FCM tokens + JMAP state-id hashes - no mail content.
@@ -72,11 +148,12 @@ function randomClientId(): string {
   return Array.from(bytes, (b) => b.toString(16).padStart(2, '0')).join('');
 }
 
-async function getOrCreateDeviceClientId(): Promise<string> {
-  const existing = await AsyncStorage.getItem(DEVICE_CLIENT_ID_KEY);
+async function getOrCreateDeviceClientId(accountId: string): Promise<string> {
+  const key = deviceClientIdKey(accountId);
+  const existing = await AsyncStorage.getItem(key);
   if (existing) return existing;
   const next = randomClientId();
-  await AsyncStorage.setItem(DEVICE_CLIENT_ID_KEY, next);
+  await AsyncStorage.setItem(key, next);
   return next;
 }
 
@@ -184,20 +261,24 @@ export async function setupPushNotifications(
   const fcmToken = await native.getToken();
   if (!fcmToken) throw new Error('FCM token unavailable');
 
-  const deviceClientId = await getOrCreateDeviceClientId();
-  await setStoredRelayBaseUrl(relayBaseUrl);
-
-  // Persist the account id so the background push task can reload credentials
-  // from SecureStore without the main app being running.
+  // setupPushNotifications operates on the currently-loaded jmapClient. We
+  // need its username/serverUrl up-front so we can key per-account state.
   const username = jmapClient.username;
   const serverUrl = jmapClient.serverUrl;
-  if (username && serverUrl) {
-    await AsyncStorage.setItem(
-      PUSH_ACCOUNT_ID_KEY,
-      generateAccountId(username, serverUrl),
-    );
+  if (!username || !serverUrl) {
+    throw new Error('No account loaded - cannot set up push');
   }
+  const accountId = generateAccountId(username, serverUrl);
 
+  await migrateLegacyPushKeys();
+
+  const deviceClientId = await getOrCreateDeviceClientId(accountId);
+  await setStoredRelayBaseUrl(relayBaseUrl);
+
+  // Register this account's device-client-id with the relay. Multiple
+  // accounts on the same device end up as separate registrations sharing
+  // one fcmToken - the relay forwards each push individually so the headless
+  // task can identify the source account via the FCM data payload.
   await registerWithRelay({
     relayBaseUrl,
     subscriptionId: deviceClientId,
@@ -208,26 +289,31 @@ export async function setupPushNotifications(
   // Reuse the previous JMAP subscription when the server still has it, but
   // push the expiry forward so it doesn't time out before the next app start.
   const existingSubs = await listPushSubscriptions().catch(() => []);
-  const storedServerId = await AsyncStorage.getItem(SUBSCRIPTION_ID_KEY);
+  const subKey = subscriptionIdKey(accountId);
+  const storedServerId = await AsyncStorage.getItem(subKey);
   if (storedServerId) {
     const match = existingSubs.find((s) => s.id === storedServerId);
     if (match) {
       const refreshed = await refreshSubscriptionExpires(match);
       if (refreshed) {
+        await addPushAccountId(accountId);
         return { subscriptionId: storedServerId, verified: true };
       }
       // Server rejected the refresh (likely the subscription was already
       // deleted server-side) - drop the stale id and recreate below.
       await destroyPushSubscription(storedServerId).catch(() => undefined);
     }
-    await AsyncStorage.removeItem(SUBSCRIPTION_ID_KEY);
+    await AsyncStorage.removeItem(subKey);
   }
 
-  // Reap any leftover Stalwart subscriptions still bound to this device.
-  // These pile up when a previous enable attempt failed mid-flow (verify
-  // race, network blip, app killed). Stalwart per-account rate-limits
-  // PushVerification posts, so leaving stragglers around blocks the new
-  // one's verification - the symptom is a confusing "code does not match".
+  // Reap any leftover Stalwart subscriptions still bound to this account's
+  // deviceClientId. These pile up when a previous enable attempt failed
+  // mid-flow (verify race, network blip, app killed). Stalwart per-account
+  // rate-limits PushVerification posts, so leaving stragglers around blocks
+  // the new one's verification - the symptom is a confusing "code does not
+  // match". Only reap matches for THIS account's deviceClientId; other
+  // accounts' subscriptions on this server (rare but possible if the same
+  // JMAP server backs multiple accounts) must be left alone.
   const stragglers = existingSubs.filter(
     (s) => s.deviceClientId === deviceClientId && s.id !== storedServerId,
   );
@@ -245,11 +331,19 @@ export async function setupPushNotifications(
   const verificationCode = await pollVerificationCode(relayBaseUrl, deviceClientId);
   await verifyPushSubscription(serverAssignedId, verificationCode);
 
-  await AsyncStorage.setItem(SUBSCRIPTION_ID_KEY, serverAssignedId);
+  await AsyncStorage.setItem(subKey, serverAssignedId);
+  await addPushAccountId(accountId);
 
   return { subscriptionId: serverAssignedId, verified: true };
 }
 
+async function addPushAccountId(accountId: string): Promise<void> {
+  const ids = await readPushAccountIds();
+  if (!ids.includes(accountId)) {
+    await writePushAccountIds([...ids, accountId]);
+  }
+}
+
 // Push the subscription's expires forward when it's getting close to the
 // server's ceiling. Returns false if the server rejects the update, which the
 // caller treats as "recreate".
@@ -273,28 +367,92 @@ async function refreshSubscriptionExpires(
   }
 }
 
+async function deregisterFromRelay(
+  relayBaseUrl: string,
+  deviceClientId: string,
+): Promise<void> {
+  await fetch(
+    buildRelayUrl(relayBaseUrl, `/api/push/register/${encodeURIComponent(deviceClientId)}`),
+    { method: 'DELETE' },
+  ).catch(() => undefined);
+}
+
 /**
- * Tear down push on logout / disable. Removes the server-side JMAP
- * subscription, tells the relay to drop the mapping, and clears the local
- * FCM token. Never throws - callers treat teardown as best effort.
+ * Tear down push for a single account. Destroys that account's JMAP
+ * subscription (assumes the jmapClient is currently authenticated to that
+ * account; the active-account logout flow guarantees this) and tells the
+ * relay to drop its mapping. Other accounts' push setups are untouched.
+ *
+ * If no accounts have push left after removal, also deletes the FCM token
+ * so the device stops receiving FCM messages entirely. Never throws -
+ * callers treat teardown as best effort.
+ */
+export async function teardownPushNotificationsForAccount(
+  accountId: string,
+): Promise<void> {
+  await migrateLegacyPushKeys();
+
+  const subKey = subscriptionIdKey(accountId);
+  const storedSubId = await AsyncStorage.getItem(subKey);
+  const dcidKey = deviceClientIdKey(accountId);
+  const storedDcid = await AsyncStorage.getItem(dcidKey);
+  const relayBaseUrl = await getStoredRelayBaseUrl();
+
+  if (storedSubId) {
+    await destroyPushSubscription(storedSubId).catch(() => undefined);
+  }
+  if (relayBaseUrl && storedDcid) {
+    await deregisterFromRelay(relayBaseUrl, storedDcid);
+  }
+
+  await AsyncStorage.multiRemove([subKey, dcidKey, lastNotifiedKey(accountId)]);
+
+  const remaining = (await readPushAccountIds()).filter((id) => id !== accountId);
+  await writePushAccountIds(remaining);
+
+  // If this was the last account with push, kill the FCM token so the device
+  // truly goes silent. Otherwise the token stays alive so the remaining
+  // accounts keep receiving pushes.
+  if (remaining.length === 0) {
+    const native = getNative();
+    if (native) {
+      await native.deleteToken().catch(() => undefined);
+    }
+  }
+}
+
+/**
+ * Tear down push for ALL accounts on this device. Used by the logout-all
+ * flow; best-effort because we typically aren't authenticated to every
+ * account's JMAP server at the moment we need to call destroy on it. The
+ * FCM token is always deleted so no push gets through regardless.
  */
 export async function teardownPushNotifications(): Promise<void> {
-  const storedId = await AsyncStorage.getItem(SUBSCRIPTION_ID_KEY);
-  const relayBaseUrl = await getStoredRelayBaseUrl();
-  const deviceClientId = await AsyncStorage.getItem(DEVICE_CLIENT_ID_KEY);
+  await migrateLegacyPushKeys();
 
-  if (storedId) {
-    await destroyPushSubscription(storedId).catch(() => undefined);
-    await AsyncStorage.removeItem(SUBSCRIPTION_ID_KEY);
+  const accountIds = await readPushAccountIds();
+  const relayBaseUrl = await getStoredRelayBaseUrl();
+
+  for (const accountId of accountIds) {
+    const subKey = subscriptionIdKey(accountId);
+    const dcidKey = deviceClientIdKey(accountId);
+    const storedSubId = await AsyncStorage.getItem(subKey);
+    const storedDcid = await AsyncStorage.getItem(dcidKey);
+
+    if (storedSubId) {
+      // Will only succeed if the jmapClient happens to be authenticated to
+      // this account right now. We don't switch the client to attempt each
+      // one; the subscription will expire server-side instead (90-day TTL).
+      await destroyPushSubscription(storedSubId).catch(() => undefined);
+    }
+    if (relayBaseUrl && storedDcid) {
+      await deregisterFromRelay(relayBaseUrl, storedDcid);
+    }
+    await AsyncStorage.multiRemove([subKey, dcidKey, lastNotifiedKey(accountId)]);
   }
-  if (relayBaseUrl && deviceClientId) {
-    await fetch(
-      buildRelayUrl(relayBaseUrl, `/api/push/register/${encodeURIComponent(deviceClientId)}`),
-      { method: 'DELETE' },
-    ).catch(() => undefined);
-  }
-  await AsyncStorage.removeItem(PUSH_ACCOUNT_ID_KEY);
-  await AsyncStorage.removeItem(LAST_NOTIFIED_EMAIL_ID_KEY);
+
+  await AsyncStorage.removeItem(PUSH_ACCOUNT_IDS_KEY);
+
   const native = getNative();
   if (native) {
     await native.deleteToken().catch(() => undefined);
@@ -327,6 +485,10 @@ export interface NotificationTapPayload {
   emailId: string;
   threadId: string;
   subject?: string;
+  // Identifies which logged-in account the notification was generated for.
+  // Optional for back-compat: older notifications already on the system tray
+  // won't carry this and will fall back to the active account on tap.
+  accountId?: string;
 }
 
 // Returns - and clears - any pending "notification tap" that launched the app

src/lib/recurrence-expansion.ts

@@ -11,7 +11,7 @@
  * on the client.
  */
 
-import { addDays, addMonths, addWeeks, addYears, format, parseISO } from 'date-fns';
+import { addDays, addMonths, addWeeks, addYears, differenceInCalendarDays, format, parseISO } from 'date-fns';
 import type { CalendarEvent, RecurrenceRule } from '../api/types';
 
 type NDay = { day: string; nthOfPeriod?: number };
@@ -60,6 +60,10 @@ export function expandRecurringEvents(
   return result;
 }
 
+function occurrenceDateKey(master: CalendarEvent, date: Date): string {
+  return master.showWithoutTime ? format(date, 'yyyy-MM-dd') : date.toISOString();
+}
+
 function expandEvent(
   master: CalendarEvent,
   rangeStart: Date,
@@ -73,13 +77,23 @@ function expandEvent(
   const occurrences: CalendarEvent[] = [];
   const seenDates = new Set<string>();
 
+  // RFC 8984 §4.3.3: occurrences produced by excludedRecurrenceRules
+  // (iCalendar EXRULE) are removed from the recurrence set.
+  const excludedDates = new Set<string>();
+  for (const exRule of master.excludedRecurrenceRules || []) {
+    // includeStartDate=false: "the series start is always an occurrence"
+    // applies to recurrence rules, not to exclusion rules.
+    for (const date of generateDates(eventStart, exRule, rangeStart, rangeEnd, false)) {
+      excludedDates.add(occurrenceDateKey(master, date));
+    }
+  }
+
   for (const rule of rules) {
     const dates = generateDates(eventStart, rule, rangeStart, rangeEnd);
     for (const date of dates) {
-      const dateKey = master.showWithoutTime
-        ? format(date, 'yyyy-MM-dd')
-        : date.toISOString();
+      const dateKey = occurrenceDateKey(master, date);
 
+      if (excludedDates.has(dateKey)) continue;
       if (seenDates.has(dateKey)) continue;
       seenDates.add(dateKey);
 
@@ -104,9 +118,9 @@ function expandEvent(
     if (isNaN(overrideDate.getTime())) continue;
     if (overrideDate < rangeStart || overrideDate >= rangeEnd) continue;
 
-    const dateKey = master.showWithoutTime
-      ? format(overrideDate, 'yyyy-MM-dd')
-      : overrideDate.toISOString();
+    // Overrides take precedence over excludedRecurrenceRules (they re-add
+    // a concrete instance), so only dedupe against already-generated dates.
+    const dateKey = occurrenceDateKey(master, overrideDate);
     if (seenDates.has(dateKey)) continue;
     seenDates.add(dateKey);
 
@@ -116,6 +130,65 @@ function expandEvent(
   return occurrences;
 }
 
+// Cache Intl formatters per IANA timezone id — constructing them is expensive
+// and expansion runs over hundreds of occurrences. `null` marks ids the
+// runtime rejected so we don't retry them.
+const tzFormatterCache = new Map<string, Intl.DateTimeFormat | null>();
+
+function getTzFormatter(timeZone: string): Intl.DateTimeFormat | null {
+  let formatter = tzFormatterCache.get(timeZone);
+  if (formatter === undefined) {
+    try {
+      formatter = new Intl.DateTimeFormat('en-CA', {
+        timeZone,
+        year: 'numeric',
+        month: '2-digit',
+        day: '2-digit',
+        hour: '2-digit',
+        minute: '2-digit',
+        second: '2-digit',
+        hour12: false,
+      });
+    } catch {
+      formatter = null;
+    }
+    tzFormatterCache.set(timeZone, formatter);
+  }
+  return formatter;
+}
+
+/** The wall-clock reading of `instant` in the formatter's zone, re-encoded as a UTC timestamp. */
+function wallClockAsUtcTimestamp(formatter: Intl.DateTimeFormat, instant: number): number {
+  const map: Record<string, string> = {};
+  for (const part of formatter.formatToParts(new Date(instant))) {
+    if (part.type !== 'literal') map[part.type] = part.value;
+  }
+  const hour = map.hour === '24' ? 0 : Number(map.hour);
+  return Date.UTC(
+    Number(map.year), Number(map.month) - 1, Number(map.day),
+    hour, Number(map.minute), Number(map.second),
+  );
+}
+
+/**
+ * Interpret the wall-clock fields of `wall` as a local time in `timeZone`
+ * and return the corresponding UTC instant. Two fixup iterations converge
+ * for all real offsets, including across DST transitions.
+ */
+function zonedWallTimeToUtc(wall: Date, timeZone: string): Date | null {
+  const formatter = getTzFormatter(timeZone);
+  if (!formatter) return null;
+  const wallAsUtc = Date.UTC(
+    wall.getFullYear(), wall.getMonth(), wall.getDate(),
+    wall.getHours(), wall.getMinutes(), wall.getSeconds(),
+  );
+  let guess = wallAsUtc;
+  for (let i = 0; i < 2; i++) {
+    guess = wallAsUtc - (wallClockAsUtcTimestamp(formatter, guess) - guess);
+  }
+  return new Date(guess);
+}
+
 function createOccurrence(
   master: CalendarEvent,
   date: Date,
@@ -130,16 +203,33 @@ function createOccurrence(
   // getEventEndDate return the occurrence times rather than the master's.
   let utcStart: string | undefined;
   let utcEnd: string | undefined;
-  if (!master.showWithoutTime && master.utcStart && master.start) {
-    const masterLocal = parseISO(master.start);
-    const masterUtc = parseISO(master.utcStart);
-    const offsetMs = masterUtc.getTime() - masterLocal.getTime();
-    utcStart = new Date(date.getTime() + offsetMs).toISOString();
+  if (!master.showWithoutTime) {
+    let durationMs: number | null = null;
+    if (master.utcStart && master.utcEnd) {
+      const ms = parseISO(master.utcEnd).getTime() - parseISO(master.utcStart).getTime();
+      if (!isNaN(ms)) durationMs = ms;
+    }
 
-    if (master.utcEnd) {
-      const masterUtcEnd = parseISO(master.utcEnd);
-      const durationMs = masterUtcEnd.getTime() - masterUtc.getTime();
-      utcEnd = new Date(date.getTime() + offsetMs + durationMs).toISOString();
+    // Convert the occurrence's wall time using the event's own timezone, so
+    // occurrences on the other side of a DST transition in that zone keep
+    // their wall time. Reusing the master's fixed UTC offset (the fallback
+    // below) would shift them by the DST delta.
+    const zoned = master.timeZone ? zonedWallTimeToUtc(date, master.timeZone) : null;
+    if (zoned) {
+      utcStart = zoned.toISOString();
+      if (durationMs !== null) {
+        utcEnd = new Date(zoned.getTime() + durationMs).toISOString();
+      }
+    } else if (master.utcStart && master.start) {
+      // Floating events (or an unrecognized timezone id): keep the master's
+      // offset, which by definition doesn't vary.
+      const masterLocal = parseISO(master.start);
+      const masterUtc = parseISO(master.utcStart);
+      const offsetMs = masterUtc.getTime() - masterLocal.getTime();
+      utcStart = new Date(date.getTime() + offsetMs).toISOString();
+      if (durationMs !== null) {
+        utcEnd = new Date(date.getTime() + offsetMs + durationMs).toISOString();
+      }
     }
   }
 
@@ -207,6 +297,7 @@ function generateDates(
   rawRule: RecurrenceRule,
   rangeStart: Date,
   rangeEnd: Date,
+  includeStartDate = true,
 ): Date[] {
   const rule = addImplicitByX(rawRule, eventStart);
   const dates: Date[] = [];
@@ -214,21 +305,34 @@ function generateDates(
   const countLimit = rule.count || Infinity;
   const until = rule.until ? parseISO(rule.until) : null;
   let totalCount = 0;
-  let current = new Date(eventStart);
+  // Without a `count` limit we can jump straight to the period containing
+  // the visible range. With one, every occurrence since the series start
+  // must be generated so it counts against `count`.
+  let current = rule.count
+    ? new Date(eventStart)
+    : fastForwardToRange(eventStart, rule.frequency, interval, rangeStart);
 
   const maxIterations = 2000;
+  // Cap on *emitted* (in-range) dates. This must not count occurrences
+  // before rangeStart, otherwise a series started long ago (e.g. a daily
+  // event from two years back) exhausts the budget before reaching the
+  // visible range and silently renders nothing.
   const maxOccurrences = 500;
   let iterations = 0;
 
   while (iterations++ < maxIterations) {
-    if (totalCount >= countLimit || totalCount >= maxOccurrences) break;
+    if (totalCount >= countLimit || dates.length >= maxOccurrences) break;
     if (until && current > until) break;
-    if (
-      current >= rangeEnd
-      && rule.frequency !== 'yearly'
-      && rule.frequency !== 'monthly'
-      && rule.frequency !== 'weekly'
-    ) break;
+    // Stop once no candidate in this or a later period can fall before
+    // rangeEnd. Monthly/yearly candidates may precede the period anchor
+    // within the same month/year, so floor the anchor before comparing.
+    if (rule.frequency === 'monthly') {
+      if (new Date(current.getFullYear(), current.getMonth(), 1) >= rangeEnd) break;
+    } else if (rule.frequency === 'yearly') {
+      if (new Date(current.getFullYear(), 0, 1) >= rangeEnd) break;
+    } else if (current >= rangeEnd) {
+      break;
+    }
 
     const candidates = generateCandidatesForPeriod(current, rule, eventStart);
 
@@ -238,7 +342,7 @@ function generateDates(
 
     for (const d of filtered) {
       if (until && d > until) break;
-      if (totalCount >= countLimit || totalCount >= maxOccurrences) break;
+      if (totalCount >= countLimit || dates.length >= maxOccurrences) break;
 
