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/index.ts

@@ -1,12 +1,14 @@
 import { contextBridge, ipcRenderer, shell } from 'electron'
 import { IPC_CHANNELS } from '../shared/ipc-channels'
+import type { ElectronAPI } from '../renderer/types/ipc'
 
-contextBridge.exposeInMainWorld('electronAPI', {
+// C-02: 运行时实现受 ElectronAPI 类型约束，编译期保证 preload 与渲染进程契约一致
+const api: ElectronAPI = {
   // File operations
   openFile: () => ipcRenderer.invoke(IPC_CHANNELS.DIALOG_OPEN_FILE),
   readFile: (filePath: string) => ipcRenderer.invoke(IPC_CHANNELS.FILE_READ, filePath),
-  saveFile: (data: { filePath: string | null; content: string }) => ipcRenderer.invoke(IPC_CHANNELS.FILE_SAVE, data),
-  saveFileAs: (data: { content: string }) => ipcRenderer.invoke(IPC_CHANNELS.FILE_SAVE_AS, data),
+  saveFile: (data) => ipcRenderer.invoke(IPC_CHANNELS.FILE_SAVE, data),
+  saveFileAs: (data) => ipcRenderer.invoke(IPC_CHANNELS.FILE_SAVE_AS, data),
   getCurrentPath: () => ipcRenderer.invoke(IPC_CHANNELS.FILE_GET_CURRENT_PATH),
   getFileStats: (filePath: string) => ipcRenderer.invoke(IPC_CHANNELS.FILE_STATS, filePath),
   reloadFile: () => ipcRenderer.invoke(IPC_CHANNELS.FILE_RELOAD),
@@ -37,39 +39,26 @@ contextBridge.exposeInMainWorld('electronAPI', {
   unwatchDir: () => ipcRenderer.invoke(IPC_CHANNELS.DIR_UNWATCH),
 
   // Events from main process — 返回取消订阅函数
-  onFileOpenInTab: (callback: (data: { filePath: string; content: string }) => void) => {
+  onFileOpenInTab: (callback) => {
     const handler = (_event: Electron.IpcRendererEvent, data: { filePath: string; content: string }) => callback(data)
     ipcRenderer.on(IPC_CHANNELS.FILE_OPEN_IN_TAB, handler)
     return () => { ipcRenderer.removeListener(IPC_CHANNELS.FILE_OPEN_IN_TAB, handler) }
   },
-  onMenuSave: (callback: () => void) => {
-    const handler = () => callback()
-    ipcRenderer.on(IPC_CHANNELS.MENU_SAVE, handler)
-    return () => { ipcRenderer.removeListener(IPC_CHANNELS.MENU_SAVE, handler) }
-  },
-  onMenuSaveAs: (callback: () => void) => {
-    const handler = () => callback()
-    ipcRenderer.on(IPC_CHANNELS.MENU_SAVE_AS, handler)
-    return () => { ipcRenderer.removeListener(IPC_CHANNELS.MENU_SAVE_AS, handler) }
-  },
-  onViewModeChange: (callback: (mode: string) => void) => {
-    const handler = (_event: Electron.IpcRendererEvent, mode: string) => callback(mode)
-    ipcRenderer.on(IPC_CHANNELS.MENU_VIEW_MODE, handler)
-    return () => { ipcRenderer.removeListener(IPC_CHANNELS.MENU_VIEW_MODE, handler) }
-  },
-  onExternalModification: (callback: (filePath: string) => void) => {
+  onExternalModification: (callback) => {
     const handler = (_event: Electron.IpcRendererEvent, filePath: string) => callback(filePath)
     ipcRenderer.on(IPC_CHANNELS.FILE_EXTERNALLY_MODIFIED, handler)
     return () => { ipcRenderer.removeListener(IPC_CHANNELS.FILE_EXTERNALLY_MODIFIED, handler) }
   },
-  onDirChanged: (callback: () => void) => {
+  onDirChanged: (callback) => {
     const handler = () => callback()
     ipcRenderer.on(IPC_CHANNELS.SIDEBAR_DIR_CHANGED, handler)
     return () => { ipcRenderer.removeListener(IPC_CHANNELS.SIDEBAR_DIR_CHANGED, handler) }
   },
-  onConfirmClose: (callback: () => void) => {
+  onConfirmClose: (callback) => {
     const handler = () => callback()
     ipcRenderer.on(IPC_CHANNELS.WINDOW_CONFIRM_CLOSE, handler)
     return () => { ipcRenderer.removeListener(IPC_CHANNELS.WINDOW_CONFIRM_CLOSE, handler) }
   }
-})
+}
+
+contextBridge.exposeInMainWorld('electronAPI', api)

