v0.3.10: 全面优化增强 — 17项Bug修复/稳定性/功能改进

P0 致命Bug修复:
- A1: openFolderDialog 类型/运行时崩溃(文件夹打开功能完全失效)
- A2: SourceEditor 受控textarea手动改DOM反模式
- A3: tabStore.updateTabContent 内容相同时误标isModified

死代码清理:
- B1: 删除menu:*/save/as/viewMode 三个永不触发的IPC通道

健壮性修复:
- E1: rehypeFixImages 路径规范化+防越界加固
- E2: getFileName 尾斜杠返回正确文件名
- E3: EditorToolbar 行内代码按钮改用toggleInlineCodeCommand
- E4: ErrorBoundary 内联样式抽为CSS类

功能增强:
- D1: 标签页拖拽排序(tabStore.moveTab + TabBar DnD + CSS)
- D2: Milkdown自动配对括号/引号(ProseMirror插件)
- D3: 状态栏自动保存开关可点击
- D4: 文档大纲活跃标题高亮(useActiveHeading hook)
- D5: 关闭窗口前flush防抖数据(flushSaveToDB)
- D6: 搜索替换支持正则表达式

类型/架构:
- C2: preload类型集中定义(ElectronAPI契约)
- __pycache__ typo修复

文档/版本:
- README/DESIGN同步为Milkdown + v0.3.10
- 项目结构树/技术栈/快捷键表更新

验证: typecheck(仅7预存), lint✅, test 96/96, vite build✅

src/preload/preload.d.ts

@@ -1,55 +1,11 @@
 /**
  * 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。
+ * ElectronAPI 类型现在由 ../renderer/types/ipc.ts 集中定义，
+ * preload/index.ts 引入该类型做编译期契约检查。
+ * 本文件仅保留全局 Window 增强声明。
  */
 
-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
-}
+import type { ElectronAPI } from '../renderer/types/ipc'
 
 declare global {
   interface Window {