       // Spec rule 4: eliminate dates before event start
       if (d < eventStart) continue;
@@ -250,7 +354,7 @@ function generateDates(
       if (d >= rangeEnd) break;
     }
 
-    if (totalCount >= countLimit || totalCount >= maxOccurrences) break;
+    if (totalCount >= countLimit || dates.length >= maxOccurrences) break;
 
     current = advancePeriod(current, rule.frequency, interval);
     if (current <= eventStart && iterations === 1) {
@@ -259,7 +363,7 @@ function generateDates(
   }
 
   // Spec rule 1: the start date-time is ALWAYS the first occurrence.
-  if (dates.length > 0 && dates[0].getTime() !== eventStart.getTime()) {
+  if (includeStartDate && dates.length > 0 && dates[0].getTime() !== eventStart.getTime()) {
     if (eventStart >= rangeStart && eventStart < rangeEnd) {
       if (!dates.some((d) => d.getTime() === eventStart.getTime())) {
         dates.unshift(eventStart);
@@ -505,6 +609,66 @@ function advancePeriod(
   }
 }
 
+// ─── Fast-forward to the visible range ───────────────────
+// Jump to the period just before the visible range in O(1), so long-running
+// series don't burn the iteration budget on years of out-of-range periods.
+// Only valid for rules without `count` (counted rules must enumerate every
+// occurrence from the series start).
+function fastForwardToRange(
+  eventStart: Date,
+  frequency: RecurrenceRule['frequency'],
+  interval: number,
+  rangeStart: Date,
+): Date {
+  if (eventStart >= rangeStart) return new Date(eventStart);
+
+  let periods: number;
+  switch (frequency) {
+    case 'secondly':
+      periods = Math.floor((rangeStart.getTime() - eventStart.getTime()) / (1000 * interval));
+      break;
+    case 'minutely':
+      periods = Math.floor((rangeStart.getTime() - eventStart.getTime()) / (60000 * interval));
+      break;
+    case 'hourly':
+      periods = Math.floor((rangeStart.getTime() - eventStart.getTime()) / (3600000 * interval));
+      break;
+    case 'daily':
+      periods = Math.floor(differenceInCalendarDays(rangeStart, eventStart) / interval);
+      break;
+    case 'weekly':
+      periods = Math.floor(differenceInCalendarDays(rangeStart, eventStart) / (7 * interval));
+      break;
+    case 'monthly': {
+      const months = (rangeStart.getFullYear() - eventStart.getFullYear()) * 12
+        + (rangeStart.getMonth() - eventStart.getMonth());
+      periods = Math.floor(months / interval);
+      break;
+    }
+    case 'yearly':
+      periods = Math.floor((rangeStart.getFullYear() - eventStart.getFullYear()) / interval);
+      break;
+    default:
+      return new Date(eventStart);
+  }
+
+  // Land one full period early so candidates inside the boundary period
+  // (which can precede the period anchor) are still generated.
+  periods = Math.max(0, periods - 1);
+  if (periods === 0) return new Date(eventStart);
+
+  switch (frequency) {
+    case 'secondly': return new Date(eventStart.getTime() + periods * interval * 1000);
+    case 'minutely': return new Date(eventStart.getTime() + periods * interval * 60000);
+    case 'hourly': return new Date(eventStart.getTime() + periods * interval * 3600000);
+    case 'daily': return addDays(eventStart, periods * interval);
+    case 'weekly': return addWeeks(eventStart, periods * interval);
+    case 'monthly': return addMonths(eventStart, periods * interval);
+    case 'yearly': return addYears(eventStart, periods * interval);
+    default: return new Date(eventStart);
+  }
+}
+
 function expandByDayInMonth(
   year: number,
   month: number,

src/lib/recurrence.ts

@@ -0,0 +1,246 @@
+/**
+ * Custom recurrence rule helpers for the event editor. Mobile port of
+ * webmail's components/calendar/recurrence-editor.tsx logic (rule detection,
+ * construction, and the human-readable summary).
+ */
+
+import { format } from 'date-fns';
+import type { RecurrenceRule } from '../api/types';
+
+export type EditorFrequency = 'daily' | 'weekly' | 'monthly' | 'yearly';
+export type MonthlyMode = 'day' | 'nth';
+export type EndsMode = 'never' | 'on' | 'after';
+
+export const EDITOR_FREQUENCIES: EditorFrequency[] = ['daily', 'weekly', 'monthly', 'yearly'];
+
+// JSCalendar weekday ids in display order (week starts Monday, matching the
+// firstDayOfWeek the built rules declare).
+export const WEEKDAYS: string[] = ['mo', 'tu', 'we', 'th', 'fr', 'sa', 'su'];
+const DAY_TO_REF_DATE: Record<string, number> = { mo: 1, tu: 2, we: 3, th: 4, fr: 5, sa: 6, su: 7 };
+export const INDEX_TO_DAY = ['su', 'mo', 'tu', 'we', 'th', 'fr', 'sa'];
+
+export const UNIT_LABELS: Record<EditorFrequency, string> = {
+  daily: 'days',
+  weekly: 'weeks',
+  monthly: 'months',
+  yearly: 'years',
+};
+
+// 2024-01-01 is a Monday — used to render weekday names via date-fns.
+export function weekdayName(day: string, style: 'long' | 'short' = 'long'): string {
+  const ref = new Date(2024, 0, DAY_TO_REF_DATE[day] ?? 1);
+  return format(ref, style === 'long' ? 'EEEE' : 'EEE');
+}
+
+export function monthName(month: number): string {
+  return format(new Date(2024, month - 1, 1), 'LLLL');
+}
+
+const NTH_LABELS: Record<number, string> = {
+  1: 'first',
+  2: 'second',
+  3: 'third',
+  4: 'fourth',
+  [-1]: 'last',
+};
+
+export function nthLabel(nth: number): string {
+  return NTH_LABELS[nth] ?? String(nth);
+}
+
+export function capitalize(s: string): string {
+  return s.charAt(0).toUpperCase() + s.slice(1);
+}
+
+/**
+ * Extract an "nth weekday" pattern from a rule, accepting both the
+ * byDay+nthOfPeriod encoding and the byDay+bySetPosition encoding.
+ */
+export function getNthDay(rule: RecurrenceRule): { day: string; nth: number } | null {
+  if (rule.byDay?.length === 1) {
+    const nd = rule.byDay[0];
+    if (nd.nthOfPeriod) return { day: nd.day, nth: nd.nthOfPeriod };
+    if (rule.bySetPosition?.length === 1) return { day: nd.day, nth: rule.bySetPosition[0] };
+  }
+  return null;
+}
+
+/**
+ * True when the rule is exactly what the plain Daily/Weekly/Monthly/Yearly
+ * dropdown presets produce, i.e. it needs no custom editor to represent.
+ */
+export function isSimpleRecurrenceRule(rule: RecurrenceRule): boolean {
+  return (
+    (EDITOR_FREQUENCIES as string[]).includes(rule.frequency) &&
+    (!rule.interval || rule.interval === 1) &&
+    !rule.byDay?.length &&
+    !rule.byMonthDay?.length &&
+    !rule.byMonth?.length &&
+    !rule.byYearDay?.length &&
+    !rule.byWeekNo?.length &&
+    !rule.bySetPosition?.length &&
+    !rule.count &&
+    !rule.until
+  );
+}
+
+/**
+ * Human-readable summary of a recurrence rule, e.g.
+ * "Every 2 months on the third Thursday · 12 occurrences".
+ * Returns null for frequencies the UI cannot describe (hourly etc.).
+ */
+export function buildRecurrenceSummary(rule: RecurrenceRule): string | null {
+  const interval = rule.interval || 1;
+  let base: string;
+  switch (rule.frequency) {
+    case 'daily':
+      base = interval > 1 ? `Every ${interval} days` : 'Daily';
+      break;
+    case 'weekly':
+      base = interval > 1 ? `Every ${interval} weeks` : 'Weekly';
+      break;
+    case 'monthly':
+      base = interval > 1 ? `Every ${interval} months` : 'Monthly';
+      break;
+    case 'yearly':
+      base = interval > 1 ? `Every ${interval} years` : 'Yearly';
+      break;
+    default:
+      return null;
+  }
+
+  const parts = [base];
+
+  if (rule.frequency === 'weekly' && rule.byDay?.length) {
+    const days = rule.byDay
+      .filter((d) => WEEKDAYS.includes(d.day))
+      .sort((a, b) => WEEKDAYS.indexOf(a.day) - WEEKDAYS.indexOf(b.day))
+      .map((d) => weekdayName(d.day, 'short'))
+      .join(', ');
+    if (days) parts.push(`on ${days}`);
+  }
+
+  if (rule.frequency === 'monthly' || rule.frequency === 'yearly') {
+    if (rule.frequency === 'yearly' && rule.byMonth?.length) {
+      const m = parseInt(rule.byMonth[0], 10);
+      if (m >= 1 && m <= 12) parts.push(`in ${monthName(m)}`);
+    }
+    const nthDay = getNthDay(rule);
+    if (nthDay) {
+      parts.push(`on the ${nthLabel(nthDay.nth)} ${weekdayName(nthDay.day)}`);
+    } else if (rule.byMonthDay?.length) {
+      parts.push(`on day ${rule.byMonthDay[0]}`);
+    }
+  }
+
+  let summary = parts.join(' ');
+  if (rule.count) {
+    summary += ` · ${rule.count} ${rule.count === 1 ? 'occurrence' : 'occurrences'}`;
+  } else if (rule.until) {
+    const d = new Date(rule.until);
+    if (!isNaN(d.getTime())) {
+      summary += ` · until ${format(d, 'MMM d, yyyy')}`;
+    }
+  }
+  return summary;
+}
+
+export interface RecurrenceEditorValue {
+  frequency: EditorFrequency;
+  interval: number;
+  weekDays: string[];
+  monthlyMode: MonthlyMode;
+  monthDay: number;
+  nth: number;
+  nthDay: string;
+  month: number;
+  endsMode: EndsMode;
+  untilDate: string; // yyyy-MM-dd
+  count: number;
+}
+
+/** Build the editor's initial state from an existing rule (or defaults). */
+export function editorValueFromRule(
+  rule: RecurrenceRule | null,
+  eventStart: Date,
+): RecurrenceEditorValue {
+  const startDay = INDEX_TO_DAY[eventStart.getDay()];
+  const nthDayInfo = rule ? getNthDay(rule) : null;
+
+  const weekDays = (() => {
+    if (rule?.frequency === 'weekly' && rule.byDay?.length) {
+      const days = rule.byDay.map((d) => d.day).filter((d) => WEEKDAYS.includes(d));
+      if (days.length) return days;
+    }
+    return [startDay];
+  })();
+
+  const monthFromRule = rule?.byMonth?.length ? parseInt(rule.byMonth[0], 10) : NaN;
+  const untilFromRule = (() => {
+    if (rule?.until) {
+      const d = new Date(rule.until);
+      if (!isNaN(d.getTime())) return format(d, 'yyyy-MM-dd');
+    }
+    const inAYear = new Date(eventStart);
+    inAYear.setFullYear(inAYear.getFullYear() + 1);
+    return format(inAYear, 'yyyy-MM-dd');
+  })();
+
+  return {
+    frequency: rule && (EDITOR_FREQUENCIES as string[]).includes(rule.frequency)
+      ? (rule.frequency as EditorFrequency)
+      : 'weekly',
+    interval: rule?.interval || 1,
+    weekDays,
+    monthlyMode: nthDayInfo ? 'nth' : 'day',
+    monthDay: rule?.byMonthDay?.[0] && rule.byMonthDay[0] >= 1 && rule.byMonthDay[0] <= 31
+      ? rule.byMonthDay[0]
+      : eventStart.getDate(),
+    nth: nthDayInfo && (nthDayInfo.nth === -1 || (nthDayInfo.nth >= 1 && nthDayInfo.nth <= 4))
+      ? nthDayInfo.nth
+      : Math.min(4, Math.floor((eventStart.getDate() - 1) / 7) + 1),
+    nthDay: nthDayInfo && WEEKDAYS.includes(nthDayInfo.day) ? nthDayInfo.day : startDay,
+    month: monthFromRule >= 1 && monthFromRule <= 12 ? monthFromRule : eventStart.getMonth() + 1,
+    endsMode: rule?.count ? 'after' : rule?.until ? 'on' : 'never',
+    untilDate: untilFromRule,
+    count: rule?.count ?? 12,
+  };
+}
+
+/** Build the JSCalendar rule the editor state describes. */
+export function buildRuleFromEditorValue(
+  value: RecurrenceEditorValue,
+  eventStart: Date,
+): RecurrenceRule {
+  const startDay = INDEX_TO_DAY[eventStart.getDay()];
+  const built: RecurrenceRule = {
+    '@type': 'RecurrenceRule',
+    frequency: value.frequency,
+    interval: Math.max(1, value.interval),
+    rscale: 'gregorian',
+    skip: 'omit',
+    firstDayOfWeek: 'mo',
+  };
+
+  if (value.endsMode === 'after') {
+    built.count = Math.max(1, value.count);
+  } else if (value.endsMode === 'on' && value.untilDate) {
+    built.until = `${value.untilDate}T23:59:59`;
+  }
+
+  if (value.frequency === 'weekly') {
+    const days = value.weekDays.length ? value.weekDays : [startDay];
+    built.byDay = WEEKDAYS.filter((d) => days.includes(d)).map((day) => ({ day }));
+  } else if (value.frequency === 'monthly' || value.frequency === 'yearly') {
+    if (value.monthlyMode === 'nth') {
+      built.byDay = [{ day: value.nthDay, nthOfPeriod: value.nth }];
+    } else {
+      built.byMonthDay = [Math.min(31, Math.max(1, value.monthDay))];
+    }
+    if (value.frequency === 'yearly') {
+      built.byMonth = [String(value.month)];
+    }
+  }
+
+  return built;
+}

src/lib/sha256.ts

@@ -0,0 +1,131 @@
+// Minimal SHA-256 implementation. Used to verify APK update downloads against
+// the checksum published in the GitHub release body — the JS runtime has no
+// built-in `crypto.subtle.digest` and we don't currently depend on
+// `expo-crypto`. Public-domain algorithm (FIPS 180-4); typical sub-second per
+// MB on a modern phone, which is fine for the rare update flow.
+
+const K = new Uint32Array([
+  0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1,
+  0x923f82a4, 0xab1c5ed5, 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
+  0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174, 0xe49b69c1, 0xefbe4786,
+  0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
+  0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147,
+  0x06ca6351, 0x14292967, 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
+  0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85, 0xa2bfe8a1, 0xa81a664b,
+  0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
+  0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a,
+  0x5b9cca4f, 0x682e6ff3, 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
+  0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2,
+]);
+
+function rotr(x: number, n: number): number {
+  return (x >>> n) | (x << (32 - n));
+}
+
+export class Sha256 {
+  private h = new Uint32Array([
+    0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a,
+    0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19,
+  ]);
+  private buffer = new Uint8Array(64);
+  private bufferLen = 0;
+  private byteCount = 0;
+
+  update(bytes: Uint8Array): void {
+    let i = 0;
+    this.byteCount += bytes.length;
+    while (i < bytes.length) {
+      const room = 64 - this.bufferLen;
+      const chunk = Math.min(room, bytes.length - i);
+      this.buffer.set(bytes.subarray(i, i + chunk), this.bufferLen);
+      this.bufferLen += chunk;
+      i += chunk;
+      if (this.bufferLen === 64) {
+        this.process(this.buffer);
+        this.bufferLen = 0;
+      }
+    }
+  }
+
+  digestHex(): string {
+    // Final block: append 0x80, pad with zeros, then 8-byte big-endian length.
+    const totalBits = this.byteCount * 8;
+    this.buffer[this.bufferLen++] = 0x80;
+    if (this.bufferLen > 56) {
+      while (this.bufferLen < 64) this.buffer[this.bufferLen++] = 0;
+      this.process(this.buffer);
+      this.bufferLen = 0;
+    }
+    while (this.bufferLen < 56) this.buffer[this.bufferLen++] = 0;
+    // 64-bit length, big-endian. We can't represent >2^53 - JS bitops are
+    // 32-bit, so split into hi/lo words.
+    const hi = Math.floor(totalBits / 0x100000000);
+    const lo = totalBits >>> 0;
+    this.buffer[56] = (hi >>> 24) & 0xff;
+    this.buffer[57] = (hi >>> 16) & 0xff;
+    this.buffer[58] = (hi >>> 8) & 0xff;
+    this.buffer[59] = hi & 0xff;
+    this.buffer[60] = (lo >>> 24) & 0xff;
+    this.buffer[61] = (lo >>> 16) & 0xff;
+    this.buffer[62] = (lo >>> 8) & 0xff;
+    this.buffer[63] = lo & 0xff;
+    this.process(this.buffer);
+
+    let out = '';
+    for (let i = 0; i < 8; i++) {
+      out += this.h[i].toString(16).padStart(8, '0');
+    }
+    return out;
+  }
+
+  private process(block: Uint8Array): void {
+    const w = new Uint32Array(64);
+    for (let i = 0; i < 16; i++) {
+      w[i] =
+        (block[i * 4] << 24) |
+        (block[i * 4 + 1] << 16) |
+        (block[i * 4 + 2] << 8) |
+        block[i * 4 + 3];
+    }
+    for (let i = 16; i < 64; i++) {
+      const s0 = rotr(w[i - 15], 7) ^ rotr(w[i - 15], 18) ^ (w[i - 15] >>> 3);
+      const s1 = rotr(w[i - 2], 17) ^ rotr(w[i - 2], 19) ^ (w[i - 2] >>> 10);
+      w[i] = (w[i - 16] + s0 + w[i - 7] + s1) | 0;
+    }
+
+    let a = this.h[0], b = this.h[1], c = this.h[2], d = this.h[3];
+    let e = this.h[4], f = this.h[5], g = this.h[6], hh = this.h[7];
+
+    for (let i = 0; i < 64; i++) {
+      const S1 = rotr(e, 6) ^ rotr(e, 11) ^ rotr(e, 25);
+      const ch = (e & f) ^ (~e & g);
+      const temp1 = (hh + S1 + ch + K[i] + w[i]) | 0;
+      const S0 = rotr(a, 2) ^ rotr(a, 13) ^ rotr(a, 22);
+      const mj = (a & b) ^ (a & c) ^ (b & c);
+      const temp2 = (S0 + mj) | 0;
+      hh = g;
+      g = f;
+      f = e;
+      e = (d + temp1) | 0;
+      d = c;
+      c = b;
+      b = a;
+      a = (temp1 + temp2) | 0;
+    }
+
+    this.h[0] = (this.h[0] + a) | 0;
+    this.h[1] = (this.h[1] + b) | 0;
+    this.h[2] = (this.h[2] + c) | 0;
+    this.h[3] = (this.h[3] + d) | 0;
+    this.h[4] = (this.h[4] + e) | 0;
+    this.h[5] = (this.h[5] + f) | 0;
+    this.h[6] = (this.h[6] + g) | 0;
+    this.h[7] = (this.h[7] + hh) | 0;
+  }
+}
+
+export function sha256Hex(bytes: Uint8Array): string {
+  const h = new Sha256();
+  h.update(bytes);
+  return h.digestHex();
+}

