fix: translate the file sharing roles and label the files toolbar

The share sheet asked for files.share_role_* keys that no catalog has,
so Viewer, Editor and Manager stayed English everywhere; it now uses
the webmail's sharing.preset names and its "Share \"{name}\"" title.
The per-file menu, back and clear-selection buttons get screen reader
labels, and the "sharing is not available" error is translated.

locales/rn/en.json

@@ -375,6 +375,7 @@
     "share_remove": "Remove access",
     "share_role_custom": "Custom",
     "share_search_placeholder": "Search by name or email",
+    "share_unavailable": "Sharing is not available on this device",
     "shared_with": "Shared with",
     "sharing_access": "Sharing & access",
     "upload_unavailable": "The file picker is not installed in this build. Rebuild the app to enable uploads."

src/components/__tests__/screens-i18n.test.ts

@@ -0,0 +1,23 @@
+// Screens and sheets outside Settings and Contacts whose every user-visible
+// string goes through t(). A literal English label, alert or JSX text
+// sneaking back in stays English in every locale, so this scans the source.
+import { describe, it, expect } from 'vitest';
+import { join } from 'node:path';
+import { findUntranslatedLiterals } from './untranslated-literals';
+
+const SRC = join(__dirname, '..', '..');
+
+// File (relative to src/) → texts that stay as they are on purpose.
+const TRANSLATED_FILES: Record<string, string[]> = {
+  'screens/FilesScreen.tsx': [],
+  'components/files/ShareSheet.tsx': [],
+  'components/files/FilePreviewModal.tsx': [],
+};
+
+describe('translated screens', () => {
+  for (const [file, allow] of Object.entries(TRANSLATED_FILES)) {
+    it(`${file} has no hard-coded English text`, () => {
+      expect(findUntranslatedLiterals(join(SRC, file), allow)).toEqual([]);
+    });
+  }
+});

src/components/files/ShareSheet.tsx

@@ -39,10 +39,11 @@ const FILE_PRESETS: Record<RolePreset, FileNodeRights> = {
   },
 };
 
+// The webmail's sharing presets (same rights, same names).
 const PRESET_LABEL_KEYS: Record<RolePreset, [string, string]> = {
-  read: ['files.share_role_viewer', 'Viewer'],
-  readWrite: ['files.share_role_editor', 'Editor'],
-  manager: ['files.share_role_manager', 'Manager'],
+  read: ['sharing.preset.read', 'Read only'],
+  readWrite: ['sharing.preset.readWrite', 'Read & write'],
+  manager: ['sharing.preset.manager', 'Manager'],
 };
 
 const PRESET_ORDER: RolePreset[] = ['read', 'readWrite', 'manager'];
@@ -159,7 +160,7 @@ export default function ShareSheet({ node, onClose, onChanged }: ShareSheetProps
               <View style={styles.titleRow}>
                 <Icon size={18} color={c.textMuted} />
                 <Text style={styles.title} numberOfLines={1}>
-                  {t('files.share', 'Share')} “{node.name}”
+                  {t('sharing.title', 'Share "{name}"', { name: node.name })}
                 </Text>
               </View>
               {isFolder(node) ? (
@@ -188,6 +189,8 @@ export default function ShareSheet({ node, onClose, onChanged }: ShareSheetProps
                                 onPress={() => void applyShare(principalId, FILE_PRESETS[p])}
                                 disabled={busy}
                                 style={[styles.chip, preset === p && styles.chipActive]}
+                                accessibilityRole="button"
+                                accessibilityState={{ selected: preset === p, disabled: busy }}
                               >
                                 <Text
                                   style={[styles.chipText, preset === p && styles.chipTextActive]}

src/screens/FilesScreen.tsx

@@ -420,7 +420,7 @@ export default function FilesScreen() {
       dest.create();
       dest.write(bytes);
       if (!(await Sharing.isAvailableAsync())) {
-        throw new Error('Sharing is not available on this device');
+        throw new Error(t('files.share_unavailable', 'Sharing is not available on this device'));
       }
       await Sharing.shareAsync(dest.uri, { mimeType: 'application/zip', dialogTitle: dest.name });
     } catch (e) {
@@ -673,7 +673,13 @@ export default function FilesScreen() {
       return (
         <View style={styles.header}>
           <View style={styles.headerRow}>
-            <Pressable onPress={clearSelection} hitSlop={8} style={styles.headerBtn}>
+            <Pressable
+              onPress={clearSelection}
+              hitSlop={8}
+              style={styles.headerBtn}
+              accessibilityRole="button"
+              accessibilityLabel={t('email_list.batch_actions.clear_selection', 'Clear selection')}
+            >
               <X size={22} color={c.text} />
             </Pressable>
             <Text style={styles.title}>
@@ -711,7 +717,13 @@ export default function FilesScreen() {
         <View style={styles.headerRow}>
           <View style={styles.headerLeft}>
             {canBack ? (
-              <Pressable onPress={goBack} hitSlop={8} style={styles.headerBtn}>
+              <Pressable
+                onPress={goBack}
+                hitSlop={8}
+                style={styles.headerBtn}
+                accessibilityRole="button"
+                accessibilityLabel={t('common.back', 'Back')}
+              >
                 <ChevronLeft size={22} color={c.text} />
               </Pressable>
             ) : null}
@@ -890,6 +902,8 @@ export default function FilesScreen() {
             }}
             hitSlop={8}
             style={styles.rowMore}
+            accessibilityRole="button"
+            accessibilityLabel={t('files.context_menu', 'Actions')}
           >
             <MoreVertical size={18} color={c.textMuted} />
           </Pressable>