refactor(cli): unify Escape key handling in AppContainer

Consolidate Escape key behavior to improve UX and prevent conflicts:

- Move Escape handling from useGeminiStream to AppContainer
- Input with content: double-press to clear, then single-press to cancel
- Empty input: single-press immediately cancels ongoing request
- Preserve embeddedShellFocused check to allow shell's own escape handling
- Update tests to use cancelOngoingRequest directly instead of simulating keypress

Fixes inconsistent escape behavior between input clearing and request cancellation.

Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>

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

@@ -63,7 +63,6 @@ import {
 import { promises as fs } from 'node:fs';
 import path from 'node:path';
 import { useSessionStats } from '../contexts/SessionContext.js';
-import { useKeypress } from './useKeypress.js';
 import type { LoadedSettings } from '../../config/settings.js';
 
 const debugLogger = createDebugLogger('GEMINI_STREAM');
@@ -115,7 +114,6 @@ export const useGeminiStream = (
     persistSessionModel?: string;
     showGuidance?: boolean;
   }>,
-  isShellFocused?: boolean,
 ) => {
   const [initError, setInitError] = useState<string | null>(null);
   const abortControllerRef = useRef<AbortController | null>(null);
@@ -309,15 +307,6 @@ export const useGeminiStream = (
     getPromptCount,
   ]);
 
-  useKeypress(
-    (key) => {
-      if (key.name === 'escape' && !isShellFocused) {
-        cancelOngoingRequest();
-      }
-    },
-    { isActive: streamingState === StreamingState.Responding },
-  );
-
   const prepareQueryForGemini = useCallback(
     async (
       query: PartListUnion,