src/lib/sieve/__tests__/external-rules.test.ts

@@ -0,0 +1,381 @@
+import { describe, it, expect } from 'vitest';
+import { readFileSync } from 'node:fs';
+import { join } from 'node:path';
+import { parseScript } from '../parser';
+import { generateScript } from '../generator';
+import type { FilterRule } from '../types';
+
+function makeBulwarkRule(overrides: Partial<FilterRule> = {}): FilterRule {
+  return {
+    id: 'bw-1',
+    name: 'Bulwark Rule',
+    enabled: true,
+    matchType: 'all',
+    conditions: [{ field: 'from', comparator: 'contains', value: 'test@example.com' }],
+    actions: [{ type: 'move', value: 'Archive' }],
+    stopProcessing: false,
+    ...overrides,
+  };
+}
+
+describe('external rule preservation (issue #201)', () => {
+  describe('parser - external rule recognition', () => {
+    it('parses a Roundcube-style rule with "# rule:[Name]" comment', () => {
+      const script = `require ["fileinto"];\n\n# rule:[Archive Newsletters]\nif header :contains "List-Id" "news" {\n    fileinto "Newsletters";\n}\n`;
+      const result = parseScript(script);
+
+      expect(result.isOpaque).toBe(false);
+      expect(result.rules).toHaveLength(1);
+      const rule = result.rules[0];
+      expect(rule.origin).toBe('external');
+      expect(rule.originLabel).toBe('Roundcube');
+      expect(rule.name).toBe('Archive Newsletters');
+      expect(rule.conditions[0]).toMatchObject({
+        field: 'header',
+        comparator: 'contains',
+        value: 'news',
+        headerName: 'List-Id',
+      });
+      expect(rule.actions[0]).toEqual({ type: 'move', value: 'Newsletters' });
+    });
+
+    it('labels rules near a Nextcloud marker comment', () => {
+      const script = `require ["fileinto"];\n\n# Nextcloud Mail - begin\nif header :contains "Subject" "invoice" {\n    fileinto "Finance";\n}\n# Nextcloud Mail - end\n`;
+      const result = parseScript(script);
+      expect(result.rules[0].originLabel).toBe('Nextcloud');
+    });
+
+    it('falls back to "External" label when no known marker is present', () => {
+      const script = `require ["fileinto"];\n\nif header :contains "From" "boss@corp.com" {\n    fileinto "Important";\n}\n`;
+      const result = parseScript(script);
+      expect(result.rules[0].originLabel).toBe('External');
+    });
+
+    it('parses anyof/allof conditions in external rules', () => {
+      const script = `require ["fileinto"];\n\nif anyof(header :contains "From" "a@x.com", header :contains "From" "b@x.com") {\n    fileinto "VIP";\n}\n`;
+      const result = parseScript(script);
+      expect(result.rules[0].matchType).toBe('any');
+      expect(result.rules[0].conditions).toHaveLength(2);
+    });
+
+    it('parses negated conditions (not header :is)', () => {
+      const script = `if not header :is "From" "spam@x.com" {\n    keep;\n}\n`;
+      const result = parseScript(script);
+      expect(result.rules[0].conditions[0]).toMatchObject({
+        field: 'from',
+        comparator: 'not_is',
+        value: 'spam@x.com',
+      });
+    });
+
+    it('marks unrecognized blocks as opaque but preserves their raw text', () => {
+      const script = `require ["relational"];\n\nif header :value "ge" :comparator "i;ascii-numeric" "X-Priority" ["3"] {\n    keep;\n}\n`;
+      const result = parseScript(script);
+      expect(result.isOpaque).toBe(false);
+      const rule = result.rules[0];
+      expect(rule.origin).toBe('opaque');
+      expect(rule.rawBlock).toContain('if header :value');
+    });
+
+    it('collects all external require tokens', () => {
+      const script = `require ["fileinto", "imap4flags", "body"];\n\nif header :is "Subject" "hi" { fileinto "A"; }\n`;
+      const result = parseScript(script);
+      expect(result.externalRequires).toEqual(expect.arrayContaining(['fileinto', 'imap4flags', 'body']));
+    });
+  });
+
+  describe('parser - mixed Bulwark + external', () => {
+    it('returns Bulwark rules from metadata and external rules from the rest', () => {
+      const bulwark = [makeBulwarkRule({ name: 'Bulwark A' })];
+      const bulwarkScript = generateScript(bulwark);
+      const mixedScript = `${bulwarkScript}\n# External appended by Nextcloud\nif header :contains "List-Id" "devs" {\n    fileinto "Dev";\n}\n`;
+
+      const result = parseScript(mixedScript);
+      expect(result.isOpaque).toBe(false);
+      expect(result.rules.length).toBeGreaterThanOrEqual(2);
+
+      const bulwarkParsed = result.rules.filter(r => !r.origin || r.origin === 'bulwark');
+      const externalParsed = result.rules.filter(r => r.origin === 'external');
+      expect(bulwarkParsed).toHaveLength(1);
+      expect(bulwarkParsed[0].name).toBe('Bulwark A');
+      expect(externalParsed).toHaveLength(1);
+      expect(externalParsed[0].originLabel).toBe('Nextcloud');
+    });
+
+    it('does not return Bulwark-emitted if-blocks as external duplicates', () => {
+      const bulwark = [makeBulwarkRule({ name: 'My Bulwark Rule' })];
+      const script = generateScript(bulwark);
+      const result = parseScript(script);
+
+      // Only the metadata-sourced rule, no duplicate "external" entry.
+      expect(result.rules).toHaveLength(1);
+      expect(result.rules[0].origin).toBeUndefined();
+    });
+
+    it('does not duplicate a Bulwark rule whose values contain literal braces', () => {
+      // Regression for an issue where a value like "Report Domain: {x}" caused
+      // parseIfBlockToRule's naive indexOf('{') to point inside the value
+      // instead of at the body, so the if-block fell back to an opaque rule
+      // that escaped the bulwark-name dedup filter.
+      const bulwark = [
+        makeBulwarkRule({
+          name: 'DMARC reports',
+          matchType: 'any',
+          conditions: [
+            { field: 'subject', comparator: 'contains', value: 'Report Domain: mydomain.com' },
+            { field: 'subject', comparator: 'contains', value: 'Report Domain: {mydomain.com}' },
+          ],
+          actions: [{ type: 'mark_read' }, { type: 'move', value: 'DMARC' }],
+        }),
+      ];
+      const script = generateScript(bulwark);
+      const result = parseScript(script);
+
+      expect(result.rules).toHaveLength(1);
+      expect(result.rules[0].origin).toBeUndefined();
+      expect(result.rules[0].name).toBe('DMARC reports');
+    });
+  });
+
+  describe('generator - external splice', () => {
+    it('appends external rawBlocks verbatim after Bulwark-managed output', () => {
+      const externalRule: FilterRule = {
+        id: 'ext-0',
+        name: 'External',
+        enabled: true,
+        matchType: 'all',
+        conditions: [{ field: 'header', comparator: 'contains', value: 'x', headerName: 'List-Id' }],
+        actions: [{ type: 'move', value: 'Lists' }],
+        stopProcessing: false,
+        origin: 'external',
+        originLabel: 'Nextcloud',
+        rawBlock: '# Nextcloud Mail\nif header :contains "List-Id" "x" {\n    fileinto "Lists";\n}\n',
+      };
+      const rules: FilterRule[] = [makeBulwarkRule(), externalRule];
+      const script = generateScript(rules);
+
+      expect(script).toContain('# Rule: Bulwark Rule');
+      expect(script).toContain('# Nextcloud Mail');
+      expect(script).toContain('# --- External rules (managed outside Bulwark) ---');
+      const bulwarkIdx = script.indexOf('# Rule: Bulwark Rule');
+      const externalIdx = script.indexOf('# Nextcloud Mail');
+      expect(bulwarkIdx).toBeLessThan(externalIdx);
+    });
+
+    it('unions external requires into the top-level require line', () => {
+      const script = generateScript([makeBulwarkRule()], undefined, {
+        externalRequires: ['fileinto', 'imap4flags', 'body'],
+      });
+      const requireLine = script.split('\n').find(l => l.startsWith('require'))!;
+      expect(requireLine).toContain('"fileinto"');
+      expect(requireLine).toContain('"imap4flags"');
+      expect(requireLine).toContain('"body"');
+    });
+
+    it('strips origin/rawBlock/originLabel from Bulwark rules when writing metadata', () => {
+      const bulwarkWithJunk: FilterRule = {
+        ...makeBulwarkRule(),
+        origin: 'bulwark',
+        originLabel: 'shouldnotbehere',
+        rawBlock: 'shouldnotbehere',
+      };
+      const script = generateScript([bulwarkWithJunk]);
+      const match = script.match(/@metadata:begin\n(.*)\n@metadata:end/);
+      const metadata = JSON.parse(match![1]);
+      expect(metadata.rules[0]).not.toHaveProperty('origin');
+      expect(metadata.rules[0]).not.toHaveProperty('originLabel');
+      expect(metadata.rules[0]).not.toHaveProperty('rawBlock');
+    });
+
+    it('never writes external rules into metadata', () => {
+      const ext: FilterRule = {
+        id: 'ext-0',
+        name: 'Ext',
+        enabled: true,
+        matchType: 'all',
+        conditions: [{ field: 'from', comparator: 'is', value: 'x@y' }],
+        actions: [{ type: 'keep' }],
+        stopProcessing: false,
+        origin: 'external',
+        rawBlock: '# ext\nif header :is "From" "x@y" { keep; }',
+      };
+      const script = generateScript([makeBulwarkRule(), ext]);
+      const match = script.match(/@metadata:begin\n(.*)\n@metadata:end/);
+      const metadata = JSON.parse(match![1]);
+      expect(metadata.rules).toHaveLength(1);
+      expect(metadata.rules[0].name).toBe('Bulwark Rule');
+    });
+  });
+
+  describe('fixture: mixed-origins.sieve', () => {
+    const fixture = readFileSync(
+      join(__dirname, 'fixtures', 'mixed-origins.sieve'),
+      'utf-8',
+    );
+
+    it('identifies Bulwark, Roundcube, Nextcloud, External, and opaque rules', () => {
+      const result = parseScript(fixture);
+
+      expect(result.isOpaque).toBe(false);
+      expect(result.vacation).toBeUndefined();
+
+      const byOrigin = {
+        bulwark: result.rules.filter(r => !r.origin || r.origin === 'bulwark'),
+        external: result.rules.filter(r => r.origin === 'external'),
+        opaque: result.rules.filter(r => r.origin === 'opaque'),
+      };
+
+      expect(byOrigin.bulwark).toHaveLength(2);
+      expect(byOrigin.external.length).toBeGreaterThanOrEqual(3);
+      expect(byOrigin.opaque).toHaveLength(1);
+
+      const labels = byOrigin.external.map(r => r.originLabel);
+      expect(labels).toContain('Roundcube');
+      expect(labels).toContain('Nextcloud');
+      expect(labels).toContain('External');
+
+      const opaqueRule = byOrigin.opaque[0];
+      expect(opaqueRule.rawBlock).toContain(':comparator "i;ascii-numeric"');
+    });
+
+    it('preserves unknown-Sieve content through save round-trip', () => {
+      const parsed = parseScript(fixture);
+      const regenerated = generateScript(parsed.rules, parsed.vacation, {
+        externalRequires: parsed.externalRequires,
+      });
+
+      // The unparseable construct must appear verbatim in the regenerated script.
+      expect(regenerated).toContain(':comparator "i;ascii-numeric"');
+      // Require tokens from the external content are preserved.
+      expect(regenerated).toContain('"relational"');
+      // Bulwark rules are still present.
+      expect(regenerated).toContain('# Rule: Archive newsletters');
+    });
+  });
+
+  describe('round-trip', () => {
+    it('preserves external rules through parse → generate → parse', () => {
+      const initial = `require ["fileinto", "imap4flags"];\n\n# rule:[VIP]\nif header :contains "From" "boss@company.com" {\n    fileinto "VIP";\n    addflag "\\\\Flagged";\n}\n\n# Nextcloud Mail - begin\nif header :contains "Subject" "invoice" {\n    fileinto "Finance";\n}\n# Nextcloud Mail - end\n`;
+
+      const firstParse = parseScript(initial);
+      expect(firstParse.rules).toHaveLength(2);
+
+      const regenerated = generateScript(firstParse.rules, firstParse.vacation, {
+        externalRequires: firstParse.externalRequires,
+      });
+      const secondParse = parseScript(regenerated);
+
+      expect(secondParse.rules).toHaveLength(2);
+      const names = secondParse.rules.map(r => r.name).sort();
+      expect(names).toContain('VIP');
+    });
+
+    it('does not destroy external rules when Bulwark regenerates after an edit', () => {
+      const initial = `${generateScript([makeBulwarkRule({ name: 'Mine' })])}\n# rule:[Untouchable]\nif header :is "X-Spam" "yes" {\n    discard;\n}\n`;
+
+      const parsed = parseScript(initial);
+      const externalBefore = parsed.rules.filter(r => r.origin === 'external');
+      expect(externalBefore).toHaveLength(1);
+
+      // Simulate a user edit - update the Bulwark rule name
+      const edited = parsed.rules.map(r => (r.origin === 'external' || r.origin === 'opaque' ? r : { ...r, name: 'Mine (edited)' }));
+      const regenerated = generateScript(edited, parsed.vacation, { externalRequires: parsed.externalRequires });
+      const reparsed = parseScript(regenerated);
+
+      const externalAfter = reparsed.rules.filter(r => r.origin === 'external');
+      expect(externalAfter).toHaveLength(1);
+      expect(externalAfter[0].name).toBe('Untouchable');
+      expect(externalAfter[0].conditions[0]).toMatchObject({ field: 'header', headerName: 'X-Spam' });
+    });
+  });
+
+  describe('Nextcloud Mail marker regions', () => {
+    const NEXTCLOUD_MARKER = "### Nextcloud Mail: Filters ### DON'T EDIT ###";
+
+    const nextcloudScript = [
+      NEXTCLOUD_MARKER,
+      'require ["imap4flags", "fileinto"];',
+      NEXTCLOUD_MARKER,
+      '',
+      NEXTCLOUD_MARKER,
+      '# FILTER: [{"name":"Wetterwarnungen"}]',
+      'if header :contains "From" "weather@x.com" {',
+      '    fileinto "Weather";',
+      '}',
+      '',
+      '# PayPal',
+      'if header :contains "From" "paypal.de" {',
+      '    addflag "$paypal";',
+      '}',
+      NEXTCLOUD_MARKER,
+      '',
+    ].join('\n');
+
+    it('collapses a Nextcloud marker-pair region into one opaque rule labeled "Nextcloud"', () => {
+      const result = parseScript(nextcloudScript);
+      const nextcloud = result.rules.filter(r => r.originLabel === 'Nextcloud');
+      expect(nextcloud).toHaveLength(1);
+      expect(nextcloud[0].origin).toBe('opaque');
+      // Every marker that wrapped actual rule content survives in the rawBlock.
+      const markerCount = (nextcloud[0].rawBlock || '').split(NEXTCLOUD_MARKER).length - 1;
+      expect(markerCount).toBe(2);
+      // Inner if-blocks are not exposed as separate external rules.
+      expect(result.rules.filter(r => r.originLabel === 'External')).toHaveLength(0);
+    });
+
+    it('merges require tokens from inside Nextcloud regions into externalRequires', () => {
+      const result = parseScript(nextcloudScript);
+      expect(result.externalRequires).toEqual(expect.arrayContaining(['imap4flags', 'fileinto']));
+    });
+
+    it('drops require-only Nextcloud regions (no separate opaque rule for them)', () => {
+      const script = [
+        NEXTCLOUD_MARKER,
+        'require ["fileinto"];',
+        NEXTCLOUD_MARKER,
+        '',
+      ].join('\n');
+      const result = parseScript(script);
+      expect(result.rules).toHaveLength(0);
+      expect(result.externalRequires).toContain('fileinto');
+    });
+
+    it('round-trips a Nextcloud region verbatim through parse → generate → parse', () => {
+      const bulwark = makeBulwarkRule({ name: 'Test' });
+      const initial = `${generateScript([bulwark])}\n${nextcloudScript}`;
+
+      const parsed = parseScript(initial);
+      const regenerated = generateScript(parsed.rules, parsed.vacation, {
+        externalRequires: parsed.externalRequires,
+      });
+
+      // Both wrapping markers remain, in the right positions.
+      const firstMarker = regenerated.indexOf(NEXTCLOUD_MARKER);
+      const lastMarker = regenerated.lastIndexOf(NEXTCLOUD_MARKER);
+      expect(firstMarker).toBeGreaterThanOrEqual(0);
+      expect(lastMarker).toBeGreaterThan(firstMarker);
+      expect(regenerated).toContain('# FILTER: [{"name":"Wetterwarnungen"}]');
+      expect(regenerated).toContain('# PayPal');
+
+      const reparsed = parseScript(regenerated);
+      expect(reparsed.rules.filter(r => r.originLabel === 'Nextcloud')).toHaveLength(1);
+      expect(reparsed.rules.filter(r => r.originLabel === 'External')).toHaveLength(0);
+    });
+
+    it('does not emit duplicate "External rules" headers across repeated saves', () => {
+      const bulwark = makeBulwarkRule({ name: 'Test' });
+      const initial = `${generateScript([bulwark])}\n${nextcloudScript}`;
+
+      let script = initial;
+      for (let i = 0; i < 3; i++) {
+        const parsed = parseScript(script);
+        script = generateScript(parsed.rules, parsed.vacation, {
+          externalRequires: parsed.externalRequires,
+        });
+      }
+
+      const headerCount = (script.match(/# --- External rules \(managed outside Bulwark\) ---/g) || []).length;
+      expect(headerCount).toBe(1);
+    });
+  });
+});

src/lib/sieve/__tests__/fixtures/mixed-origins.sieve

@@ -0,0 +1,44 @@
+/* @metadata:begin
+{"version":1,"rules":[{"id":"bw-news","name":"Archive newsletters","enabled":true,"matchType":"any","conditions":[{"field":"header","comparator":"contains","value":"unsubscribe","headerName":"List-Unsubscribe"},{"field":"from","comparator":"contains","value":"newsletter@"}],"actions":[{"type":"move","value":"Newsletters"}],"stopProcessing":false},{"id":"bw-vip","name":"Flag VIP senders","enabled":true,"matchType":"any","conditions":[{"field":"from","comparator":"is","value":"ceo@company.com"},{"field":"from","comparator":"is","value":"board@company.com"}],"actions":[{"type":"star"},{"type":"mark_read"}],"stopProcessing":false}]}
+@metadata:end */
+
+require ["body", "copy", "fileinto", "imap4flags", "relational"];
+
+# Rule: Archive newsletters
+if anyof(header :contains "List-Unsubscribe" "unsubscribe", header :contains "From" "newsletter@") {
+    fileinto "Newsletters";
+}
+
+# Rule: Flag VIP senders
+if anyof(header :is "From" "ceo@company.com", header :is "From" "board@company.com") {
+    addflag "\\Flagged";
+    addflag "\\Seen";
+}
+
+# --- External rules (managed outside Bulwark) ---
+
+# rule:[Finance - auto-file invoices]
+if allof(header :contains "From" "billing@", header :contains "Subject" "invoice") {
+    fileinto :copy "Finance/Invoices";
+    keep;
+}
+
+# Nextcloud Mail - begin
+# Filter installed by Nextcloud Mail app
+if header :contains "Subject" "[Support]" {
+    fileinto "Support";
+}
+# Nextcloud Mail - end
+
+# A handwritten rule without a tool-specific marker.
+# Bulwark should recognize this as generic "External" and preserve it.
+if not header :is "X-Spam-Status" "No" {
+    fileinto "Junk";
+}
+
+# A rule using a Sieve construct Bulwark's visual editor does not understand.
+# It must survive round-trips verbatim, shown to the user as read-only.
+if header :value "ge" :comparator "i;ascii-numeric" "X-Priority" ["3"] {
+    fileinto "LowPriority";
+    stop;
+}