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 {

src/renderer/App.tsx

@@ -1,5 +1,6 @@
 import React, { useState, useEffect, useCallback } from 'react'
 import { useTabStore } from './stores/tabStore'
+import { flushSaveToDB } from './stores/tabStore'
 import { useEditorStore } from './stores/editorStore'
 import { useTheme } from './hooks/useTheme'
 import { useSettings } from './hooks/useSettings'
@@ -51,7 +52,7 @@ export function App() {
   const { handleOpenFile, handleSave, handleSaveAs, handleOpenRecent } = useFileOperations(showToast)
   useDragDrop(showToast)
   useFileWatch()
-  const { isAutoSaving, autoSaveEnabled } = useAutoSave()
+  const { isAutoSaving, autoSaveEnabled, toggleAutoSave } = useAutoSave()
 
   // UX-01: 传入 confirm 函数替代原生 confirm()
   const handleConfirmClose = useCallback(async (message: string): Promise<boolean> => {
@@ -64,9 +65,9 @@ export function App() {
     })
   }, [confirm])
 
-  useUnsavedWarning(() => tabs.some(t => t.isModified), handleConfirmClose)
+  useUnsavedWarning(() => tabs.some(t => t.isModified), handleConfirmClose, flushSaveToDB)
   useKeyboard(handleOpenFile, handleSave, handleSaveAs)
-  useIpcListeners(handleSave, handleSaveAs)
+  useIpcListeners()
 
   useEffect(() => {
     if (!window.electronAPI) return
@@ -117,7 +118,7 @@ export function App() {
             )}
           </div>
         </div>
-        <StatusBar isAutoSaving={isAutoSaving} autoSaveEnabled={autoSaveEnabled} />
+        <StatusBar isAutoSaving={isAutoSaving} autoSaveEnabled={autoSaveEnabled} onToggleAutoSave={toggleAutoSave} />
         <ToastContainer toasts={toasts} onDismiss={dismissToast} />
         <DropOverlay />
         {showAbout && <AboutDialog onClose={handleCloseAbout} />}

src/renderer/components/Editor/EditorToolbar.tsx

@@ -10,6 +10,7 @@ import {
   wrapInBulletListCommand,
   wrapInOrderedListCommand,
   createCodeBlockCommand,
+  toggleInlineCodeCommand,
   insertImageCommand,
   toggleLinkCommand,
   insertHrCommand
@@ -63,7 +64,7 @@ export const EditorToolbar = React.memo(function EditorToolbar({ action }: Edito
       </button>
       <button
         className="toolbar-btn-sm"
-        onClick={() => exec(createCodeBlockCommand)}
+        onClick={() => exec(toggleInlineCodeCommand)}
         title="行内代码"
         aria-label="行内代码"
       >

src/renderer/components/Editor/useMilkdown.ts

@@ -18,6 +18,67 @@ import { Plugin, PluginKey } from '@milkdown/prose/state'
 import { Decoration, DecorationSet } from '@milkdown/prose/view'
 import type { EditorState } from '@milkdown/prose/state'
 
