refactor(StorageCleaner): 规范化页面组件目录结构

- 将子组件移至 components/ 子目录（OptionItem、AutoRefreshToggle、CleaningResult、StorageCleanerConfirm、StorageOptionsGrid、ErrorDisplay）
- 创建 __tests__/ 目录结构
- 更新所有相关导入路径

Co-authored-by: Cursor <cursoragent@cursor.com>

src/pages/StorageCleaner/__tests__/index.test.tsx

@@ -0,0 +1,31 @@
+import { render, screen } from '@testing-library/react';
+import { describe, it, expect, vi } from 'vitest';
+import Index from '../index';
+
+// Mock the chrome APIs
+vi.mock('@/utils/chromeStorage', () => ({
+  storageUtil: {
+    get: vi.fn().mockResolvedValue(null),
+    set: vi.fn().mockResolvedValue(undefined),
+  },
+}));
+
+vi.mock('@/utils/storageCleaner', () => ({
+  getCurrentTab: vi.fn().mockResolvedValue({ id: 1, url: 'https://example.com' }),
+  isRestrictedUrl: vi.fn().mockReturnValue(false),
+  getCookieSize: vi.fn().mockResolvedValue(0),
+  getLocalStorageSize: vi.fn().mockResolvedValue(0),
+  getSessionStorageSize: vi.fn().mockResolvedValue(0),
+  getOriginStorageEstimate: vi.fn().mockResolvedValue(0),
+  getCacheStorageSize: vi.fn().mockResolvedValue(0),
+  getServiceWorkerCount: vi.fn().mockResolvedValue(0),
+  clearStorage: vi.fn().mockResolvedValue({ overallSuccess: true }),
+  formatCleaningResult: vi.fn().mockReturnValue('Cleaned successfully'),
+}));
+
+describe('StorageCleaner 页面', () => {
+  it('应该渲染初始化加载状态', () => {
+    render(<Index />);
+    expect(screen.getByText(/initializing/i)).toBeInTheDocument();
+  });
+});