src/lib/sieve/__tests__/generator.test.ts

@@ -0,0 +1,470 @@
+import { describe, it, expect } from 'vitest';
+import { generateScript } from '../generator';
+import { parseScript } from '../parser';
+import type { FilterRule } from '../types';
+
+function makeRule(overrides: Partial<FilterRule> = {}): FilterRule {
+  return {
+    id: 'rule-1',
+    name: 'Test Rule',
+    enabled: true,
+    matchType: 'all',
+    conditions: [{ field: 'from', comparator: 'contains', value: 'test@example.com' }],
+    actions: [{ type: 'move', value: 'Archive' }],
+    stopProcessing: false,
+    ...overrides,
+  };
+}
+
+describe('generateScript', () => {
+  it('outputs metadata and no require for empty rules', () => {
+    const script = generateScript([]);
+    expect(script).toContain('/* @metadata:begin');
+    expect(script).toContain('@metadata:end */');
+    expect(script).not.toContain('require');
+  });
+
+  it('embeds compact metadata JSON', () => {
+    const rules = [makeRule()];
+    const script = generateScript(rules);
+    const match = script.match(/@metadata:begin\n(.*)\n@metadata:end/);
+    expect(match).not.toBeNull();
+    const metadata = JSON.parse(match![1]);
+    expect(metadata.version).toBe(1);
+    expect(metadata.rules).toHaveLength(1);
+    expect(metadata.rules[0].id).toBe('rule-1');
+  });
+
+  it('generates single rule with from/contains', () => {
+    const script = generateScript([makeRule()]);
+    expect(script).toContain('# Rule: Test Rule');
+    expect(script).toContain('if header :contains "From" "test@example.com"');
+    expect(script).toContain('fileinto "Archive";');
+  });
+
+  describe('condition fields', () => {
+    it('maps to field to "To" header', () => {
+      const script = generateScript([makeRule({
+        conditions: [{ field: 'to', comparator: 'contains', value: 'me@x.com' }],
+      })]);
+      expect(script).toContain('header :contains "To" "me@x.com"');
+    });
+
+    it('maps cc field to "Cc" header', () => {
+      const script = generateScript([makeRule({
+        conditions: [{ field: 'cc', comparator: 'is', value: 'cc@x.com' }],
+      })]);
+      expect(script).toContain('header :is "Cc" "cc@x.com"');
+    });
+
+    it('maps subject field to "Subject" header', () => {
+      const script = generateScript([makeRule({
+        conditions: [{ field: 'subject', comparator: 'contains', value: 'hello' }],
+      })]);
+      expect(script).toContain('header :contains "Subject" "hello"');
+    });
+
+    it('maps header field with custom headerName', () => {
+      const script = generateScript([makeRule({
+        conditions: [{ field: 'header', comparator: 'contains', value: 'test', headerName: 'X-Custom' }],
+      })]);
+      expect(script).toContain('header :contains "X-Custom" "test"');
+    });
+
+    it('handles size greater_than', () => {
+      const script = generateScript([makeRule({
+        conditions: [{ field: 'size', comparator: 'greater_than', value: '1000000' }],
+      })]);
+      expect(script).toContain('size :over 1000000');
+    });
+
+    it('handles size less_than', () => {
+      const script = generateScript([makeRule({
+        conditions: [{ field: 'size', comparator: 'less_than', value: '500' }],
+      })]);
+      expect(script).toContain('size :under 500');
+    });
+
+    it('handles body contains', () => {
+      const script = generateScript([makeRule({
+        conditions: [{ field: 'body', comparator: 'contains', value: 'keyword' }],
+      })]);
+      expect(script).toContain('body :contains "keyword"');
+      expect(script).toContain('"body"');
+    });
+
+    it('handles body is', () => {
+      const script = generateScript([makeRule({
+        conditions: [{ field: 'body', comparator: 'is', value: 'exact' }],
+      })]);
+      expect(script).toContain('body :is "exact"');
+    });
+  });
+
+  describe('comparators', () => {
+    it('generates not_contains with not wrapper', () => {
+      const script = generateScript([makeRule({
+        conditions: [{ field: 'from', comparator: 'not_contains', value: 'spam' }],
+      })]);
+      expect(script).toContain('not header :contains "From" "spam"');
+    });
+
+    it('generates not_is with not wrapper', () => {
+      const script = generateScript([makeRule({
+        conditions: [{ field: 'from', comparator: 'not_is', value: 'bad@x.com' }],
+      })]);
+      expect(script).toContain('not header :is "From" "bad@x.com"');
+    });
+
+    it('generates starts_with as :matches with trailing *', () => {
+      const script = generateScript([makeRule({
+        conditions: [{ field: 'subject', comparator: 'starts_with', value: 'Re:' }],
+      })]);
+      expect(script).toContain('header :matches "Subject" "Re:*"');
+    });
+
+    it('generates ends_with as :matches with leading *', () => {
+      const script = generateScript([makeRule({
+        conditions: [{ field: 'subject', comparator: 'ends_with', value: 'urgent' }],
+      })]);
+      expect(script).toContain('header :matches "Subject" "*urgent"');
+    });
+
+    it('generates matches as :matches', () => {
+      const script = generateScript([makeRule({
+        conditions: [{ field: 'from', comparator: 'matches', value: '*@company.com' }],
+      })]);
+      expect(script).toContain('header :matches "From" "*@company.com"');
+    });
+  });
+
+  describe('match types', () => {
+    it('wraps multiple conditions with allof for matchType all', () => {
+      const script = generateScript([makeRule({
+        matchType: 'all',
+        conditions: [
+          { field: 'from', comparator: 'contains', value: 'a' },
+          { field: 'subject', comparator: 'contains', value: 'b' },
+        ],
+      })]);
+      expect(script).toContain('allof(header :contains "From" "a", header :contains "Subject" "b")');
+    });
+
+    it('wraps multiple conditions with anyof for matchType any', () => {
+      const script = generateScript([makeRule({
+        matchType: 'any',
+        conditions: [
+          { field: 'from', comparator: 'contains', value: 'x' },
+          { field: 'to', comparator: 'contains', value: 'y' },
+        ],
+      })]);
+      expect(script).toContain('anyof(header :contains "From" "x", header :contains "To" "y")');
+    });
+
+    it('uses no wrapper for single condition', () => {
+      const script = generateScript([makeRule()]);
+      expect(script).not.toContain('allof');
+      expect(script).not.toContain('anyof');
+    });
+  });
+
+  describe('actions', () => {
+    it('generates move as fileinto', () => {
+      const script = generateScript([makeRule({ actions: [{ type: 'move', value: 'Spam' }] })]);
+      expect(script).toContain('fileinto "Spam";');
+    });
+
+    it('generates copy as fileinto :copy', () => {
+      const script = generateScript([makeRule({ actions: [{ type: 'copy', value: 'Backup' }] })]);
+      expect(script).toContain('fileinto :copy "Backup";');
+    });
+
+    it('generates forward as redirect', () => {
+      const script = generateScript([makeRule({ actions: [{ type: 'forward', value: 'fwd@x.com' }] })]);
+      expect(script).toContain('redirect "fwd@x.com";');
+    });
+
+    it('generates mark_read as addflag \\Seen', () => {
+      const script = generateScript([makeRule({ actions: [{ type: 'mark_read' }] })]);
+      expect(script).toContain('addflag "\\\\Seen";');
+    });
+
+    it('generates star as addflag \\Flagged', () => {
+      const script = generateScript([makeRule({ actions: [{ type: 'star' }] })]);
+      expect(script).toContain('addflag "\\\\Flagged";');
+    });
+
+    it('generates add_label as addflag $label:Label', () => {
+      const script = generateScript([makeRule({ actions: [{ type: 'add_label', value: 'Important' }] })]);
+      expect(script).toContain('addflag "$label:Important";');
+    });
+
+    it('generates discard', () => {
+      const script = generateScript([makeRule({ actions: [{ type: 'discard' }] })]);
+      expect(script).toContain('discard;');
+    });
+
+    it('generates reject with message', () => {
+      const script = generateScript([makeRule({ actions: [{ type: 'reject', value: 'Go away' }] })]);
+      expect(script).toContain('reject "Go away";');
+    });
+
+    it('generates keep', () => {
+      const script = generateScript([makeRule({ actions: [{ type: 'keep' }] })]);
+      expect(script).toContain('keep;');
+    });
+
+    it('generates stop', () => {
+      const script = generateScript([makeRule({ actions: [{ type: 'stop' }] })]);
+      expect(script).toContain('stop;');
+    });
+  });
+
+  describe('stopProcessing', () => {
+    it('appends stop when stopProcessing is true', () => {
+      const script = generateScript([makeRule({ stopProcessing: true })]);
+      const ifBlock = script.slice(script.indexOf('if '));
+      expect(ifBlock).toContain('stop;');
+    });
+
+    it('does not duplicate stop if last action is stop', () => {
+      const script = generateScript([makeRule({
+        actions: [{ type: 'move', value: 'X' }, { type: 'stop' }],
+        stopProcessing: true,
+      })]);
+      const matches = script.match(/stop;/g);
+      expect(matches).toHaveLength(1);
+    });
+
+    it('does not append stop after discard', () => {
+      const script = generateScript([makeRule({
+        actions: [{ type: 'discard' }],
+        stopProcessing: true,
+      })]);
+      const matches = script.match(/stop;/g);
+      expect(matches).toBeNull();
+    });
+
+    it('does not append stop after reject', () => {
+      const script = generateScript([makeRule({
+        actions: [{ type: 'reject', value: 'No' }],
+        stopProcessing: true,
+      })]);
+      const matches = script.match(/stop;/g);
+      expect(matches).toBeNull();
+    });
+  });
+
+  describe('disabled rules', () => {
+    it('excludes disabled rules from Sieve code', () => {
+      const script = generateScript([makeRule({ enabled: false, name: 'Hidden' })]);
+      expect(script).not.toContain('# Rule: Hidden');
+      expect(script).not.toContain('if header');
+    });
+
+    it('preserves disabled rules in metadata', () => {
+      const rules = [makeRule({ enabled: false })];
+      const script = generateScript(rules);
+      const match = script.match(/@metadata:begin\n(.*)\n@metadata:end/);
+      const metadata = JSON.parse(match![1]);
+      expect(metadata.rules[0].enabled).toBe(false);
+    });
+
+    it('handles mixed enabled and disabled rules', () => {
+      const rules = [
+        makeRule({ id: '1', name: 'Active', enabled: true }),
+        makeRule({ id: '2', name: 'Inactive', enabled: false }),
+        makeRule({ id: '3', name: 'Also Active', enabled: true }),
+      ];
+      const script = generateScript(rules);
+      expect(script).toContain('# Rule: Active');
+      expect(script).not.toContain('# Rule: Inactive');
+      expect(script).toContain('# Rule: Also Active');
+    });
+  });
+
+  describe('require extensions', () => {
+    it('includes fileinto for move', () => {
+      const script = generateScript([makeRule({ actions: [{ type: 'move', value: 'X' }] })]);
+      expect(script).toContain('"fileinto"');
+    });
+
+    it('includes fileinto and copy for copy action', () => {
+      const script = generateScript([makeRule({ actions: [{ type: 'copy', value: 'X' }] })]);
+      expect(script).toContain('"copy"');
+      expect(script).toContain('"fileinto"');
+    });
+
+    it('includes imap4flags for mark_read', () => {
+      const script = generateScript([makeRule({ actions: [{ type: 'mark_read' }] })]);
+      expect(script).toContain('"imap4flags"');
+    });
+
+    it('includes imap4flags for star', () => {
+      const script = generateScript([makeRule({ actions: [{ type: 'star' }] })]);
+      expect(script).toContain('"imap4flags"');
+    });
+
+    it('includes imap4flags for add_label', () => {
+      const script = generateScript([makeRule({ actions: [{ type: 'add_label', value: 'X' }] })]);
+      expect(script).toContain('"imap4flags"');
+    });
+
+    it('includes reject for reject action', () => {
+      const script = generateScript([makeRule({ actions: [{ type: 'reject', value: 'No' }] })]);
+      expect(script).toContain('"reject"');
+    });
+
+    it('includes body extension for body conditions', () => {
+      const script = generateScript([makeRule({
+        conditions: [{ field: 'body', comparator: 'contains', value: 'test' }],
+      })]);
+      expect(script).toContain('"body"');
+    });
+
+    it('deduplicates extensions', () => {
+      const script = generateScript([
+        makeRule({ id: '1', actions: [{ type: 'star' }] }),
+        makeRule({ id: '2', actions: [{ type: 'mark_read' }] }),
+      ]);
+      const matches = script.match(/"imap4flags"/g);
+      expect(matches).toHaveLength(1);
+    });
+
+    it('only considers enabled rules for requires', () => {
+      const script = generateScript([
+        makeRule({ id: '1', enabled: false, actions: [{ type: 'reject', value: 'X' }] }),
+        makeRule({ id: '2', enabled: true, actions: [{ type: 'move', value: 'Y' }] }),
+      ]);
+      const requireLine = script.split('\n').find(l => l.startsWith('require'));
+      expect(requireLine).not.toContain('reject');
+      expect(requireLine).toContain('fileinto');
+    });
+  });
+
+  describe('escaping', () => {
+    it('escapes double quotes in values', () => {
+      const script = generateScript([makeRule({
+        conditions: [{ field: 'subject', comparator: 'contains', value: 'say "hello"' }],
+      })]);
+      expect(script).toContain('say \\"hello\\"');
+    });
+
+    it('escapes backslashes in values', () => {
+      const script = generateScript([makeRule({
+        conditions: [{ field: 'subject', comparator: 'contains', value: 'path\\to\\file' }],
+      })]);
+      expect(script).toContain('path\\\\to\\\\file');
+    });
+
+    it('escapes folder names in actions', () => {
+      const script = generateScript([makeRule({
+        actions: [{ type: 'move', value: 'My "Folder"' }],
+      })]);
+      expect(script).toContain('fileinto "My \\"Folder\\"";');
+    });
+  });
+
+  describe('round-trip', () => {
+    it('preserves rules through generate → parse cycle', () => {
+      const rules: FilterRule[] = [
+        makeRule({ id: '1', name: 'Rule A', enabled: true }),
+        makeRule({ id: '2', name: 'Rule B', enabled: false }),
+        makeRule({
+          id: '3',
+          name: 'Complex',
+          matchType: 'any',
+          conditions: [
+            { field: 'from', comparator: 'contains', value: 'boss' },
+            { field: 'subject', comparator: 'starts_with', value: 'URGENT' },
+          ],
+          actions: [{ type: 'star' }, { type: 'mark_read' }],
+          stopProcessing: true,
+        }),
+      ];
+      const script = generateScript(rules);
+      const result = parseScript(script);
+      expect(result.isOpaque).toBe(false);
+      expect(result.rules).toEqual(rules);
+    });
+  });
+
+  it('generates multiple rules in order', () => {
+    const rules = [
+      makeRule({ id: '1', name: 'First', actions: [{ type: 'move', value: 'A' }] }),
+      makeRule({ id: '2', name: 'Second', actions: [{ type: 'move', value: 'B' }] }),
+    ];
+    const script = generateScript(rules);
+    const firstIdx = script.indexOf('# Rule: First');
+    const secondIdx = script.indexOf('# Rule: Second');
+    expect(firstIdx).toBeLessThan(secondIdx);
+  });
+
+  describe('edge cases', () => {
+    it('skips rules with empty conditions', () => {
+      const script = generateScript([makeRule({ name: 'Empty', conditions: [], actions: [{ type: 'keep' }] })]);
+      expect(script).not.toContain('# Rule: Empty');
+      expect(script).not.toContain('if ');
+    });
+
+    it('skips rules with empty actions', () => {
+      const script = generateScript([makeRule({ name: 'NoAction', actions: [] })]);
+      expect(script).not.toContain('# Rule: NoAction');
+      expect(script).not.toContain('if ');
+    });
+
+    it('uses X-Unknown for header field without headerName', () => {
+      const script = generateScript([makeRule({
+        conditions: [{ field: 'header', comparator: 'contains', value: 'test' }],
+      })]);
+      expect(script).toContain('header :contains "X-Unknown" "test"');
+    });
+
+    it('handles all enabled rules with different extensions combined', () => {
+      const rules = [
+        makeRule({ id: '1', actions: [{ type: 'move', value: 'A' }] }),
+        makeRule({ id: '2', actions: [{ type: 'reject', value: 'No' }] }),
+        makeRule({ id: '3', conditions: [{ field: 'body', comparator: 'contains', value: 'x' }], actions: [{ type: 'star' }] }),
+      ];
+      const script = generateScript(rules);
+      const requireLine = script.split('\n').find(l => l.startsWith('require'))!;
+      expect(requireLine).toContain('"fileinto"');
+      expect(requireLine).toContain('"reject"');
+      expect(requireLine).toContain('"body"');
+      expect(requireLine).toContain('"imap4flags"');
+    });
+
+    it('generates no require line when only keep/discard/stop/forward actions', () => {
+      const script = generateScript([makeRule({
+        actions: [{ type: 'keep' }, { type: 'forward', value: 'a@b.com' }],
+      })]);
+      expect(script).not.toContain('require');
+    });
+
+    it('handles multiple actions on same rule', () => {
+      const script = generateScript([makeRule({
+        actions: [
+          { type: 'move', value: 'Folder' },
+          { type: 'mark_read' },
+          { type: 'star' },
+          { type: 'stop' },
+        ],
+      })]);
+      expect(script).toContain('fileinto "Folder";');
+      expect(script).toContain('addflag "\\\\Seen";');
+      expect(script).toContain('addflag "\\\\Flagged";');
+      expect(script).toContain('stop;');
+    });
+
+    it('generates valid script for all-disabled rules', () => {
+      const rules = [
+        makeRule({ id: '1', enabled: false }),
+        makeRule({ id: '2', enabled: false }),
+      ];
+      const script = generateScript(rules);
+      expect(script).toContain('@metadata:begin');
+      expect(script).not.toContain('if ');
+      expect(script).not.toContain('require');
+    });
+  });
+});

