fix(mobile): preserve hosted resume and reconnect

mobile/app/h/[hostId]/session/[worktreeId].tsx

@@ -316,6 +316,9 @@ type SessionScreenProps = {
   sessionChatPendingDeliveryOperations?: HostSessionChatPendingDeliveryOperations
   connectionState?: ConnectionState
   nativeHostBinding?: boolean
+  reconnect?: () => Promise<void>
+  reconnectAttempts?: number
+  lastConnectedAt?: number | null
 }
 
 export { SessionScreen as default }
@@ -334,7 +337,10 @@ export function SessionScreen({
   sessionChatDraftOperations: sessionChatDraftOperationsProp,
   sessionChatPendingDeliveryOperations: sessionChatPendingDeliveryOperationsProp,
   connectionState: connectionStateProp,
-  nativeHostBinding = true
+  nativeHostBinding = true,
+  reconnect: reconnectProp,
+  reconnectAttempts: reconnectAttemptsProp,
+  lastConnectedAt: lastConnectedAtProp
 }: SessionScreenProps = {}) {
   const {
     hostId,
@@ -441,8 +447,10 @@ export function SessionScreen({
     },
     [sessionDeviceOperations]
   )
-  const reconnectAttempts = useReconnectAttempt(hostId)
-  const lastConnectedAt = useLastConnectedAt(hostId)
+  const nativeReconnectAttempts = useReconnectAttempt(hostId)
+  const nativeLastConnectedAt = useLastConnectedAt(hostId)
+  const reconnectAttempts = reconnectAttemptsProp ?? nativeReconnectAttempts
+  const lastConnectedAt = lastConnectedAtProp ?? nativeLastConnectedAt
   const relayRecovery = useRelayRecoveryStatus(hostId)
   const forceReconnectHost = useForceReconnect()
   const { name: worktreeName, resolution: worktreeResolution } = useLiveWorktreeName({
@@ -3973,7 +3981,7 @@ export function SessionScreen({
                 disabled={!showConnectionRetry}
                 onPress={() => {
                   if (hostId) {
-                    void forceReconnectHost(hostId)
+                    void (reconnectProp ? reconnectProp() : forceReconnectHost(hostId))
                   }
                 }}
                 accessibilityRole={showConnectionRetry ? 'button' : undefined}

mobile/host-web-app/h/[hostId]/session/[worktreeId].tsx

@@ -101,6 +101,13 @@ export default function HostMobileWebSessionRoute() {
       sessionChatPendingDeliveryOperations={sessionChatPendingDeliveryOperations}
       connectionState={connectionState}
       nativeHostBinding={false}
+      reconnect={() =>
+        shell.client
+          ? shell.client.navigationReconnect().then(() => undefined)
+          : Promise.reject(new Error('Native shell channel unavailable'))
+      }
+      reconnectAttempts={shell.reconnectAttempts}
+      lastConnectedAt={shell.lastConnectedAt}
     />
   )
 }

mobile/host-web-app/index.tsx

@@ -1,4 +1,4 @@
-import { useEffect, useMemo } from 'react'
+import { useMemo } from 'react'
 import { usePathname, useRouter } from 'expo-router'
 import { HostScreen } from '../app/h/[hostId]/index'
 import { HostProtocolGatesProvider } from '../src/components/host-protocol-gates-context'
@@ -16,11 +16,6 @@ export default function HostMobileWebRoute() {
   const shell = useMobileWebNativeShell()
   const router = useRouter()
   const pathname = usePathname()
-  useEffect(() => {
-    if (shell.context) {
-      shell.rememberRoute({ kind: 'workspaceList' })
-    }
-  }, [shell.context, shell.rememberRoute])
   const workspaceOperations = useMemo(
     () => (shell.client ? webHostWorkspaceOperations(shell.client) : undefined),
     [shell.client]

mobile/src/session/mobile-web-session-screen-binding-source.test.ts

@@ -40,6 +40,9 @@ describe('mobile web session screen binding', () => {
     expect(hostedSessionRoute).toContain(
       'sessionNativeChatOperations={sessionNativeChatOperations}'
     )
+    expect(hostedSessionRoute).toContain('reconnect={() =>')
+    expect(hostedSessionRoute).toContain('reconnectAttempts={shell.reconnectAttempts}')
+    expect(hostedSessionRoute).toContain('lastConnectedAt={shell.lastConnectedAt}')
     expect(hostedSessionRoute).toContain('<SessionScreen')
     expect(nativeSessionRoute).toContain('export function SessionScreen(')
     expect(nativeSessionRoute).not.toContain('Clipboard.setStringAsync')

mobile/src/worktree/mobile-web-host-screen-binding-source.test.ts

@@ -43,6 +43,7 @@ describe('mobile web host screen bindings', () => {
     expect(hostedRouteSource).toContain('nativeHostBinding={false}')
     expect(hostedRouteSource).toContain('useWebHostStatusGates({')
     expect(hostedRouteSource).toContain('value={hostStatusGates}')
+    expect(hostedRouteSource).not.toContain("rememberRoute({ kind: 'workspaceList' })")
     expect(hostedRouteSource).not.toContain('hostCapabilities: []')
     expect(hostedRouteSource).not.toContain('floatingWorkspaceEnabled: false')
     expect(hostedRouteSource).not.toContain('hostDisplayName=')