feat(cli): warn users that rewind is disabled in IDE mode (#4122)

packages/cli/src/ui/AppContainer.test.tsx

@@ -3077,6 +3077,85 @@ describe('AppContainer State Management', () => {
       expect(trigger.activeCount()).toBe(0);
     });
   });
+
+  describe('IDE mode rewind guard', () => {
+    it('shows info message instead of opening rewind selector when IDE mode is enabled', () => {
+      const mockAddItem = vi.fn();
+      mockedUseHistory.mockReturnValue({
+        history: [{ id: 1, type: 'user', text: 'hello' }],
+        addItem: mockAddItem,
+        updateItem: vi.fn(),
+        clearItems: vi.fn(),
+        loadHistory: vi.fn(),
+        truncateToItem: vi.fn(),
+      });
+      mockedUseGeminiStream.mockReturnValue({
+        streamingState: 'idle',
+        submitQuery: vi.fn(),
+        initError: null,
+        pendingHistoryItems: [],
+        thought: null,
+        cancelOngoingRequest: vi.fn(),
+        retryLastPrompt: vi.fn(),
+      });
+      vi.spyOn(mockConfig, 'getIdeMode').mockReturnValue(true);
+
+      render(
+        <AppContainer
+          config={mockConfig}
+          settings={mockSettings}
+          version="1.0.0"
+          initializationResult={mockInitResult}
+        />,
+      );
+
+      capturedUIActions.openRewindSelector();
+
+      expect(mockAddItem).toHaveBeenCalledWith(
+        expect.objectContaining({
+          type: 'info',
+          text: expect.stringMatching(/rewind.*disabled.*IDE/i),
+        }),
+        expect.any(Number),
+      );
+      expect(capturedUIState.isRewindSelectorOpen).toBeFalsy();
+    });
+
+    it('opens rewind selector normally when IDE mode is disabled', () => {
+      const mockAddItemDisabled = vi.fn();
+      mockedUseHistory.mockReturnValue({
+        history: [{ id: 1, type: 'user', text: 'hello' }],
+        addItem: mockAddItemDisabled,
+        updateItem: vi.fn(),
+        clearItems: vi.fn(),
+        loadHistory: vi.fn(),
+        truncateToItem: vi.fn(),
+      });
+      mockedUseGeminiStream.mockReturnValue({
+        streamingState: 'idle',
+        submitQuery: vi.fn(),
+        initError: null,
+        pendingHistoryItems: [],
+        thought: null,
+        cancelOngoingRequest: vi.fn(),
+        retryLastPrompt: vi.fn(),
+      });
+      vi.spyOn(mockConfig, 'getIdeMode').mockReturnValue(false);
+
+      render(
+        <AppContainer
+          config={mockConfig}
+          settings={mockSettings}
+          version="1.0.0"
+          initializationResult={mockInitResult}
+        />,
+      );
+
+      capturedUIActions.openRewindSelector();
+
+      expect(mockAddItemDisabled).not.toHaveBeenCalled();
+    });
+  });
 });
 
 describe('dedupeNewestFirst', () => {

packages/cli/src/ui/AppContainer.tsx

@@ -2160,14 +2160,25 @@ export const AppContainer = (props: AppContainerProps) => {
   }, []);
 
   // --- Rewind selector callbacks ---
+  // IDE guard here is NOT redundant with the keyboard handler guard (line ~2375):
+  // /rewind calls openRewindSelector directly, bypassing the keyboard handler.
   const openRewindSelector = useCallback(() => {
     if (streamingState !== StreamingState.Idle) return;
-    if (config.getIdeMode()) return;
     if (dialogsVisibleRef.current) return;
+    if (config.getIdeMode()) {
+      historyManager.addItem(
+        {
+          type: 'info',
+          text: 'Rewind is disabled in IDE mode.',
+        },
+        Date.now(),
+      );
+      return;
+    }
     const hasUserTurns = historyManager.history.some((h) => h.type === 'user');
     if (!hasUserTurns) return;
     setIsRewindSelectorOpen(true);
-  }, [streamingState, config, historyManager.history]);
+  }, [streamingState, config, historyManager]);
   openRewindSelectorRef.current = openRewindSelector;
 
   const closeRewindSelector = useCallback(() => {
@@ -2559,7 +2570,8 @@ export const AppContainer = (props: AppContainerProps) => {
         // Input is empty and idle — double-ESC opens rewind selector
         if (
           streamingState === StreamingState.Idle &&
-          !dialogsVisibleRef.current
+          !dialogsVisibleRef.current &&
+          !config.getIdeMode()
         ) {
           if (escapeTimerRef.current) {
             clearTimeout(escapeTimerRef.current);