src/lib/sieve/__tests__/parser.test.ts

@@ -0,0 +1,218 @@
+import { describe, it, expect } from 'vitest';
+import { parseScript } from '../parser';
+import { generateScript } from '../generator';
+import type { FilterRule } from '../types';
+
+function makeRule(overrides: Partial<FilterRule> = {}): FilterRule {
+  return {
+    id: 'rule-1',
+    name: 'Test Rule',
+    enabled: true,
+    matchType: 'all',
+    conditions: [{ field: 'from', comparator: 'contains', value: 'test@example.com' }],
+    actions: [{ type: 'move', value: 'Archive' }],
+    stopProcessing: false,
+    ...overrides,
+  };
+}
+
+describe('parseScript', () => {
+  it('extracts rules from valid metadata', () => {
+    const rules = [makeRule()];
+    const script = generateScript(rules);
+    const result = parseScript(script);
+    expect(result.isOpaque).toBe(false);
+    expect(result.rules).toEqual(rules);
+  });
+
+  it('parses external rules when no Bulwark metadata is present', () => {
+    const result = parseScript('require ["fileinto"];\nif header :contains "From" "x" { fileinto "Y"; }');
+    expect(result.isOpaque).toBe(false);
+    expect(result.rules).toHaveLength(1);
+    expect(result.rules[0].origin).toBe('external');
+    expect(result.rules[0].conditions[0]).toMatchObject({ field: 'from', comparator: 'contains', value: 'x' });
+    expect(result.rules[0].actions[0]).toEqual({ type: 'move', value: 'Y' });
+    expect(result.externalRequires).toContain('fileinto');
+  });
+
+  it('returns isOpaque for corrupted JSON', () => {
+    const script = '/* @metadata:begin\n{not valid json\n@metadata:end */';
+    const result = parseScript(script);
+    expect(result.isOpaque).toBe(true);
+    expect(result.rules).toEqual([]);
+  });
+
+  it('returns isOpaque for version mismatch', () => {
+    const script = '/* @metadata:begin\n{"version":2,"rules":[]}\n@metadata:end */';
+    const result = parseScript(script);
+    expect(result.isOpaque).toBe(true);
+    expect(result.rules).toEqual([]);
+  });
+
+  it('returns isOpaque for empty metadata block', () => {
+    const script = '/* @metadata:begin\n\n@metadata:end */';
+    const result = parseScript(script);
+    expect(result.isOpaque).toBe(true);
+    expect(result.rules).toEqual([]);
+  });
+
+  it('returns isOpaque for missing rules array', () => {
+    const script = '/* @metadata:begin\n{"version":1}\n@metadata:end */';
+    const result = parseScript(script);
+    expect(result.isOpaque).toBe(true);
+    expect(result.rules).toEqual([]);
+  });
+
+  it('returns isOpaque for invalid rule objects', () => {
+    const script = '/* @metadata:begin\n{"version":1,"rules":[{"id":"x"}]}\n@metadata:end */';
+    const result = parseScript(script);
+    expect(result.isOpaque).toBe(true);
+    expect(result.rules).toEqual([]);
+  });
+
+  it('handles metadata with extra whitespace', () => {
+    const rules = [makeRule()];
+    const json = JSON.stringify({ version: 1, rules });
+    const script = `/* @metadata:begin\n   ${json}   \n@metadata:end */\n\nrequire ["fileinto"];`;
+    const result = parseScript(script);
+    expect(result.isOpaque).toBe(false);
+    expect(result.rules).toEqual(rules);
+  });
+
+  it('handles script with only metadata block', () => {
+    const rules = [makeRule({ enabled: false })];
+    const json = JSON.stringify({ version: 1, rules });
+    const script = `/* @metadata:begin\n${json}\n@metadata:end */`;
+    const result = parseScript(script);
+    expect(result.isOpaque).toBe(false);
+    expect(result.rules).toEqual(rules);
+  });
+
+  it('returns isOpaque for missing end marker', () => {
+    const script = '/* @metadata:begin\n{"version":1,"rules":[]}';
+    const result = parseScript(script);
+    expect(result.isOpaque).toBe(true);
+  });
+
+  it('treats an empty string as an empty, editable script (not opaque)', () => {
+    const result = parseScript('');
+    expect(result.isOpaque).toBe(false);
+    expect(result.rules).toEqual([]);
+  });
+
+  describe('round-trip', () => {
+    it('preserves complex rules through generate → parse', () => {
+      const rules: FilterRule[] = [
+        makeRule({ id: '1', name: 'Newsletter', enabled: true, stopProcessing: true }),
+        makeRule({
+          id: '2',
+          name: 'VIP',
+          matchType: 'any',
+          conditions: [
+            { field: 'from', comparator: 'is', value: 'boss@company.com' },
+            { field: 'from', comparator: 'is', value: 'ceo@company.com' },
+          ],
+          actions: [{ type: 'star' }, { type: 'mark_read' }],
+        }),
+        makeRule({ id: '3', name: 'Disabled', enabled: false }),
+      ];
+      const script = generateScript(rules);
+      const result = parseScript(script);
+      expect(result.isOpaque).toBe(false);
+      expect(result.rules).toEqual(rules);
+    });
+
+    it('preserves rules with special characters', () => {
+      const rules = [makeRule({
+        conditions: [{ field: 'subject', comparator: 'contains', value: 'say "hello" \\ world' }],
+        actions: [{ type: 'move', value: 'My "Folder"' }],
+      })];
+      const script = generateScript(rules);
+      const result = parseScript(script);
+      expect(result.rules).toEqual(rules);
+    });
+
+    it('preserves all action types', () => {
+      const rules = [makeRule({
+        actions: [
+          { type: 'move', value: 'Folder' },
+          { type: 'copy', value: 'Backup' },
+          { type: 'forward', value: 'fwd@x.com' },
+          { type: 'mark_read' },
+          { type: 'star' },
+          { type: 'add_label', value: 'Tag' },
+          { type: 'keep' },
+        ],
+      })];
+      const script = generateScript(rules);
+      const result = parseScript(script);
+      expect(result.rules).toEqual(rules);
+    });
+  });
+
+  describe('validation edge cases', () => {
+    it('returns isOpaque when rule has non-string id', () => {
+      const script = `/* @metadata:begin\n${JSON.stringify({ version: 1, rules: [{ id: 123, name: 'x', enabled: true, matchType: 'all', conditions: [{ field: 'from', comparator: 'contains', value: 'a' }], actions: [{ type: 'keep' }], stopProcessing: false }] })}\n@metadata:end */`;
+      expect(parseScript(script).isOpaque).toBe(true);
+    });
+
+    it('returns isOpaque when rule has non-boolean enabled', () => {
+      const script = `/* @metadata:begin\n${JSON.stringify({ version: 1, rules: [{ id: '1', name: 'x', enabled: 'yes', matchType: 'all', conditions: [{ field: 'from', comparator: 'contains', value: 'a' }], actions: [{ type: 'keep' }], stopProcessing: false }] })}\n@metadata:end */`;
+      expect(parseScript(script).isOpaque).toBe(true);
+    });
+
+    it('returns isOpaque when rule has invalid matchType', () => {
+      const script = `/* @metadata:begin\n${JSON.stringify({ version: 1, rules: [{ id: '1', name: 'x', enabled: true, matchType: 'none', conditions: [{ field: 'from', comparator: 'contains', value: 'a' }], actions: [{ type: 'keep' }], stopProcessing: false }] })}\n@metadata:end */`;
+      expect(parseScript(script).isOpaque).toBe(true);
+    });
+
+    it('returns isOpaque when condition missing value', () => {
+      const script = `/* @metadata:begin\n${JSON.stringify({ version: 1, rules: [{ id: '1', name: 'x', enabled: true, matchType: 'all', conditions: [{ field: 'from', comparator: 'contains' }], actions: [{ type: 'keep' }], stopProcessing: false }] })}\n@metadata:end */`;
+      expect(parseScript(script).isOpaque).toBe(true);
+    });
+
+    it('returns isOpaque when action missing type', () => {
+      const script = `/* @metadata:begin\n${JSON.stringify({ version: 1, rules: [{ id: '1', name: 'x', enabled: true, matchType: 'all', conditions: [{ field: 'from', comparator: 'contains', value: 'a' }], actions: [{ value: 'Inbox' }], stopProcessing: false }] })}\n@metadata:end */`;
+      expect(parseScript(script).isOpaque).toBe(true);
+    });
+
+    it('accepts valid empty rules array', () => {
+      const script = `/* @metadata:begin\n${JSON.stringify({ version: 1, rules: [] })}\n@metadata:end */`;
+      const result = parseScript(script);
+      expect(result.isOpaque).toBe(false);
+      expect(result.rules).toEqual([]);
+    });
+
+    it('preserves all comparator types through round-trip', () => {
+      const comparators = ['contains', 'not_contains', 'is', 'not_is', 'starts_with', 'ends_with', 'matches'] as const;
+      const rules = comparators.map((comparator, i) => makeRule({
+        id: `r${i}`,
+        name: `Rule ${comparator}`,
+        conditions: [{ field: 'from', comparator, value: 'test' }],
+      }));
+      const script = generateScript(rules);
+      const result = parseScript(script);
+      expect(result.isOpaque).toBe(false);
+      expect(result.rules).toEqual(rules);
+    });
+
+    it('preserves size comparators through round-trip', () => {
+      const rules = [
+        makeRule({ id: 'r1', conditions: [{ field: 'size', comparator: 'greater_than', value: '1000' }], actions: [{ type: 'discard' }] }),
+        makeRule({ id: 'r2', conditions: [{ field: 'size', comparator: 'less_than', value: '500' }], actions: [{ type: 'keep' }] }),
+      ];
+      const script = generateScript(rules);
+      const result = parseScript(script);
+      expect(result.rules).toEqual(rules);
+    });
+
+    it('preserves header field with custom headerName', () => {
+      const rules = [makeRule({
+        conditions: [{ field: 'header', comparator: 'contains', value: 'test', headerName: 'X-My-Header' }],
+      })];
+      const script = generateScript(rules);
+      const result = parseScript(script);
+      expect(result.rules).toEqual(rules);
+    });
+  });
+});

src/lib/sieve/generator.ts

@@ -0,0 +1,248 @@
+import type {
+  FilterRule,
+  FilterCondition,
+  FilterAction,
+  FilterMetadata,
+  VacationSieveConfig,
+} from './types';
+
+// Ported from the webmail's lib/sieve/generator.ts. Emits an RFC 5228 Sieve
+// script with a leading `@metadata` JSON comment that lets the parser round-trip
+// the visual rules losslessly. Keep this in sync with the web generator so a
+// script saved on one client reads back cleanly on the other.
+
+const HEADER_MAP: Record<string, string> = {
+  from: 'From',
+  to: 'To',
+  cc: 'Cc',
+  subject: 'Subject',
+};
+
+function escapeString(value: string): string {
+  return value.replace(/\\/g, '\\\\').replace(/"/g, '\\"');
+}
+
+function generateCondition(condition: FilterCondition): string {
+  const { field, comparator, value } = condition;
+
+  if (field === 'size') {
+    const op = comparator === 'greater_than' ? ':over' : ':under';
+    return `size ${op} ${value}`;
+  }
+
+  if (field === 'body') {
+    const matchType = comparator === 'is' ? ':is' : ':contains';
+    return `body ${matchType} "${escapeString(value)}"`;
+  }
+
+  const headerName = field === 'header'
+    ? (condition.headerName || 'X-Unknown')
+    : HEADER_MAP[field];
+
+  const escaped = escapeString(value);
+
+  switch (comparator) {
+    case 'contains':
+      return `header :contains "${headerName}" "${escaped}"`;
+    case 'not_contains':
+      return `not header :contains "${headerName}" "${escaped}"`;
+    case 'is':
+      return `header :is "${headerName}" "${escaped}"`;
+    case 'not_is':
+      return `not header :is "${headerName}" "${escaped}"`;
+    case 'starts_with':
+      return `header :matches "${headerName}" "${escaped}*"`;
+    case 'ends_with':
+      return `header :matches "${headerName}" "*${escaped}"`;
+    case 'matches':
+      return `header :matches "${headerName}" "${escaped}"`;
+    default:
+      return `header :contains "${headerName}" "${escaped}"`;
+  }
+}
+
+function generateActions(actions: FilterAction[]): string[] {
+  return actions.map(action => {
+    switch (action.type) {
+      case 'move':
+        return `fileinto "${escapeString(action.value || '')}";`;
+      case 'copy':
+        return `fileinto :copy "${escapeString(action.value || '')}";`;
+      case 'forward':
+        return `redirect "${escapeString(action.value || '')}";`;
+      case 'mark_read':
+        return 'addflag "\\\\Seen";';
+      case 'star':
+        return 'addflag "\\\\Flagged";';
+      case 'add_label':
+        return `addflag "$label:${escapeString(action.value || '')}";`;
+      case 'discard':
+        return 'discard;';
+      case 'reject':
+        return `reject "${escapeString(action.value || '')}";`;
+      case 'keep':
+        return 'keep;';
+      case 'stop':
+        return 'stop;';
+    }
+  });
+}
+
+function computeRequires(rules: FilterRule[], vacation?: VacationSieveConfig): string[] {
+  const extensions = new Set<string>();
+  const enabledRules = rules.filter(r => r.enabled);
+
+  if (vacation?.isEnabled) {
+    extensions.add('vacation');
+  }
+
+  for (const rule of enabledRules) {
+    for (const condition of rule.conditions) {
+      if (condition.field === 'body') extensions.add('body');
+    }
+    for (const action of rule.actions) {
+      switch (action.type) {
+        case 'move':
+          extensions.add('fileinto');
+          break;
+        case 'copy':
+          extensions.add('fileinto');
+          extensions.add('copy');
+          break;
+        case 'mark_read':
+        case 'star':
+        case 'add_label':
+          extensions.add('imap4flags');
+          break;
+        case 'reject':
+          extensions.add('reject');
+          break;
+      }
+    }
+  }
+
+  return [...extensions];
+}
+
+function stripRuleForMetadata(r: FilterRule): Omit<FilterRule, 'origin' | 'originLabel' | 'rawBlock'> {
+  return {
+    id: r.id,
+    name: r.name,
+    enabled: r.enabled,
+    matchType: r.matchType,
+    conditions: r.conditions,
+    actions: r.actions,
+    stopProcessing: r.stopProcessing,
+  };
+}
+
+export interface GenerateOptions {
+  /**
+   * Require extensions used by external (non-Bulwark) rules that we must
+   * preserve in the top-level `require` directive. Duplicates with Bulwark's
+   * own requires are deduplicated.
+   */
+  externalRequires?: string[];
+}
+
+export function generateScript(
+  rules: FilterRule[],
+  vacation?: VacationSieveConfig,
+  options: GenerateOptions = {},
+): string {
+  // Partition rules by origin. Treat missing origin as 'bulwark' for back-compat.
+  const bulwarkRules: FilterRule[] = [];
+  const externalRules: FilterRule[] = [];
+  for (const r of rules) {
+    if (r.origin && r.origin !== 'bulwark') externalRules.push(r);
+    else bulwarkRules.push(r);
+  }
+
+  const metadata: FilterMetadata = {
+    version: 1,
+    rules: bulwarkRules.map(stripRuleForMetadata) as FilterRule[],
+  };
+  if (vacation?.isEnabled) {
+    metadata.vacation = vacation;
+  }
+  const metadataJson = JSON.stringify(metadata);
+  const lines: string[] = [];
+
+  lines.push('/* @metadata:begin');
+  lines.push(metadataJson);
+  lines.push('@metadata:end */');
+  lines.push('');
+
+  const bulwarkRequires = computeRequires(bulwarkRules, vacation);
+  const externalRequires = options.externalRequires ?? [];
+  const allRequires = [...new Set([...bulwarkRequires, ...externalRequires])].sort();
+
+  if (allRequires.length > 0) {
+    lines.push(`require [${allRequires.map(r => `"${r}"`).join(', ')}];`);
+  }
+
+  if (vacation?.isEnabled) {
+    lines.push('');
+    lines.push('# Vacation auto-reply');
+    const vacationParts: string[] = [];
+    if (vacation.subject) {
+      vacationParts.push(`:subject "${escapeString(vacation.subject)}"`);
+    }
+    vacationParts.push(`"${escapeString(vacation.textBody || '')}"`);
+    lines.push(`vacation ${vacationParts.join(' ')};`);
+  }
+
+  const enabledBulwarkRules = bulwarkRules.filter(r => r.enabled);
+
+  for (const rule of enabledBulwarkRules) {
+    if (rule.conditions.length === 0 || rule.actions.length === 0) {
+      // Empty conditions/actions can't form a valid `if`; the rule modal
+      // prevents this, but skip defensively rather than emit broken Sieve.
+      continue;
+    }
+
+    lines.push('');
+    lines.push(`# Rule: ${rule.name}`);
+
+    const conditions = rule.conditions.map(generateCondition);
+    let conditionStr: string;
+
+    if (conditions.length === 0) {
+      conditionStr = 'true';
+    } else if (conditions.length === 1) {
+      conditionStr = conditions[0];
+    } else {
+      const wrapper = rule.matchType === 'all' ? 'allof' : 'anyof';
+      conditionStr = `${wrapper}(${conditions.join(', ')})`;
+    }
+
+    const actionLines = generateActions(rule.actions);
+
+    if (rule.stopProcessing) {
+      const lastAction = rule.actions[rule.actions.length - 1];
+      if (!lastAction || !['stop', 'discard', 'reject'].includes(lastAction.type)) {
+        actionLines.push('stop;');
+      }
+    }
+
+    lines.push(`if ${conditionStr} {`);
+    for (const actionLine of actionLines) {
+      lines.push(`    ${actionLine}`);
+    }
+    lines.push('}');
+  }
+
+  // Append preserved external rules verbatim. Each rawBlock already carries its
+  // own leading comments and trailing whitespace from the source script.
+  if (externalRules.length > 0) {
+    lines.push('');
+    lines.push('# --- External rules (managed outside Bulwark) ---');
+    for (const ext of externalRules) {
+      if (!ext.rawBlock) continue;
+      lines.push(ext.rawBlock.replace(/\s+$/, ''));
+    }
+  }
+
+  lines.push('');
+  return lines.join('\n');
+}