+// --- Auto-pair plugin (D2) ---
+
+const PAIRS: Record<string, string> = { '(': ')', '[': ']', '{': '}', '"': '"', "'": "'", '`': '`' }
+
+function createAutoPairPlugin(): Plugin {
+  return new Plugin({
+    props: {
+      handleTextInput(view, from, to, text) {
+        // 选中文本时用配对符号包裹
+        if (from !== to && PAIRS[text]) {
+          const close = PAIRS[text]
+          const { tr } = view.state
+          tr.insertText(text + view.state.doc.textBetween(from, to) + close, from, to)
+          view.dispatch(tr)
+          return true
+        }
+        return false
+      },
+      handleKeyDown(view, event) {
+        // 处理配对符号的自动闭合
+        const char = event.key
+        if (!PAIRS[char]) return false
+
+        const { state } = view
+        const { from, to } = state.selection
+
+        // Backspace: 删除配对符号（光标在两个配对符号中间时）
+        if (char === 'Backspace') {
+          if (from !== to || from < 2) return false
+          const before = state.doc.textBetween(from - 1, from)
+          const after = state.doc.textBetween(from, from + 1)
+          if (PAIRS[before] === after) {
+            const tr = state.tr.delete(from - 1, from + 1)
+            view.dispatch(tr)
+            return true
+          }
+          return false
+        }
+
+        if (from !== to) {
+          // 有选区时：包裹
+          const close = PAIRS[char]
+          const tr = state.tr.insertText(char + state.doc.textBetween(from, to) + close, from, to)
+          view.dispatch(tr)
+          return true
+        }
+
+        // 无选区：插入配对并光标置中
+        const close = PAIRS[char]
+        const tr = state.tr.insertText(char + close, from)
+        // 光标置于中间
+        tr.setSelection(
+          state.selection.constructor.create(tr.doc, from + 1)
+        )
+        view.dispatch(tr)
+        return true
+      }
+    }
+  })
+}
+
 // --- Search highlight plugin ---
 
 export interface SearchMatch {
@@ -105,8 +166,8 @@ export function useMilkdown({ content, onChange, darkMode }: UseMilkdownOptions)
         ctx.set(rootCtx, containerRef.current!)
         ctx.set(defaultValueCtx, initialContentRef.current)
 
-        // Inject search highlight plugin into ProseMirror plugin list
-        ctx.update(prosePluginsCtx, (plugins) => [...plugins, createSearchPlugin()])
+        // Inject search highlight plugin and auto-pair plugin into ProseMirror plugin list
+        ctx.update(prosePluginsCtx, (plugins) => [...plugins, createAutoPairPlugin(), createSearchPlugin()])
 
         // Configure listener for content changes
         const lm = ctx.get(listenerCtx)

src/renderer/components/ErrorBoundary/ErrorBoundary.tsx

@@ -35,52 +35,20 @@ export class ErrorBoundary extends Component<Props, State> {
         return this.props.fallback
       }
 
-      const isDev = (typeof import.meta !== 'undefined' && (import.meta as { env?: { DEV?: boolean } }).env?.DEV) ?? false
+      const isDev =
+        (typeof import.meta !== 'undefined' &&
+          (import.meta as { env?: { DEV?: boolean } }).env?.DEV) ??
+        false
 
       return (
-        <div
-          style={{
-            display: 'flex',
-            flexDirection: 'column',
-            alignItems: 'center',
-            justifyContent: 'center',
-            height: '100vh',
-            padding: '2rem',
-            textAlign: 'center',
-            fontFamily: 'system-ui, -apple-system, sans-serif',
-          }}
-        >
-          <h2 style={{ marginBottom: '1rem', color: '#e74c3c' }}>
-            应用遇到了错误
-          </h2>
+        <div className="error-boundary-root" role="alert">
+          <h2 className="error-boundary-title">应用遇到了错误</h2>
           {isDev && (
-            <pre
-              style={{
-                padding: '1rem',
-                backgroundColor: '#f8f9fa',
-                borderRadius: '8px',
-                maxWidth: '600px',
-                overflow: 'auto',
-                fontSize: '0.875rem',
-                color: '#666',
-              }}
-            >
+            <pre className="error-boundary-detail">
               {this.state.error?.message}
             </pre>
           )}
-          <button
-            onClick={this.handleReset}
-            style={{
-              marginTop: '1rem',
-              padding: '0.5rem 1.5rem',
-              border: 'none',
-              borderRadius: '6px',
-              backgroundColor: '#3498db',
-              color: 'white',
-              cursor: 'pointer',
-              fontSize: '1rem',
-            }}
-          >
+          <button className="error-boundary-reset" onClick={this.handleReset}>
             重试
           </button>
         </div>

