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/main/ipc-handlers.ts

@@ -3,7 +3,7 @@ import { readFileContent, saveFileContent, buildDirTree } from './file-system'
 import { FileWatcher, SidebarWatcher } from './file-watcher'
 import { IPC_CHANNELS } from '../shared/ipc-channels'
 import { stat } from 'fs/promises'
-import { join, basename, resolve, normalize, isAbsolute } from 'path'
+import { basename, normalize, isAbsolute } from 'path'
 
 // 安全校验：拒绝路径遍历攻击
 function validatePath(filePath: string): boolean {