src/lib/sieve/parser.ts

@@ -0,0 +1,759 @@
+import type {
+  FilterAction,
+  FilterCondition,
+  FilterComparator,
+  FilterConditionField,
+  FilterMetadata,
+  FilterRule,
+  VacationSieveConfig,
+} from './types';
+
+// Ported from the webmail's lib/sieve/parser.ts. Parses a Sieve script back
+// into structured rules. Bulwark-authored scripts carry an `@metadata` JSON
+// block we trust directly; foreign scripts (Roundcube, Nextcloud, hand-edited)
+// are best-effort parsed into read-only "external" rules or preserved opaquely.
+
+export interface ParseResult {
+  rules: FilterRule[];
+  isOpaque: boolean;
+  vacation?: VacationSieveConfig;
+  externalRequires: string[];
+}
+
+const OPAQUE: ParseResult = { rules: [], isOpaque: true, externalRequires: [] };
+
+const METADATA_BEGIN = '/* @metadata:begin';
+const METADATA_END = '@metadata:end */';
+
+const NEXTCLOUD_BLOCK_MARKER = "### Nextcloud Mail: Filters ### DON'T EDIT ###";
+
+const BULWARK_EXTERNAL_HEADER_RE =
+  /^[ \t]*#[ \t]*---[ \t]*External rules \(managed outside Bulwark\)[ \t]*---[ \t]*\r?\n/m;
+
+const FIELD_FROM_HEADER: Record<string, FilterConditionField> = {
+  from: 'from',
+  to: 'to',
+  cc: 'cc',
+  subject: 'subject',
+};
+
+function isValidCondition(c: unknown): boolean {
+  if (!c || typeof c !== 'object') return false;
+  const cond = c as Record<string, unknown>;
+  return typeof cond.field === 'string' && typeof cond.comparator === 'string' && typeof cond.value === 'string';
+}
+
+function isValidAction(a: unknown): boolean {
+  if (!a || typeof a !== 'object') return false;
+  const act = a as Record<string, unknown>;
+  return typeof act.type === 'string';
+}
+
+function isValidRule(rule: unknown): rule is FilterRule {
+  if (!rule || typeof rule !== 'object') return false;
+  const r = rule as Record<string, unknown>;
+  if (
+    typeof r.id !== 'string' ||
+    typeof r.name !== 'string' ||
+    typeof r.enabled !== 'boolean' ||
+    (r.matchType !== 'all' && r.matchType !== 'any') ||
+    !Array.isArray(r.conditions) ||
+    !Array.isArray(r.actions) ||
+    typeof r.stopProcessing !== 'boolean'
+  ) return false;
+
+  return r.conditions.every(isValidCondition) && r.actions.every(isValidAction);
+}
+
+/**
+ * Detect Stalwart-generated vacation-only scripts (no metadata).
+ */
+function detectVacationOnlyScript(content: string): ParseResult | null {
+  if (!/\bvacation\b/.test(content)) return null;
+
+  const stripped = content
+    .replace(/^\s*require\s+\[[^\]]*\]\s*;/gm, '')
+    .replace(/#[^\n]*/g, '')
+    .replace(/\/\*[\s\S]*?\*\//g, '')
+    .trim();
+
+  const structural = stripped.replace(/"(?:[^"\\]|\\.)*"/g, '""');
+
+  if (/\b(?:if|elsif|else)\b/.test(structural)) return null;
+  if (!/\bvacation\b/.test(structural)) return null;
+
+  const subjectMatch = stripped.match(/:subject\s+"((?:[^"\\]|\\.)*)"/);
+  const subject = subjectMatch ? unescapeSieveString(subjectMatch[1]) : '';
+
+  let textBody = '';
+  const mimeBodyMatch = stripped.match(/Content-Transfer-Encoding:[^\r\n]*\r?\n\r?\n([\s\S]*?)"[\s\S]*?;/);
+  if (mimeBodyMatch) {
+    textBody = mimeBodyMatch[1].trim();
+  } else {
+    const allQuoted = [...stripped.matchAll(/"((?:[^"\\]|\\.)*)"/g)];
+    const last = allQuoted[allQuoted.length - 1];
+    if (last) textBody = unescapeSieveString(last[1]);
+  }
+
+  return {
+    rules: [],
+    isOpaque: false,
+    vacation: { isEnabled: true, subject, textBody },
+    externalRequires: [],
+  };
+}
+
+function unescapeSieveString(s: string): string {
+  return s.replace(/\\(.)/g, '$1');
+}
+
+function skipStringLit(s: string, i: number): number {
+  i++;
+  while (i < s.length) {
+    if (s[i] === '\\') { i += 2; continue; }
+    if (s[i] === '"') return i + 1;
+    i++;
+  }
+  return i;
+}
+
+function skipHashComment(s: string, i: number): number {
+  while (i < s.length && s[i] !== '\n') i++;
+  return i;
+}
+
+function skipBlockComment(s: string, i: number): number {
+  const end = s.indexOf('*/', i + 2);
+  return end === -1 ? s.length : end + 2;
+}
+
+function skipStatement(s: string, i: number): number {
+  while (i < s.length) {
+    const c = s[i];
+    if (c === '"') { i = skipStringLit(s, i); continue; }
+    if (c === '#') { i = skipHashComment(s, i); continue; }
+    if (c === '/' && s[i + 1] === '*') { i = skipBlockComment(s, i); continue; }
+    if (c === ';') return i + 1;
+    i++;
+  }
+  return i;
+}
+
+function skipBalanced(s: string, i: number, open: string, close: string): number {
+  let depth = 0;
+  while (i < s.length) {
+    const c = s[i];
+    if (c === '"') { i = skipStringLit(s, i); continue; }
+    if (c === '#') { i = skipHashComment(s, i); continue; }
+    if (c === '/' && s[i + 1] === '*') { i = skipBlockComment(s, i); continue; }
+    if (c === open) { depth++; i++; continue; }
+    if (c === close) {
+      depth--;
+      i++;
+      if (depth === 0) return i;
+      continue;
+    }
+    i++;
+  }
+  return i;
+}
+
+function skipIfStatement(s: string, i: number): number {
+  // positioned after 'if' keyword; skip through condition expression and body braces
+  while (i < s.length && s[i] !== '{') {
+    const c = s[i];
+    if (c === '"') { i = skipStringLit(s, i); continue; }
+    if (c === '(') { i = skipBalanced(s, i, '(', ')'); continue; }
+    if (c === '#') { i = skipHashComment(s, i); continue; }
+    if (c === '/' && s[i + 1] === '*') { i = skipBlockComment(s, i); continue; }
+    i++;
+  }
+  if (i >= s.length) return i;
+  return skipBalanced(s, i, '{', '}');
+}
+
+interface TopBlock {
+  kind: 'require' | 'if' | 'vacation' | 'other';
+  raw: string;          // from start-of-leading-text to end of statement
+  statement: string;    // the statement itself (no leading comments/whitespace)
+  startIdx: number;
+  endIdx: number;
+}
+
+function scanTopLevel(content: string): TopBlock[] {
+  const blocks: TopBlock[] = [];
+  let i = 0;
+  let segmentStart = 0;
+
+  const consume = (kind: TopBlock['kind'], stmtStart: number, stmtEnd: number) => {
+    blocks.push({
+      kind,
+      raw: content.slice(segmentStart, stmtEnd),
+      statement: content.slice(stmtStart, stmtEnd),
+      startIdx: segmentStart,
+      endIdx: stmtEnd,
+    });
+    segmentStart = stmtEnd;
+  };
+
+  while (i < content.length) {
+    // Skip whitespace
+    while (i < content.length && /\s/.test(content[i])) i++;
+    if (i >= content.length) break;
+
+    const c = content[i];
+
+    // Comments (stay attached to next block as leading text)
+    if (c === '#') { i = skipHashComment(content, i); continue; }
+    if (c === '/' && content[i + 1] === '*') { i = skipBlockComment(content, i); continue; }
+
+    // Identifier
+    const m = /^[a-zA-Z_][a-zA-Z0-9_]*/.exec(content.slice(i));
+    if (!m) { i++; continue; }
+
+    const ident = m[0];
+    const stmtStart = i;
+    i += ident.length;
+
+    if (ident === 'require') {
+      i = skipStatement(content, i);
+      consume('require', stmtStart, i);
+    } else if (ident === 'if') {
+      i = skipIfStatement(content, i);
+      consume('if', stmtStart, i);
+    } else if (ident === 'vacation') {
+      i = skipStatement(content, i);
+      consume('vacation', stmtStart, i);
+    } else {
+      i = skipStatement(content, i);
+      consume('other', stmtStart, i);
+    }
+  }
+
+  return blocks;
+}
+
+function extractRequireTokens(stmt: string): string[] {
+  const mList = /require\s+\[([\s\S]*?)\]\s*;/.exec(stmt);
+  if (mList) return [...mList[1].matchAll(/"([^"]+)"/g)].map(x => x[1]);
+  const mSingle = /require\s+"([^"]+)"\s*;/.exec(stmt);
+  return mSingle ? [mSingle[1]] : [];
+}
+
+/**
+ * Extract the last contiguous block of comments immediately preceding a
+ * statement - comments separated from the statement by a blank line are not
+ * considered its leading commentary (they likely belong to the previous
+ * block, e.g. a trailing "# Nextcloud Mail - end" marker).
+ */
+function lastCommentChunk(leading: string): string {
+  const parts = leading.split(/\r?\n\s*\r?\n/).map(s => s.trim()).filter(Boolean);
+  return parts.length ? parts[parts.length - 1] : '';
+}
+
+function detectOriginLabel(leading: string): string {
+  const chunk = lastCommentChunk(leading);
+  const lower = chunk.toLowerCase();
+  if (/rule:\s*\[/i.test(chunk) || /roundcube|managesieve/.test(lower)) return 'Roundcube';
+  if (/nextcloud/.test(lower)) return 'Nextcloud';
+  if (/horde|ingo/.test(lower)) return 'Horde';
+  if (/kolab/.test(lower)) return 'Kolab';
+  if (/dovecot/.test(lower)) return 'Dovecot';
+  if (/thunderbird/.test(lower)) return 'Thunderbird';
+  return 'External';
+}
+
+function extractName(leading: string, fallback: string): string {
+  // Roundcube: "# rule:[Name]"
+  const rc = leading.match(/#\s*rule:\s*\[([^\]]+)\]/i);
+  if (rc) return rc[1].trim();
+
+  // "# Rule: Name"
+  const rr = leading.match(/#\s*Rule:\s*(.+?)\s*$/mi);
+  if (rr) return rr[1].trim();
+
+  // Last non-empty trimmed comment line
+  const lines = leading.split('\n').map(l => l.replace(/^\s*#\s*/, '').trim()).filter(Boolean);
+  const last = lines[lines.length - 1];
+  if (last && last.length <= 80 && !/^\/\*|\*\/$/.test(last)) return last;
+
+  return fallback;
+}
+
+function splitTopLevelComma(s: string): string[] {
+  const parts: string[] = [];
+  let depth = 0;
+  let start = 0;
+  let i = 0;
+  while (i < s.length) {
+    const c = s[i];
+    if (c === '"') { i = skipStringLit(s, i); continue; }
+    if (c === '(' || c === '[' || c === '{') { depth++; i++; continue; }
+    if (c === ')' || c === ']' || c === '}') { depth--; i++; continue; }
+    if (c === ',' && depth === 0) {
+      parts.push(s.slice(start, i));
+      start = i + 1;
+    }
+    i++;
+  }
+  parts.push(s.slice(start));
+  return parts.map(p => p.trim()).filter(Boolean);
+}
+
+function splitStatements(body: string): string[] {
+  const stmts: string[] = [];
+  let start = 0;
+  let i = 0;
+  while (i < body.length) {
+    const c = body[i];
+    if (c === '"') { i = skipStringLit(body, i); continue; }
+    if (c === '#') { i = skipHashComment(body, i); continue; }
+    if (c === '/' && body[i + 1] === '*') { i = skipBlockComment(body, i); continue; }
+    if (c === ';') {
+      stmts.push(body.slice(start, i));
+      start = i + 1;
+    }
+    i++;
+  }
+  const tail = body.slice(start).trim();
+  if (tail) stmts.push(tail);
+  return stmts.map(s => s.trim()).filter(Boolean);
+}
+
+function normalizeHeaderName(name: string): { field: FilterConditionField; headerName?: string } {
+  const lc = name.toLowerCase();
+  if (FIELD_FROM_HEADER[lc]) return { field: FIELD_FROM_HEADER[lc] };
+  return { field: 'header', headerName: name };
+}
+
+function parseAtom(raw: string): FilterCondition | null {
+  let s = raw.trim();
+  let negated = false;
+
+  if (/^not\b/.test(s)) {
+    negated = true;
+    s = s.replace(/^not\s*/, '').trim();
+    if (s.startsWith('(') && s.endsWith(')')) {
+      s = s.slice(1, -1).trim();
+    }
+  }
+
+  let m = /^header\s+:(contains|is|matches)\s+"((?:[^"\\]|\\.)*)"\s+"((?:[^"\\]|\\.)*)"$/.exec(s);
+  if (m) {
+    const [, tag, headerName, rawValue] = m;
+    const value = unescapeSieveString(rawValue);
+    const { field, headerName: customHeaderName } = normalizeHeaderName(unescapeSieveString(headerName));
+
+    let comparator: FilterComparator;
+    if (tag === 'contains') {
+      comparator = negated ? 'not_contains' : 'contains';
+    } else if (tag === 'is') {
+      comparator = negated ? 'not_is' : 'is';
+    } else {
+      // :matches - distinguish starts_with / ends_with / matches
+      const starPositions = [...value].reduce<number[]>((acc, ch, idx) => (ch === '*' ? [...acc, idx] : acc), []);
+      if (starPositions.length === 1 && starPositions[0] === value.length - 1) {
+        comparator = 'starts_with';
+        const cond: FilterCondition = { field, comparator, value: value.slice(0, -1) };
+        if (customHeaderName !== undefined) cond.headerName = customHeaderName;
+        return cond;
+      }
+      if (starPositions.length === 1 && starPositions[0] === 0) {
+        comparator = 'ends_with';
+        const cond: FilterCondition = { field, comparator, value: value.slice(1) };
+        if (customHeaderName !== undefined) cond.headerName = customHeaderName;
+        return cond;
+      }
+      comparator = 'matches';
+    }
+
+    const cond: FilterCondition = { field, comparator, value };
+    if (customHeaderName !== undefined) cond.headerName = customHeaderName;
+    return cond;
+  }
+
+  m = /^body\s+:(contains|is)\s+"((?:[^"\\]|\\.)*)"$/.exec(s);
+  if (m) {
+    return { field: 'body', comparator: m[1] === 'is' ? 'is' : 'contains', value: unescapeSieveString(m[2]) };
+  }
+
+  m = /^size\s+:(over|under)\s+(\d+)$/.exec(s);
+  if (m) {
+    return { field: 'size', comparator: m[1] === 'over' ? 'greater_than' : 'less_than', value: m[2] };
+  }
+
+  return null;
+}
+
+function parseCondition(raw: string): { matchType: 'all' | 'any'; conditions: FilterCondition[] } | null {
+  const s = raw.trim();
+  if (!s) return null;
+
+  const allMatch = /^allof\s*\(([\s\S]*)\)$/.exec(s);
+  const anyMatch = /^anyof\s*\(([\s\S]*)\)$/.exec(s);
+  let matchType: 'all' | 'any' = 'all';
+  let inner: string;
+  if (allMatch) { matchType = 'all'; inner = allMatch[1]; }
+  else if (anyMatch) { matchType = 'any'; inner = anyMatch[1]; }
+  else inner = s;
+
+  const parts = splitTopLevelComma(inner);
+  const conditions: FilterCondition[] = [];
+  for (const part of parts) {
+    const atom = parseAtom(part);
+    if (!atom) return null;
+    conditions.push(atom);
+  }
+  return { matchType, conditions };
+}
+
+function parseAction(raw: string): FilterAction | null {
+  const s = raw.trim();
+
+  let m = /^fileinto\s+:copy\s+"((?:[^"\\]|\\.)*)"$/.exec(s);
+  if (m) return { type: 'copy', value: unescapeSieveString(m[1]) };
+
+  m = /^fileinto\s+"((?:[^"\\]|\\.)*)"$/.exec(s);
+  if (m) return { type: 'move', value: unescapeSieveString(m[1]) };
+
+  m = /^redirect\s+"((?:[^"\\]|\\.)*)"$/.exec(s);
+  if (m) return { type: 'forward', value: unescapeSieveString(m[1]) };
+
+  m = /^addflag\s+"((?:[^"\\]|\\.)*)"$/.exec(s);
+  if (m) {
+    const flag = unescapeSieveString(m[1]);
+    if (flag === '\\Seen') return { type: 'mark_read' };
+    if (flag === '\\Flagged') return { type: 'star' };
+    if (flag.startsWith('$label:')) return { type: 'add_label', value: flag.slice('$label:'.length) };
+    return null;
+  }
+
+  m = /^reject\s+"((?:[^"\\]|\\.)*)"$/.exec(s);
+  if (m) return { type: 'reject', value: unescapeSieveString(m[1]) };
+
+  if (/^discard$/.test(s)) return { type: 'discard' };
+  if (/^keep$/.test(s)) return { type: 'keep' };
+  if (/^stop$/.test(s)) return { type: 'stop' };
+
+  return null;
+}
+
+function findBodyOpenBrace(s: string): number {
+  // Locate the first `{` that introduces the if-block body, skipping over
+  // string literals and comments. A naive indexOf('{') would otherwise pick
+  // up braces inside condition values (e.g. `:contains "{foo}"`).
+  let i = 0;
+  while (i < s.length) {
+    const c = s[i];
+    if (c === '"') { i = skipStringLit(s, i); continue; }
+    if (c === '#') { i = skipHashComment(s, i); continue; }
+    if (c === '/' && s[i + 1] === '*') { i = skipBlockComment(s, i); continue; }
+    if (c === '{') return i;
+    i++;
+  }
+  return -1;
+}
+
+function parseIfBlockToRule(block: TopBlock, idPrefix: string, index: number): FilterRule | null {
+  const stmt = block.statement;
+  const afterIf = stmt.replace(/^if\s+/, '');
+  const braceIdx = findBodyOpenBrace(afterIf);
+  // scanTopLevel's skipIfStatement uses balanced-brace scanning, so the
+  // statement always terminates at the matching `}`.
+  const lastBraceIdx = afterIf.length - 1;
+  if (braceIdx === -1 || afterIf[lastBraceIdx] !== '}' || lastBraceIdx < braceIdx) return null;
+
+  const condStr = afterIf.slice(0, braceIdx).trim();
+  const bodyStr = afterIf.slice(braceIdx + 1, lastBraceIdx).trim();
+
+  const cond = parseCondition(condStr);
+  if (!cond || cond.conditions.length === 0) return null;
+
+  const actionStmts = splitStatements(bodyStr);
+  const actions: FilterAction[] = [];
+  for (const st of actionStmts) {
+    const a = parseAction(st);
+    if (!a) return null;
+    actions.push(a);
+  }
+  if (actions.length === 0) return null;
+
+  let stopProcessing = false;
+  if (actions.length > 0 && actions[actions.length - 1].type === 'stop') {
+    const hasNonStop = actions.some(a => a.type !== 'stop');
+    if (hasNonStop) {
+      stopProcessing = true;
+      actions.pop();
+    }
+  }
+
+  const leading = block.raw.slice(0, block.statement ? block.raw.length - block.statement.length : 0);
+  const originLabel = detectOriginLabel(leading);
+  const name = extractName(leading, `Rule ${index + 1}`);
+
+  return {
+    id: `${idPrefix}-${index}`,
+    name,
+    enabled: true,
+    matchType: cond.matchType,
+    conditions: cond.conditions,
+    actions,
+    stopProcessing,
+    origin: 'external',
+    originLabel,
+    rawBlock: block.raw,
+  };
+}
+
+function makeOpaqueRule(block: TopBlock, idPrefix: string, index: number): FilterRule {
+  const leading = block.raw.slice(0, block.raw.length - block.statement.length);
+  const originLabel = detectOriginLabel(leading);
+  const name = extractName(leading, `External rule ${index + 1}`);
+  return {
+    id: `${idPrefix}-${index}`,
+    name,
+    enabled: true,
+    matchType: 'all',
+    conditions: [],
+    actions: [],
+    stopProcessing: false,
+    origin: 'opaque',
+    originLabel,
+    rawBlock: block.raw,
+  };
+}
+
+function escapeRegex(s: string): string {
+  return s.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
+}
+
+/**
+ * Nextcloud Mail wraps its managed filter region with a pair of
+ * `### Nextcloud Mail: Filters ### DON'T EDIT ###` markers and typically
+ * emits two such regions - one enclosing its own `require [...]` line and
+ * another enclosing the if-blocks it generates from its `# FILTER: [...]`
+ * JSON comments. Parsing the interior blocks individually loses the outer
+ * markers (causing later rules to fall back to "External") and mis-attaches
+ * them to neighboring blocks on round-trip.
+ *
+ * Treat each marker-pair as one opaque external rule so the whole region
+ * round-trips verbatim, merge any require tokens into the top-level list,
+ * and drop regions that carry nothing but a require (their extensions are
+ * already represented in the merged require line).
+ */
+function extractNextcloudRegions(content: string): {
+  cleaned: string;
+  rules: FilterRule[];
+  requires: string[];
+} {
+  const marker = NEXTCLOUD_BLOCK_MARKER;
+  const positions: number[] = [];
+  let searchFrom = 0;
+  while (true) {
+    const idx = content.indexOf(marker, searchFrom);
+    if (idx === -1) break;
+    const atLineStart = idx === 0 || content[idx - 1] === '\n';
+    if (atLineStart) positions.push(idx);
+    searchFrom = idx + marker.length;
+  }
+
+  if (positions.length < 2) {
+    return { cleaned: content, rules: [], requires: [] };
+  }
+
+  const rules: FilterRule[] = [];
+  const requires: string[] = [];
+  const markerRe = new RegExp(escapeRegex(marker), 'g');
+
+  let cleaned = '';
+  let cursor = 0;
+
+  for (let i = 0; i + 1 < positions.length; i += 2) {
+    const start = positions[i];
+    const closeStart = positions[i + 1];
+    const lineEnd = content.indexOf('\n', closeStart + marker.length);
+    const end = lineEnd === -1 ? content.length : lineEnd + 1;
+
+    cleaned += content.slice(cursor, start);
+    const raw = content.slice(start, end);
+
+    for (const m of raw.matchAll(/require\s+\[([\s\S]*?)\]\s*;/g)) {
+      for (const tok of m[1].matchAll(/"([^"]+)"/g)) {
+        if (!requires.includes(tok[1])) requires.push(tok[1]);
+      }
+    }
+    const singleReq = /require\s+"([^"]+)"\s*;/.exec(raw);
+    if (singleReq && !requires.includes(singleReq[1])) requires.push(singleReq[1]);
+
+    const stripped = raw
+      .replace(markerRe, '')
+      .replace(/require\s+\[[\s\S]*?\]\s*;/g, '')
+      .replace(/require\s+"[^"]+"\s*;/g, '')
+      .replace(/"(?:[^"\\]|\\.)*"/g, '""')
+      .replace(/#[^\n]*/g, '')
+      .replace(/\/\*[\s\S]*?\*\//g, '')
+      .trim();
+
+    if (stripped.length > 0) {
+      rules.push({
+        id: `nextcloud-${rules.length}`,
+        name: 'Nextcloud Mail filters',
+        enabled: true,
+        matchType: 'all',
+        conditions: [],
+        actions: [],
+        stopProcessing: false,
+        origin: 'opaque',
+        originLabel: 'Nextcloud',
+        rawBlock: raw,
+      });
+    }
+
+    cursor = end;
+  }
+
+  cleaned += content.slice(cursor);
+  return { cleaned, rules, requires };
+}
+
+function stripBulwarkExternalHeader(content: string): string {
+  return content.replace(BULWARK_EXTERNAL_HEADER_RE, '');
+}
+
+function parseExternalRules(
+  content: string,
+  idPrefix: string,
+): { rules: FilterRule[]; externalRequires: string[]; hasContent: boolean } {
+  const blocks = scanTopLevel(content);
+  const rules: FilterRule[] = [];
+  const externalRequires: string[] = [];
+  let index = 0;
+  let sawAnyStatement = false;
+
+  for (const block of blocks) {
+    if (block.kind === 'require') {
+      sawAnyStatement = true;
+      for (const tok of extractRequireTokens(block.statement)) {
+        if (!externalRequires.includes(tok)) externalRequires.push(tok);
+      }
+      continue;
+    }
+
+    if (block.kind === 'if') {
+      sawAnyStatement = true;
+      const rule = parseIfBlockToRule(block, idPrefix, index);
+      rules.push(rule ?? makeOpaqueRule(block, idPrefix, index));
+      index++;
+      continue;
+    }
+
+    // vacation/other: treat as opaque preserved block
+    sawAnyStatement = true;
+    rules.push(makeOpaqueRule(block, idPrefix, index));
+    index++;
+  }
+
+  return { rules, externalRequires, hasContent: sawAnyStatement };
+}
+
+export function parseScript(content: string): ParseResult {
+  const beginIdx = content.indexOf(METADATA_BEGIN);
+
+  if (beginIdx !== -1) {
+    const endIdx = content.indexOf(METADATA_END, beginIdx);
+    if (endIdx === -1) return OPAQUE;
+
+    const jsonStart = beginIdx + METADATA_BEGIN.length;
+    const jsonStr = content.slice(jsonStart, endIdx).trim();
+
+    let metadata: FilterMetadata;
+    try {
+      metadata = JSON.parse(jsonStr);
+    } catch (e) {
+      console.warn('[filters] Failed to parse Sieve metadata JSON:', e);
+      return OPAQUE;
+    }
+
+    if (!metadata || metadata.version !== 1) return OPAQUE;
+    if (!Array.isArray(metadata.rules)) return OPAQUE;
+
+    for (const rule of metadata.rules) {
+      if (!isValidRule(rule)) return OPAQUE;
+    }
+
+    // Scan the portion AFTER the metadata block for external rules. A prior
+    // Bulwark save may have emitted its "External rules" header here; strip
+    // it so it does not get re-attached to the first external rule's rawBlock
+    // and written out twice on the next save.
+    const afterMetadata = stripBulwarkExternalHeader(
+      content.slice(endIdx + METADATA_END.length),
+    );
+    const nextcloud = extractNextcloudRegions(afterMetadata);
+    const external = parseExternalRules(nextcloud.cleaned, 'ext');
+
+    // Parsed bulwark rules intentionally omit an explicit `origin` field so
+    // round-trip equality with metadata-only callers holds. Absence of origin
+    // is treated as 'bulwark' everywhere downstream.
+    const bulwarkRules: FilterRule[] = metadata.rules;
+
+    const externalRequires = [
+      ...external.externalRequires,
+      ...nextcloud.requires.filter(r => !external.externalRequires.includes(r)),
+    ];
+
+    // Drop any external "rules" that are really the bulwark-managed if-blocks or vacation.
+    // Recognizable by the leading comment "# Rule: <name>" or "# Vacation auto-reply".
+    // This applies regardless of whether the block parsed as a structured rule or
+    // fell back to opaque - a Bulwark-emitted block may fail to round-trip cleanly
+    // (e.g. a value with literal braces) but the `# Rule: <name>` marker still
+    // identifies it as ours.
+    const filteredExternal = external.rules.filter(r => {
+      const raw = r.rawBlock || '';
+      const match = raw.match(/#\s*Rule:\s*(.+?)\s*$/m);
+      if (match) {
+        const name = match[1].trim();
+        if (bulwarkRules.some(b => b.name === name)) return false;
+      }
+      if (/#\s*Vacation auto-reply/i.test(raw)) return false;
+      return true;
+    });
+
+    return {
+      rules: [...bulwarkRules, ...nextcloud.rules, ...filteredExternal],
+      isOpaque: false,
+      vacation: metadata.vacation,
+      externalRequires,
+    };
+  }
+
+  // No metadata - check vacation-only first
+  const vacationOnly = detectVacationOnlyScript(content);
+  if (vacationOnly) return vacationOnly;
+
+  // Extract Nextcloud-managed marker regions first so their interior is not
+  // parsed as a series of loose if-blocks (which would lose the outer markers
+  // and mis-label later blocks as generic "External").
+  const nextcloud = extractNextcloudRegions(content);
+  const external = parseExternalRules(nextcloud.cleaned, 'ext');
+
+  const allRules = [...nextcloud.rules, ...external.rules];
+  const allRequires = [
+    ...external.externalRequires,
+    ...nextcloud.requires.filter(r => !external.externalRequires.includes(r)),
+  ];
+
+  if (!external.hasContent && allRules.length === 0) {
+    // Entirely empty or whitespace/comments only - treat as empty, editable.
+    // Preserve any require tokens lifted out of Nextcloud marker regions so
+    // they can be re-emitted in the top-level require line.
+    return { rules: [], isOpaque: false, externalRequires: allRequires };
+  }
+
+  // If at least one block parsed into a structured rule, expose them as external.
+  const anyParsed = external.rules.some(r => r.origin === 'external');
+  if (anyParsed || allRules.length > 0) {
+    return { rules: allRules, isOpaque: false, externalRequires: allRequires };
+  }
+
+  return OPAQUE;
+}

