fix(mobile): scope the ask dismissal to the provider session, not the tab

A restart, /clear, or resume swaps the provider session inside one tab. The
next session's first question is often byte-identical, so a tab-keyed dismissal
hid the live card and left the turn blocked with nothing to act on.

mobile/src/session/use-mobile-native-chat-ask-dismiss.ts

@@ -14,8 +14,9 @@ export function useMobileNativeChatAskDismiss(args: {
    *  `ask`: reading the gated prompt as the detected one is the resurfacing bug
    *  this hook exists to close. */
   detectedAsk: AskPrompt | null
-  /** Dismissals are scoped to the tab that showed the card, so one tab's
-   *  dismissal can't hide an identical question on another tab. */
+  /** Dismissals are scoped to the tab *and* provider session that showed the
+   *  card, so neither another tab nor a restarted session in the same tab can
+   *  have an identical question hidden by an answer that was never about it. */
   scopeKey: string | null
   /** True while the chat surface can actually observe the prompt. A null ask it
    *  cannot see — off-chat, or before a re-subscribed transcript lands — proves

mobile/src/session/use-mobile-native-chat-controller.test.ts

@@ -436,8 +436,9 @@ describe('useMobileNativeChatController ask dismissal across a transcript reload
   const PROMPT = { questions: [{ question: 'Which path?', multiSelect: false, options: [] }] }
 
   const chatTab = { type: 'terminal', id: 'tab-1', launchAgent: 'claude' }
-  /** Mutable so a test can move the user to another tab mid-render. */
-  const activeTab = { id: 'tab-1' }
+  /** Mutable so a test can move the user to another tab — or restart the agent
+   *  into a new provider session on the same tab — mid-render. */
+  const activeTab = { id: 'tab-1', sessionId: 'session-1' }
 
   function Harness(): null {
     controller = useMobileNativeChatController({
@@ -445,7 +446,11 @@ describe('useMobileNativeChatController ask dismissal across a transcript reload
       connState: 'connected',
       hostId: 'h',
       worktreeId: 'w',
-      activeSessionTab: { ...chatTab, id: activeTab.id } as never,
+      activeSessionTab: {
+        ...chatTab,
+        id: activeTab.id,
+        agentStatus: { agentType: 'claude', providerSession: { id: activeTab.sessionId } }
+      } as never,
       activeSessionTabId: activeTab.id,
       activeHandleRef: { current: 'term-1' },
       deviceTokenRef: { current: null },
@@ -507,6 +512,7 @@ describe('useMobileNativeChatController ask dismissal across a transcript reload
     setTranscript('ready', 0)
     viewMode.isTabChatView = () => true
     activeTab.id = 'tab-1'
+    activeTab.sessionId = 'session-1'
   })
 
   it('scopes the dismissal to the tab it was taken on', () => {
@@ -521,6 +527,29 @@ describe('useMobileNativeChatController ask dismissal across a transcript reload
     expect(controller?.nativeChatAsk).not.toBeNull()
   })
 
+  it('shows a restarted session’s identical first question on the same tab', () => {
+    // A restart, `/clear`, or resume swaps the provider session inside one tab,
+    // and the next session's first question is often byte-identical — same repo,
+    // same prompt, same template. Keyed by tab alone the old answer hides it, so
+    // the live card never renders and the turn sits blocked with nothing to act on.
+    act(() => controller?.dismissNativeChatAsk())
+    expect(controller?.nativeChatAsk).toBeNull()
+
+    // The restart re-subscribes the transcript, so the read is in flight for a beat.
+    activeTab.sessionId = 'session-2'
+    setTranscript('loading')
+    promptsState.ask = null
+    promptsState.detectedAsk = null
+    step()
+
+    setTranscript('ready')
+    promptsState.ask = PROMPT
+    promptsState.detectedAsk = PROMPT
+    step()
+
+    expect(controller?.nativeChatAsk).not.toBeNull()
+  })
+
   it('retires the dismissal only on the ungated prompt, not the gated one', () => {
     // The paused gate hides the card whenever the agent is not waiting, but a
     // hidden card is no evidence the sticky status prompt cleared. Feeding the

mobile/src/session/use-mobile-native-chat-controller.ts

@@ -206,6 +206,13 @@ export function useMobileNativeChatController(args: {
     (nativeChatSession.status === 'error' && nativeChatSession.messages.length > 0)
   const nativeChatAskObservable =
     showNativeChat && (nativeChatDetectedAsk != null || nativeChatTranscriptSettled)
+  // Scope the dismissal to the transcript the card was answered on, not the tab
+  // alone: a restart, `/clear`, or resume swaps the provider session inside one
+  // tab, and the new session's first question is often byte-identical (same repo,
+  // same prompt, same template). Keyed by tab, the old answer read as "already
+  // dismissed" and the live card never rendered. Same `\0` shape as
+  // `streamIdentity` above, which is the identity the transcript itself tracks.
+  const nativeChatAskScopeKey = `${activeSessionTabId ?? ''}\0${activeChatSessionId ?? ''}`
   const {
     askKey: nativeChatAskKey,
     showAsk: showNativeChatAsk,
@@ -213,7 +220,7 @@ export function useMobileNativeChatController(args: {
   } = useMobileNativeChatAskDismiss({
     ask: nativeChatAskPrompt,
     detectedAsk: nativeChatDetectedAsk,
-    scopeKey: activeSessionTabId,
+    scopeKey: nativeChatAskScopeKey,
     observing: nativeChatAskObservable
   })