修复窗口标题栏测试隔离

每个窗口测试结束后清理 DOM 挂载

apps/ai-game-creator-shell/tests/WindowChrome.test.tsx

@@ -1,8 +1,8 @@
 // @vitest-environment jsdom
 
-import { fireEvent, render, screen } from '@testing-library/react';
+import { cleanup, fireEvent, render, screen } from '@testing-library/react';
 import userEvent from '@testing-library/user-event';
-import { beforeEach, describe, expect, it, vi } from 'vitest';
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
 
 import { APP_NAME } from '../src/app/appMetadata';
 import type { GameCreatorDirectActiveTurn } from '../src/app/types';
@@ -50,6 +50,8 @@ function ActiveRunsSetter({
 }
 
 describe('WindowChrome', () => {
+  afterEach(cleanup);
+
   beforeEach(() => {
     nativeWindow.minimize.mockReset();
     nativeWindow.toggleMaximize.mockReset();