src/lib/sieve/types.ts

@@ -0,0 +1,72 @@
+// Sieve filter data model. Ported from the webmail's lib/jmap/sieve-types.ts so
+// the generated scripts round-trip byte-for-byte between the two clients (a
+// rule authored on the web reads back as a structured rule on mobile and vice
+// versa, because both embed the same `@metadata` JSON block).
+
+export interface SieveScript {
+  id: string;
+  name: string;
+  blobId: string;
+  isActive: boolean;
+}
+
+export interface SieveCapabilities {
+  implementation: string;
+  maxSizeScript: number;
+  sieveExtensions: string[];
+  notificationMethods: string[];
+  externalLists: string[];
+}
+
+export type FilterConditionField = 'from' | 'to' | 'cc' | 'subject' | 'header' | 'size' | 'body';
+
+export type FilterComparator =
+  | 'contains' | 'not_contains'
+  | 'is' | 'not_is'
+  | 'starts_with' | 'ends_with'
+  | 'matches'
+  | 'greater_than' | 'less_than';
+
+export type FilterActionType =
+  | 'move' | 'copy' | 'forward'
+  | 'mark_read' | 'star' | 'add_label'
+  | 'discard' | 'reject' | 'keep' | 'stop';
+
+export interface FilterCondition {
+  field: FilterConditionField;
+  comparator: FilterComparator;
+  value: string;
+  headerName?: string;
+}
+
+export interface FilterAction {
+  type: FilterActionType;
+  value?: string;
+}
+
+export type FilterOrigin = 'bulwark' | 'external' | 'opaque';
+
+export interface FilterRule {
+  id: string;
+  name: string;
+  enabled: boolean;
+  matchType: 'all' | 'any';
+  conditions: FilterCondition[];
+  actions: FilterAction[];
+  stopProcessing: boolean;
+  origin?: FilterOrigin;
+  originLabel?: string;
+  rawBlock?: string;
+}
+
+export interface VacationSieveConfig {
+  isEnabled: boolean;
+  subject: string;
+  textBody: string;
+}
+
+export interface FilterMetadata {
+  version: 1;
+  rules: FilterRule[];
+  vacation?: VacationSieveConfig;
+}

src/lib/totp.ts

@@ -0,0 +1,95 @@
+// TOTP enrolment helper. Mirrors the webmail's use of `otpauth` (Settings →
+// Security → Two-Factor) but without pulling in a native crypto dependency:
+// we only need to mint a fresh shared secret and the `otpauth://` enrolment
+// URL. The 6-digit code the user types is verified server-side by Stalwart
+// (x:AccountPassword/set with otpAuth.otpCode), so we never run HMAC-SHA1 on
+// device — that keeps this file dependency-free.
+
+const BASE32_ALPHABET = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ234567';
+
+// 20 bytes = 160 bits, matching the webmail's `new OTPAuth.Secret({ size: 20 })`
+// and the SHA-1 HMAC block expectation of virtually every authenticator app.
+const SECRET_BYTES = 20;
+
+function randomBytes(length: number): Uint8Array {
+  const bytes = new Uint8Array(length);
+  const c = (globalThis as {
+    crypto?: { getRandomValues?: (a: Uint8Array) => Uint8Array; randomUUID?: () => string };
+  }).crypto;
+
+  // Best: a real CSPRNG (web / a polyfilled RN).
+  if (c?.getRandomValues) {
+    try {
+      c.getRandomValues(bytes);
+      return bytes;
+    } catch {
+      // fall through
+    }
+  }
+
+  // Good enough: derive bytes from crypto.randomUUID, which Hermes exposes
+  // even when getRandomValues isn't polyfilled (~122 bits of entropy each).
+  if (c?.randomUUID) {
+    try {
+      let hex = '';
+      while (hex.length < length * 2) hex += c.randomUUID().replace(/-/g, '');
+      for (let i = 0; i < length; i++) bytes[i] = parseInt(hex.slice(i * 2, i * 2 + 2), 16);
+      return bytes;
+    } catch {
+      // fall through
+    }
+  }
+
+  // Last resort: Math.random. Same trade-off the rest of the app accepts in
+  // lib/uuid.ts and lib/oauth.ts; the secret is one-off and server-validated.
+  for (let i = 0; i < length; i++) bytes[i] = Math.floor(Math.random() * 256);
+  return bytes;
+}
+
+// RFC 4648 base32, no padding — the form authenticator apps expect in the
+// `secret` query parameter.
+function base32Encode(bytes: Uint8Array): string {
+  let bits = 0;
+  let value = 0;
+  let output = '';
+  for (let i = 0; i < bytes.length; i++) {
+    value = (value << 8) | bytes[i];
+    bits += 8;
+    while (bits >= 5) {
+      output += BASE32_ALPHABET[(value >>> (bits - 5)) & 31];
+      bits -= 5;
+    }
+  }
+  if (bits > 0) {
+    output += BASE32_ALPHABET[(value << (5 - bits)) & 31];
+  }
+  return output;
+}
+
+export interface TotpEnrolment {
+  // Base32 secret, shown to the user for manual entry.
+  secret: string;
+  // Same secret grouped in fours for easier manual typing.
+  secretFormatted: string;
+  // otpauth:// URL — feeds the "Add to authenticator app" deep link and the
+  // value sent to the server as otpUrl.
+  url: string;
+}
+
+export function generateTotpEnrolment(accountLabel: string): TotpEnrolment {
+  const secret = base32Encode(randomBytes(SECRET_BYTES));
+  const issuer = 'Stalwart';
+  const label = accountLabel || 'account';
+  const params = new URLSearchParams({
+    secret,
+    issuer,
+    algorithm: 'SHA1',
+    digits: '6',
+    period: '30',
+  });
+  // Label is conventionally "Issuer:account"; both label path and issuer param
+  // are encoded so authenticators that read either render a sensible name.
+  const url = `otpauth://totp/${encodeURIComponent(issuer)}:${encodeURIComponent(label)}?${params.toString()}`;
+  const secretFormatted = secret.replace(/(.{4})/g, '$1 ').trim();
+  return { secret, secretFormatted, url };
+}

src/lib/uuid.ts

@@ -0,0 +1,20 @@
+// RFC 4122 v4 UUID generator. Prefers the platform crypto.randomUUID when
+// available (Hermes/React Native 0.81 exposes it), falling back to a
+// Math.random implementation. These IDs are only used as temporary client-side
+// keys (e.g. parsed-vCard import rows) before the server assigns real ids, so
+// the Math.random fallback's weaker entropy is acceptable.
+export function generateUUID(): string {
+  const c = (globalThis as { crypto?: { randomUUID?: () => string } }).crypto;
+  if (c?.randomUUID) {
+    try {
+      return c.randomUUID();
+    } catch {
+      // fall through to the manual implementation
+    }
+  }
+  return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, (ch) => {
+    const r = (Math.random() * 16) | 0;
+    const v = ch === 'x' ? r : (r & 0x3) | 0x8;
+    return v.toString(16);
+  });
+}

src/navigation/types.ts

@@ -2,7 +2,7 @@ import type { EmailAddress } from '../api/types';
 
 export type RootStackParamList = {
   MainTabs: undefined;
-  EmailThread: { emailId: string; threadId: string; subject?: string };
+  EmailThread: { emailId: string; threadId: string; subject?: string; jmapAccountId?: string };
   EmailSource: { emailId: string; blobId: string; subject?: string };
   Compose:
     | {
@@ -13,6 +13,7 @@ export type RootStackParamList = {
           cc?: EmailAddress[];
           subject: string;
           body?: string;
+          receivedAt?: string;
           inReplyTo?: string;
           references?: string;
         };
@@ -23,6 +24,8 @@ export type RootStackParamList = {
   ContactForm: { contactId?: string; addressBookId?: string; asGroup?: boolean };
   GroupDetail: { groupId: string };
   AddAccount: undefined;
+  Scheduled: undefined;
+  UnifiedInbox: undefined;
 };
 
 export type MainTabsParamList = {

src/screens/CalendarScreen.tsx

@@ -16,6 +16,7 @@ import {
   CalendarDays,
   LayoutGrid,
   List as ListIcon,
+  ListChecks,
   Menu,
 } from 'lucide-react-native';
 import {
@@ -47,11 +48,21 @@ import {
   type RecurrenceEditScope,
 } from '../components/calendar/RecurrenceScopeDialog';
 import { CalendarSidebarDrawer } from '../components/calendar/CalendarSidebarDrawer';
+import { TasksSheet } from '../components/calendar/TasksSheet';
+import { ICalImportSheet } from '../components/calendar/ICalImportSheet';
+import { ICalSubscriptionSheet } from '../components/calendar/ICalSubscriptionSheet';
 import {
+  applySharedCalendarColors,
   buildEventDayIndex,
   eventsOnDayFromIndex,
+  pickUnusedCalendarColor,
+  sharedCalendarColorKey,
   type EventDayIndex,
+  type TimeFormat,
 } from '../lib/calendar-utils';
+import { buildReplyTo } from '../lib/calendar-invitation';
+import { generateBirthdayEvents, createBirthdayCalendar, BIRTHDAY_CALENDAR_ID } from '../lib/birthday-calendar';
+import { useContactsStore } from '../stores/contacts-store';
 import type { Calendar, CalendarEvent } from '../api/types';
 
 type ViewMode = 'month' | 'week' | 'agenda';
@@ -108,6 +119,12 @@ export default function CalendarScreen() {
   const calendarFirstDayOfWeek = useSettingsStore((s) => s.calendarFirstDayOfWeek);
   const calendarShowWeekNumbers = useSettingsStore((s) => s.calendarShowWeekNumbers);
   const calendarTimeFormat = useSettingsStore((s) => s.calendarTimeFormat);
+  const showBirthdayCalendar = useSettingsStore((s) => s.showBirthdayCalendar);
+  const enableCalendarTasks = useSettingsStore((s) => s.enableCalendarTasks);
+  const sharedCalendarColors = useSettingsStore((s) => s.sharedCalendarColors);
+  const setSharedCalendarColor = useSettingsStore((s) => s.setSharedCalendarColor);
+  const removeSharedCalendarColor = useSettingsStore((s) => s.removeSharedCalendarColor);
+  const contacts = useContactsStore((s) => s.contacts);
 
   const [currentDate, setCurrentDate] = React.useState(new Date());
   const [selectedDate, setSelectedDate] = React.useState(new Date());
@@ -125,6 +142,9 @@ export default function CalendarScreen() {
   const [modalVisible, setModalVisible] = React.useState(false);
   const [pendingAction, setPendingAction] = React.useState<PendingAction>(null);
   const [sidebarVisible, setSidebarVisible] = React.useState(false);
+  const [tasksVisible, setTasksVisible] = React.useState(false);
+  const [importVisible, setImportVisible] = React.useState(false);
+  const [subscriptionsVisible, setSubscriptionsVisible] = React.useState(false);
   const [refreshing, setRefreshing] = React.useState(false);
 
   const hydrate = useCalendarStore((s) => s.hydrate);
@@ -134,12 +154,69 @@ export default function CalendarScreen() {
   const createEvent = useCalendarStore((s) => s.createEvent);
   const updateEvent = useCalendarStore((s) => s.updateEvent);
   const deleteEvent = useCalendarStore((s) => s.deleteEvent);
+  const rsvpEvent = useCalendarStore((s) => s.rsvpEvent);
+  const importEvents = useCalendarStore((s) => s.importEvents);
+  const tasks = useCalendarStore((s) => s.tasks);
+  const createTask = useCalendarStore((s) => s.createTask);
+  const toggleTaskComplete = useCalendarStore((s) => s.toggleTaskComplete);
+  const deleteTask = useCalendarStore((s) => s.deleteTask);
   const toggleCalendarVisibility = useCalendarStore((s) => s.toggleCalendarVisibility);
-  const allCalendars = useCalendarStore((s) => s.calendars);
+  const setDefaultCalendar = useCalendarStore((s) => s.setDefaultCalendar);
+  const storeCalendars = useCalendarStore((s) => s.calendars);
   const hiddenCalendarIds = useCalendarStore((s) => s.hiddenCalendarIds);
   const loading = useCalendarStore((s) => s.loading);
   const error = useCalendarStore((s) => s.error);
-  const allEvents = useCalendarStore((s) => s.events);
+  const storeEvents = useCalendarStore((s) => s.events);
+
+  // The birthday calendar is a client-side virtual calendar: its events are
+  // generated from contacts for the visible range and merged in alongside the
+  // server calendars. Toggling it on/off is instant (no refetch).
+  const birthdayEvents = React.useMemo(() => {
+    if (!showBirthdayCalendar) return [];
+    const { after, before } = rangeForView(viewMode, currentDate, calendarFirstDayOfWeek);
+    return generateBirthdayEvents(contacts, after.toISOString(), before.toISOString());
+  }, [showBirthdayCalendar, contacts, viewMode, currentDate, calendarFirstDayOfWeek]);
+
+  // Per-viewer recolor (#345): shared calendars get the viewer's local color
+  // override applied before anything renders. Personal calendars pass through.
+  const displayCalendars = React.useMemo(
+    () => applySharedCalendarColors(storeCalendars, sharedCalendarColors),
+    [storeCalendars, sharedCalendarColors],
+  );
+
+  // Auto-assign a random, not-yet-used palette color to any freshly shared
+  // calendar so multiple shared calendars don't collide on one color. Runs
+  // once per calendar (guarded by the presence of an existing key), and the
+  // user can still overwrite it from the sidebar.
+  React.useEffect(() => {
+    const missing = storeCalendars.filter(
+      (cal) => cal.isShared && !sharedCalendarColors[sharedCalendarColorKey(cal)],
+    );
+    if (missing.length === 0) return;
+    // Seed "used" with personal calendar colors plus already-assigned shared
+    // overrides so the picks stay distinct from what's already on screen.
+    const used = new Set<string>();
+    for (const cal of storeCalendars) {
+      if (!cal.isShared && cal.color) used.add(cal.color.toLowerCase());
+    }
+    for (const color of Object.values(sharedCalendarColors)) {
+      if (color) used.add(color.toLowerCase());
+    }
+    for (const cal of missing) {
+      const color = pickUnusedCalendarColor(used);
+      used.add(color.toLowerCase());
+      setSharedCalendarColor(sharedCalendarColorKey(cal), color);
+    }
+  }, [storeCalendars, sharedCalendarColors, setSharedCalendarColor]);
+
+  const allCalendars = React.useMemo(
+    () => (showBirthdayCalendar ? [...displayCalendars, createBirthdayCalendar()] : displayCalendars),
+    [displayCalendars, showBirthdayCalendar],
+  );
+  const allEvents = React.useMemo(
+    () => (birthdayEvents.length > 0 ? [...storeEvents, ...birthdayEvents] : storeEvents),
+    [storeEvents, birthdayEvents],
+  );
 
   const calendars = React.useMemo(
     () => allCalendars.filter((c) => !hiddenCalendarIds.includes(c.id)),
@@ -210,23 +287,39 @@ export default function CalendarScreen() {
     setModalVisible(true);
   }, []);
 
