fix(mobile): dismiss to Agents list after remote session exit

apps/mobile/src/components/agents/exit-remote-session-with-feedback.test.ts

@@ -18,7 +18,7 @@ function createHarness() {
   const onAccepted = vi.fn(() => {
     order.push('accepted');
   });
-  const router = { replace: vi.fn(() => order.push('replace')) };
+  const router = { dismissTo: vi.fn(() => order.push('dismiss')) };
   const lock = createLock();
   return { order, onAccepted, router, lock };
 }
@@ -28,7 +28,7 @@ describe('exitRemoteSessionWithFeedback — happy path', () => {
     vi.clearAllMocks();
   });
 
-  it('shows "Session exited", calls onAccepted, and replaces with the sessions route', async () => {
+  it('shows "Session exited", calls onAccepted, and dismisses to the sessions route', async () => {
     const { order, onAccepted, router, lock } = createHarness();
     const exit = vi.fn(async () => {
       order.push('exit');
@@ -41,9 +41,9 @@ describe('exitRemoteSessionWithFeedback — happy path', () => {
     expect(toast.success).toHaveBeenCalledWith('Session exited');
     expect(toast.error).not.toHaveBeenCalled();
     expect(onAccepted).toHaveBeenCalledTimes(1);
-    expect(router.replace).toHaveBeenCalledTimes(1);
-    expect(router.replace).toHaveBeenCalledWith(SESSIONS_ROUTE);
-    expect(order).toEqual(['exit', 'accepted', 'replace']);
+    expect(router.dismissTo).toHaveBeenCalledTimes(1);
+    expect(router.dismissTo).toHaveBeenCalledWith(SESSIONS_ROUTE);
+    expect(order).toEqual(['exit', 'accepted', 'dismiss']);
     expect(lock.current).toBe(false);
   });
 });
@@ -71,7 +71,7 @@ describe('exitRemoteSessionWithFeedback — retryable error', () => {
     });
     expect(toast.success).not.toHaveBeenCalled();
     expect(onAccepted).not.toHaveBeenCalled();
-    expect(router.replace).not.toHaveBeenCalled();
+    expect(router.dismissTo).not.toHaveBeenCalled();
     expect(lock.current).toBe(false);
   });
 
@@ -97,7 +97,7 @@ describe('exitRemoteSessionWithFeedback — retryable error', () => {
     });
     expect(lock.current).toBe(false);
     expect(onAccepted).not.toHaveBeenCalled();
-    expect(router.replace).not.toHaveBeenCalled();
+    expect(router.dismissTo).not.toHaveBeenCalled();
   });
 
   it('does not start a second exit mutation while a retry is pending', async () => {
@@ -137,7 +137,7 @@ describe('exitRemoteSessionWithFeedback — retryable error', () => {
     expect(lock.current).toBe(true);
     expect(exit).toHaveBeenCalledTimes(2);
     expect(onAccepted).not.toHaveBeenCalled();
-    expect(router.replace).not.toHaveBeenCalled();
+    expect(router.dismissTo).not.toHaveBeenCalled();
 
     exitPromiseRef.resolve?.();
     await vi.waitFor(() => {
@@ -197,7 +197,7 @@ describe('exitRemoteSessionWithFeedback — non-retryable error', () => {
     expect(options?.action).toBeUndefined();
     expect(toast.success).not.toHaveBeenCalled();
     expect(onAccepted).not.toHaveBeenCalled();
-    expect(router.replace).not.toHaveBeenCalled();
+    expect(router.dismissTo).not.toHaveBeenCalled();
     expect(lock.current).toBe(false);
   });
 });

apps/mobile/src/components/agents/exit-remote-session-with-feedback.ts

@@ -1,12 +1,17 @@
 import { toast } from 'sonner-native';
 
-import { type AgentSessionRouterLike } from '@/components/agents/session-router-like';
+import { type Href } from 'expo-router';
 import { settleVoiceInputBeforeSubmit } from '@/lib/voice-input/voice-input-submit';
 
+/** Structural subset of Expo Router's router used for post-exit navigation. */
+type ExitRemoteSessionRouter = {
+  dismissTo: (href: Href) => void;
+};
+
 type ExitRemoteSessionWithFeedbackInput = {
   exit: () => Promise<void>;
   onAccepted: () => void;
-  router: AgentSessionRouterLike;
+  router: ExitRemoteSessionRouter;
   /**
    * The composer SubmitLock, exposed as a `{ current: boolean }` ref so the
    * retry action can re-acquire the same admission gate the initial send
@@ -107,7 +112,10 @@ export async function exitRemoteSessionWithFeedback({
 
     toast.success(SESSION_EXITED_MESSAGE);
     onAccepted();
-    router.replace(SESSIONS_ROUTE);
+    // POP_TO pops the exited `agent-chat` route off the `(app)` stack and
+    // focuses the existing `(tabs)` entry, so back cannot return to the
+    // exited session.
+    router.dismissTo(SESSIONS_ROUTE);
   };
 
   await runExit();