fix(cli): improve focus navigation for interactive and background shells (#18343)

packages/cli/src/ui/hooks/shellReducer.ts

@@ -104,10 +104,15 @@ export function shellReducer(
       }
       shell.output = newOutput;
 
+      const nextState = { ...state, lastShellOutputTime: Date.now() };
+
       if (state.isBackgroundShellVisible) {
-        return { ...state, backgroundShells: new Map(state.backgroundShells) };
+        return {
+          ...nextState,
+          backgroundShells: new Map(state.backgroundShells),
+        };
       }
-      return state;
+      return nextState;
     }
     case 'SYNC_BACKGROUND_SHELLS': {
       return { ...state, backgroundShells: new Map(state.backgroundShells) };

packages/cli/src/ui/hooks/useGeminiStream.ts

@@ -474,12 +474,6 @@ export const useGeminiStream = (
 
   const activePtyId = activeShellPtyId || activeToolPtyId;
 
-  useEffect(() => {
-    if (!activePtyId) {
-      setShellInputFocused(false);
-    }
-  }, [activePtyId, setShellInputFocused]);
-
   const prevActiveShellPtyIdRef = useRef<number | null>(null);
   useEffect(() => {
     if (