+  const isReadOnlyEvent = React.useCallback(
+    (event: CalendarEvent) => !!event.calendarIds?.[BIRTHDAY_CALENDAR_ID],
+    [],
+  );
+
+  // A recurring series member is a master (has recurrenceRules) or an expanded
+  // occurrence (has recurrenceId) — those get the this/all scope dialog. Note:
+  // we must NOT key off originalId here, since shared/group events now carry it
+  // for id-namespacing even when they aren't recurring.
+  const isRecurringSeriesMember = React.useCallback(
+    (event: CalendarEvent) => !!event.recurrenceRules?.length || !!event.recurrenceId,
+    [],
+  );
+
   const handleEditFromDetail = React.useCallback((event: CalendarEvent) => {
+    if (isReadOnlyEvent(event)) { setDetailEvent(null); return; }
     setDetailEvent(null);
-    if (event.recurrenceRules?.length || event.originalId) {
+    if (isRecurringSeriesMember(event)) {
       setPendingAction({ kind: 'edit', event });
     } else {
       openEditDirect(event);
     }
-  }, [openEditDirect]);
+  }, [openEditDirect, isReadOnlyEvent, isRecurringSeriesMember]);
 
   const handleDeleteFromDetail = React.useCallback((event: CalendarEvent) => {
+    if (isReadOnlyEvent(event)) { setDetailEvent(null); return; }
     setDetailEvent(null);
-    if (event.recurrenceRules?.length || event.originalId) {
+    if (isRecurringSeriesMember(event)) {
       setPendingAction({ kind: 'delete', event });
     } else {
       void deleteEvent(event.id);
     }
-  }, [deleteEvent]);
+  }, [deleteEvent, isReadOnlyEvent, isRecurringSeriesMember]);
 
   const handleScopeSelect = React.useCallback(
     async (scope: RecurrenceEditScope) => {
@@ -293,6 +386,15 @@ export default function CalendarScreen() {
           </Text>
         </View>
         <View style={styles.headerActions}>
+          {enableCalendarTasks && (
+            <Pressable
+              style={styles.headerBtn}
+              onPress={() => setTasksVisible(true)}
+              hitSlop={6}
+            >
+              <ListChecks size={20} color={c.text} />
+            </Pressable>
+          )}
           <View style={styles.viewToggle}>
             {(['month', 'week', 'agenda'] as ViewMode[]).map((mode) => {
               const Icon =
@@ -367,6 +469,7 @@ export default function CalendarScreen() {
             events={events}
             eventsByDay={eventsByDay}
             calendars={calendars}
+            timeFormat={calendarTimeFormat}
             onSelectEvent={setDetailEvent}
           />
         )}
@@ -383,6 +486,7 @@ export default function CalendarScreen() {
               date={selectedDate}
               eventsByDay={eventsByDay}
               calendars={calendars}
+              timeFormat={calendarTimeFormat}
               onSelectEvent={setDetailEvent}
               refreshing={refreshing}
               onRefresh={onRefresh}
@@ -394,9 +498,24 @@ export default function CalendarScreen() {
       <EventDetailSheet
         event={detailEvent}
         calendars={calendars}
+        timeFormat={calendarTimeFormat}
         onClose={() => setDetailEvent(null)}
         onEdit={handleEditFromDetail}
         onDelete={handleDeleteFromDetail}
+        onRsvp={async (ev, participantId, status) => {
+          await rsvpEvent(ev.id, participantId, status, buildReplyTo(ev));
+          setDetailEvent((cur) =>
+            cur && cur.id === ev.id && cur.participants?.[participantId]
+              ? {
+                  ...cur,
+                  participants: {
+                    ...cur.participants,
+                    [participantId]: { ...cur.participants[participantId], participationStatus: status },
+                  },
+                }
+              : cur,
+          );
+        }}
       />
 
       <EventModal
@@ -422,6 +541,39 @@ export default function CalendarScreen() {
         hiddenCalendarIds={hiddenCalendarIds}
         onToggle={toggleCalendarVisibility}
         onClose={() => setSidebarVisible(false)}
+        onImport={() => { setSidebarVisible(false); setImportVisible(true); }}
+        onManageSubscriptions={() => { setSidebarVisible(false); setSubscriptionsVisible(true); }}
+        onSetDefault={(cal) => { void setDefaultCalendar(cal.id); }}
+        onSetColor={(cal, color) => setSharedCalendarColor(sharedCalendarColorKey(cal), color)}
+        onResetColor={(cal) => {
+          // Drop the local override; the auto-assign effect picks a fresh
+          // unused color (so it never reverts to a collision).
+          removeSharedCalendarColor(sharedCalendarColorKey(cal));
+        }}
+      />
+
+      <TasksSheet
+        visible={tasksVisible}
+        tasks={tasks}
+        calendars={allCalendars}
+        onClose={() => setTasksVisible(false)}
+        onCreate={createTask}
+        onToggle={toggleTaskComplete}
+        onDelete={deleteTask}
+      />
+
+      <ICalImportSheet
+        visible={importVisible}
+        // Import batch-creates against the primary account, so only offer the
+        // user's own calendars as targets.
+        calendars={displayCalendars.filter((cal) => !cal.isShared)}
+        onClose={() => setImportVisible(false)}
+        onImport={importEvents}
+      />
+
+      <ICalSubscriptionSheet
+        visible={subscriptionsVisible}
+        onClose={() => setSubscriptionsVisible(false)}
       />
     </SafeAreaView>
   );
@@ -431,6 +583,7 @@ function DayEventList({
   date,
   eventsByDay,
   calendars,
+  timeFormat,
   onSelectEvent,
   refreshing,
   onRefresh,
@@ -438,6 +591,7 @@ function DayEventList({
   date: Date;
   eventsByDay: EventDayIndex;
   calendars: Calendar[];
+  timeFormat?: TimeFormat;
   onSelectEvent?: (event: CalendarEvent) => void;
   refreshing: boolean;
   onRefresh: () => void;
@@ -474,6 +628,7 @@ function DayEventList({
           key={event.id}
           event={event}
           calendars={calendars}
+          timeFormat={timeFormat}
           onPress={onSelectEvent}
         />
       ))}

src/screens/ComposeScreen.tsx

@@ -9,8 +9,9 @@ import {
   X, Send, Paperclip, ChevronDown, Bold, Italic, Underline, Strikethrough,
   List, ListOrdered, Link2, Link2Off, Image as ImageIcon, Quote,
   Heading1, Heading2, AlignLeft, AlignCenter, AlignRight, RemoveFormatting,
-  Undo2, Redo2, FileText,
+  Undo2, Redo2, FileText, Clock, Check,
 } from 'lucide-react-native';
+import DateTimePicker, { type DateTimePickerEvent } from '@react-native-community/datetimepicker';
 import * as ImagePicker from 'expo-image-picker';
 import * as FileSystem from 'expo-file-system/legacy';
 import { File as FsFile } from 'expo-file-system';
@@ -33,6 +34,7 @@ import {
 } from '../lib/contact-utils';
 import { getIdentities } from '../api/identity';
 import { sendEmail, type OutgoingAttachment } from '../api/email';
+import { jmapClient } from '../api/jmap-client';
 import { uploadBlob } from '../api/blob';
 import { buildInitialHtml, htmlToPlainText, rewriteInlineImages } from '../lib/compose-html';
 import { stripDangerousTags } from '../lib/email-html';
@@ -210,6 +212,8 @@ export default function ComposeScreen({ route, navigation }: Props) {
   const c = useColors();
   const styles = React.useMemo(() => makeStyles(c), [c]);
   const t = useLocaleStore((s) => s.t);
+  const locale = useLocaleStore((s) => s.locale);
+  const timeFormat = useSettingsStore((s) => s.timeFormat);
   const insets = useSafeAreaInsets();
   // Track the visible keyboard obstruction so the format bar stays above it.
   // On Android edge-to-edge, the IME-inset reported by `keyboardDidShow` is
@@ -256,11 +260,17 @@ export default function ComposeScreen({ route, navigation }: Props) {
   const [identityError, setIdentityError] = React.useState<string | null>(null);
   const [sending, setSending] = React.useState(false);
   const [selectedIdentityId, setSelectedIdentityId] = React.useState<string | null>(null);
+  const [scheduleSheetOpen, setScheduleSheetOpen] = React.useState(false);
+  // Custom date/time picker stage. iOS shows one 'datetime' spinner; Android
+  // can only show one field at a time, so we walk date → time.
+  const [customStage, setCustomStage] = React.useState<'datetime' | 'date' | 'time' | null>(null);
+  const customDraftRef = React.useRef<Date>(new Date());
 
   const autoSelectReplyIdentity = useSettingsStore((s) => s.autoSelectReplyIdentity);
   const plainTextMode = useSettingsStore((s) => s.plainTextMode);
   const attachmentReminderEnabled = useSettingsStore((s) => s.attachmentReminderEnabled);
   const attachmentReminderKeywords = useSettingsStore((s) => s.attachmentReminderKeywords);
+  const sendDelaySeconds = useSettingsStore((s) => s.sendDelaySeconds);
 
   const initialTo = React.useMemo<Recipient[]>(() => {
     if (!replyTo) {
@@ -309,10 +319,12 @@ export default function ComposeScreen({ route, navigation }: Props) {
           cc: replyTo.cc,
           subject: replyTo.subject,
           body: replyTo.body,
+          receivedAt: replyTo.receivedAt,
         }
       : null,
+      { timeFormat, locale, unknownLabel: t('common.unknown', 'Unknown') },
     ),
-    [mode, replyTo],
+    [mode, replyTo, timeFormat, locale, t],
   );
 
   const [toRecipients, setToRecipients] = React.useState<Recipient[]>(initialTo);
@@ -737,7 +749,96 @@ export default function ComposeScreen({ route, navigation }: Props) {
     });
   };
 
-  const onSend = async () => {
+  // Translate an absolute "send at" time into the HOLDFOR seconds the server
+  // expects, clamping to what it actually supports. Returns null (and alerts)
+  // when scheduling isn't possible so the caller can abort.
+  const resolveHoldForScheduledAt = (date: Date): number | null => {
+    const seconds = Math.ceil((date.getTime() - Date.now()) / 1000);
+    if (seconds <= 0) {
+      Alert.alert(
+        t('email_composer.schedule_past_title', 'Pick a future time'),
+        t('email_composer.schedule_past_body', 'The scheduled time must be in the future.'),
+      );
+      return null;
+    }
+    if (!jmapClient.hasDelayedSend()) {
+      Alert.alert(
+        t('email_composer.schedule_unsupported_title', 'Scheduling unavailable'),
+        t('email_composer.schedule_unsupported_body', 'This mail server does not support scheduled send.'),
+      );
+      return null;
+    }
+    const max = jmapClient.getMaxDelayedSend();
+    if (max > 0 && seconds > max) {
+      Alert.alert(
+        t('email_composer.schedule_too_late_title', 'Too far ahead'),
+        t('email_composer.schedule_too_late_body', 'That is later than this server allows. Pick an earlier time.'),
+      );
+      return null;
+    }
+    return seconds;
+  };
+
+  // The Send button: applies the global undo-send delay when the server
+  // supports it, otherwise sends immediately.
+  const onSend = () => {
+    const holdFor = sendDelaySeconds > 0 && jmapClient.hasDelayedSend() ? sendDelaySeconds : undefined;
+    void performSend(holdFor);
+  };
+
+  const onScheduleConfirm = (date: Date) => {
+    const holdFor = resolveHoldForScheduledAt(date);
+    if (holdFor == null) return;
+    setScheduleSheetOpen(false);
+    void performSend(holdFor, date);
+  };
+
+  const schedulePresets = React.useMemo(() => {
+    const now = new Date();
+    const inHours = (h: number) => new Date(now.getTime() + h * 3600 * 1000);
+    const tomorrowMorning = new Date(now);
+    tomorrowMorning.setDate(tomorrowMorning.getDate() + 1);
+    tomorrowMorning.setHours(8, 0, 0, 0);
+    return [
+      { label: t('email_composer.schedule_in_1h', 'In 1 hour'), date: inHours(1) },
+      { label: t('email_composer.schedule_in_3h', 'In 3 hours'), date: inHours(3) },
+      { label: t('email_composer.schedule_tomorrow', 'Tomorrow, 8:00 AM'), date: tomorrowMorning },
+    ];
+  }, [t, scheduleSheetOpen]);
+
+  const startCustomPicker = () => {
+    customDraftRef.current = new Date(Date.now() + 3600 * 1000);
+    setScheduleSheetOpen(false);
+    setCustomStage(Platform.OS === 'ios' ? 'datetime' : 'date');
+  };
+
+  const onCustomPickerChange = (event: DateTimePickerEvent, selected?: Date) => {
+    if (event.type === 'dismissed' || !selected) {
+      setCustomStage(null);
+      return;
+    }
+    if (Platform.OS === 'ios') {
+      // Single spinner — keep it open, just remember the latest value.
+      customDraftRef.current = selected;
+      return;
+    }
+    // Android: combine the date step with the existing time, then ask for time.
+    if (customStage === 'date') {
+      const d = new Date(customDraftRef.current);
+      d.setFullYear(selected.getFullYear(), selected.getMonth(), selected.getDate());
+      customDraftRef.current = d;
+      setCustomStage('time');
+      return;
+    }
+    if (customStage === 'time') {
+      const d = new Date(customDraftRef.current);
+      d.setHours(selected.getHours(), selected.getMinutes(), 0, 0);
+      setCustomStage(null);
+      onScheduleConfirm(d);
+    }
+  };
+
+  const performSend = async (holdForSeconds?: number, scheduledAt?: Date) => {
     if (!canSend || !primaryIdentity || !sentMailbox) return;
     if (!(await passesAttachmentReminder())) return;
     setSending(true);
@@ -775,7 +876,7 @@ export default function ComposeScreen({ route, navigation }: Props) {
 
       const outgoing = [...inlineFromBody, ...fileAttachments];
 
-      await sendEmail(
+      const result = await sendEmail(
         {
           from,
           to: finalTo.map((r) => ({ name: r.name || undefined, email: r.email })),
@@ -793,7 +894,21 @@ export default function ComposeScreen({ route, navigation }: Props) {
         },
         primaryIdentity.id,
         sentMailbox.id,
+        holdForSeconds,
       );
+      // Confirm an explicit "send later" so the user knows it didn't go out
+      // now. The brief undo-send delay stays silent — it's meant to be
+      // invisible unless the user cancels from the Scheduled view.
+      if (scheduledAt && result.scheduled) {
+        const when = result.sendAt ? new Date(result.sendAt) : scheduledAt;
+        Alert.alert(
+          t('email_composer.scheduled_title', 'Scheduled'),
+          t('email_composer.scheduled_body', 'Your message will be sent at {time}.').replace(
+            '{time}',
+            when.toLocaleString(),
+          ),
+        );
+      }
       navigation.goBack();
     } catch (e) {
       Alert.alert(
@@ -828,10 +943,18 @@ export default function ComposeScreen({ route, navigation }: Props) {
           >
             <Paperclip size={20} color={c.text} />
           </Pressable>
+          <Pressable
+            onPress={() => setScheduleSheetOpen(true)}
+            style={styles.headerBtn}
+            hitSlop={8}
+            disabled={!canSend}
+          >
+            <Clock size={20} color={canSend ? c.text : c.textMuted} />
+          </Pressable>
           <Button
             variant="default"
             size="sm"
-            onPress={() => { void onSend(); }}
+            onPress={onSend}
             disabled={!canSend}
             icon={
               sending ? (
@@ -1083,6 +1206,93 @@ export default function ComposeScreen({ route, navigation }: Props) {
           </View>
         </View>
       </Modal>
+
+      {/* Schedule send sheet */}
+      <Modal
+        visible={scheduleSheetOpen}
+        transparent
+        animationType="fade"
+        onRequestClose={() => setScheduleSheetOpen(false)}
+      >
+        <Pressable style={styles.modalBackdrop} onPress={() => setScheduleSheetOpen(false)}>
+          <Pressable style={styles.scheduleCard} onPress={() => {}}>
+            <Text style={styles.modalTitle}>
+              {t('email_composer.schedule_send', 'Schedule send')}
+            </Text>
+            {!jmapClient.hasDelayedSend() && (
+              <Text style={styles.scheduleWarning}>
+                {t('email_composer.schedule_unsupported_body', 'This mail server does not support scheduled send.')}
+              </Text>
+            )}
+            {schedulePresets.map((preset) => (
+              <Pressable
+                key={preset.label}
+                style={styles.scheduleRow}
+                onPress={() => onScheduleConfirm(preset.date)}
+              >
+                <Clock size={16} color={c.textSecondary} />
+                <Text style={styles.scheduleRowLabel}>{preset.label}</Text>
+                <Text style={styles.scheduleRowTime}>
+                  {preset.date.toLocaleString(undefined, {
+                    weekday: 'short', hour: 'numeric', minute: '2-digit',
+                  })}
+                </Text>
+              </Pressable>
+            ))}
+            <Pressable style={styles.scheduleRow} onPress={startCustomPicker}>
+              <Check size={16} color={c.textSecondary} />
+              <Text style={styles.scheduleRowLabel}>
+                {t('email_composer.schedule_custom', 'Pick date & time…')}
+              </Text>
+            </Pressable>
+            <Pressable
+              style={styles.scheduleCancel}
+              onPress={() => setScheduleSheetOpen(false)}
+            >
+              <Text style={styles.modalCancelText}>{t('email_composer.cancel', 'Cancel')}</Text>
+            </Pressable>
+          </Pressable>
+        </Pressable>
+      </Modal>
+
+      {customStage !== null && Platform.OS === 'ios' && (
+        <Modal transparent animationType="fade" onRequestClose={() => setCustomStage(null)}>
+          <Pressable style={styles.modalBackdrop} onPress={() => setCustomStage(null)}>
+            <Pressable style={styles.scheduleCard} onPress={() => {}}>
+              <DateTimePicker
+                value={customDraftRef.current}
+                mode="datetime"
+                display="spinner"
+                minimumDate={new Date()}
+                onChange={onCustomPickerChange}
+              />
+              <View style={styles.modalActions}>
+                <Pressable style={styles.modalCancel} onPress={() => setCustomStage(null)}>
+                  <Text style={styles.modalCancelText}>{t('email_composer.cancel', 'Cancel')}</Text>
+                </Pressable>
+                <Pressable
+                  style={styles.modalConfirm}
+                  onPress={() => { setCustomStage(null); onScheduleConfirm(customDraftRef.current); }}
+                >
+                  <Text style={styles.modalConfirmText}>
+                    {t('email_composer.schedule_send', 'Schedule send')}
+                  </Text>
+                </Pressable>
+              </View>
+            </Pressable>
+          </Pressable>
+        </Modal>
+      )}
+
+      {customStage !== null && Platform.OS !== 'ios' && (
+        <DateTimePicker
+          value={customDraftRef.current}
+          mode={customStage === 'time' ? 'time' : 'date'}
+          display="default"
+          minimumDate={customStage === 'date' ? new Date() : undefined}
+          onChange={onCustomPickerChange}
+        />
+      )}
     </SafeAreaView>
   );
 }
@@ -1302,5 +1512,34 @@ function makeStyles(c: ThemePalette) {
     backgroundColor: c.primary,
   },
   modalConfirmText: { ...typography.bodyMedium, color: c.primaryForeground },
+  scheduleCard: {
+    width: '100%',
+    maxWidth: 420,
+    backgroundColor: c.background,
+    borderRadius: radius.md,
+    borderWidth: 1,
+    borderColor: c.border,
+    padding: spacing.lg,
+    gap: spacing.xs,
+  },
+  scheduleWarning: {
+    ...typography.caption,
+    color: c.error,
+    marginBottom: spacing.xs,
+  },
+  scheduleRow: {
+    flexDirection: 'row',
+    alignItems: 'center',
+    gap: spacing.sm,
+    paddingVertical: spacing.sm + 2,
+    minHeight: 44,
+  },
+  scheduleRowLabel: { ...typography.body, color: c.text, flex: 1 },
+  scheduleRowTime: { ...typography.caption, color: c.textMuted },
+  scheduleCancel: {
+    alignItems: 'center',
+    paddingVertical: spacing.sm,
+    marginTop: spacing.xs,
+  },
   });
 }