v0.2.0: 全面代码质量优化

- ESLint flat config + Prettier + EditorConfig
- Markdown处理器LRU缓存
- Zustand选择器优化减少重渲染
- CodeMirror Compartment主题热切换
- Preview防抖(150ms) + IndexedDB去抖(500ms)
- 组件拆分: App.tsx 310→104行, Sidebar.tsx 244→90行
- 统一错误处理 errorHandler.ts
- ConfirmDialog替代原生confirm
- LoadingSpinner加载状态
- Toast多条堆叠+类型区分
- 可访问性增强(ARIA属性、键盘导航)
- Vitest测试框架(78个测试用例)
- Git hooks(husky + lint-staged)
- 项目文档(README.md, CONTRIBUTING.md)

src/preload/preload.d.ts

@@ -0,0 +1,60 @@
+/**
+ * DX-02: Preload 类型安全声明
+ * 为 window.electronAPI 提供完整的 TypeScript 类型定义，
+ * 确保渲染进程访问 API 时有完整的类型提示和编译时检查。
+ */
+
+import type {
+  OpenFileResponse,
+  ReadFileResult,
+  SaveFilePayload,
+  SaveAsPayload,
+  SaveFileResult,
+  ReloadFileResult,
+  FileStatsResult,
+  ReadDirTreeResult,
+} from '../shared/types'
+
+interface ElectronAPI {
+  // File operations
+  openFile: () => Promise<OpenFileResponse>
+  readFile: (filePath: string) => Promise<ReadFileResult>
+  saveFile: (data: SaveFilePayload) => Promise<SaveFileResult>
+  saveFileAs: (data: SaveAsPayload) => Promise<SaveFileResult>
+  getCurrentPath: () => Promise<string | null>
+  getFileStats: (filePath: string) => Promise<FileStatsResult>
+  reloadFile: () => Promise<ReloadFileResult>
+
+  // Tab management
+  tabSwitched: (filePath: string | null) => Promise<void>
+
+  // Window control
+  forceClose: () => Promise<void>
+  cancelClose: () => Promise<void>
+
+  // Shell
+  openExternal: (url: string) => void
+
+  // File Tree (Sidebar)
+  readDirTree: (dirPath: string) => Promise<ReadDirTreeResult>
+  openFolderDialog: () => Promise<{ canceled: boolean; filePaths: string[] }>
+  watchDir: (dirPath: string) => Promise<void>
+  unwatchDir: () => Promise<void>
+
+  // Events from main process — 返回取消订阅函数
+  onFileOpenInTab: (callback: (data: { filePath: string; content: string }) => void) => () => void
+  onMenuSave: (callback: () => void) => () => void
+  onMenuSaveAs: (callback: () => void) => () => void
+  onViewModeChange: (callback: (mode: string) => void) => () => void
+  onExternalModification: (callback: (filePath: string) => void) => () => void
+  onDirChanged: (callback: () => void) => () => void
+  onConfirmClose: (callback: () => void) => () => void
+}
+
+declare global {
+  interface Window {
+    electronAPI: ElectronAPI
+  }
+}
+
+export {}