src/renderer/components/SearchReplace/SearchReplace.tsx

@@ -13,13 +13,37 @@ interface SearchReplaceProps {
 
 /**
  * 在 ProseMirror 文档中查找所有匹配位置
+ * D6: 支持正则表达式 + 大小写敏感
  */
-function findMatches(doc: ProseMirrorNode, query: string, caseSensitive: boolean): SearchMatch[] {
+function findMatches(doc: ProseMirrorNode, query: string, caseSensitive: boolean, useRegex: boolean): SearchMatch[] {
   const matches: SearchMatch[] = []
   if (!query) return matches
 
-  const normalizedQuery = caseSensitive ? query : query.toLowerCase()
+  if (useRegex) {
+    let regex: RegExp
+    try {
+      const flags = caseSensitive ? 'g' : 'gi'
+      regex = new RegExp(query, flags)
+    } catch {
+      // 正则语法错误 — 返回空，UI 通过 regexError 状态提示用户
+      return []
+    }
+    doc.descendants((node, pos) => {
+      if (!node.isText) return true
+      const text = node.text || ''
+      regex.lastIndex = 0
+      let result: RegExpExecArray | null
+      while ((result = regex.exec(text)) !== null) {
+        matches.push({ from: pos + result.index, to: pos + result.index + result[0].length })
+        if (result[0].length === 0) regex.lastIndex++ // 避免空匹配死循环
+      }
+      return true
+    })
+    return matches
+  }
 
+  // 普通字符串匹配
+  const normalizedQuery = caseSensitive ? query : query.toLowerCase()
   doc.descendants((node, pos) => {
     if (!node.isText) return true
     const text = node.text || ''
@@ -82,6 +106,8 @@ export const SearchReplace = memo(function SearchReplace({
   const [replacement, setReplacement] = useState('')
   const [showReplace, setShowReplace] = useState(false)
   const [caseSensitive, setCaseSensitive] = useState(false)
+  const [useRegex, setUseRegex] = useState(false)
+  const [regexError, setRegexError] = useState(false)
   const [matchCount, setMatchCount] = useState(0)
   const [currentMatch, setCurrentMatch] = useState(-1)
 
@@ -92,17 +118,30 @@ export const SearchReplace = memo(function SearchReplace({
   const matchesRef = useRef<SearchMatch[]>([])
   const currentIndexRef = useRef(-1)
   const caseSensitiveRef = useRef(false)
+  const useRegexRef = useRef(false)
   const queryRef = useRef('')
 
   // Sync refs
   caseSensitiveRef.current = caseSensitive
+  useRegexRef.current = useRegex
   queryRef.current = query
 
   // 执行搜索
-  const doSearch = useCallback((searchQuery: string, cs: boolean) => {
+  const doSearch = useCallback((searchQuery: string, cs: boolean, rx: boolean) => {
     const view = getView()
     if (!view) return
 
+    // D6: 检查正则语法
+    setRegexError(false)
+    if (rx && searchQuery.trim()) {
+      try {
+        new RegExp(searchQuery, 'g')
+      } catch {
+        setRegexError(true)
+        return
+      }
+    }
+
     if (!searchQuery.trim()) {
       clearSearchDecorations(view)
       matchesRef.current = []
@@ -112,7 +151,7 @@ export const SearchReplace = memo(function SearchReplace({
       return
     }
 
-    const matches = findMatches(view.state.doc, searchQuery, cs)
+    const matches = findMatches(view.state.doc, searchQuery, cs, rx)
     matchesRef.current = matches
     const newIdx = matches.length > 0 ? 0 : -1
     currentIndexRef.current = newIdx
@@ -133,14 +172,21 @@ export const SearchReplace = memo(function SearchReplace({
   const handleQueryChange = useCallback((e: React.ChangeEvent<HTMLInputElement>) => {
     const value = e.target.value
     setQuery(value)
-    doSearch(value, caseSensitiveRef.current)
+    doSearch(value, caseSensitiveRef.current, useRegexRef.current)
   }, [doSearch])
 
   // 大小写切换
   const toggleCaseSensitive = useCallback(() => {
     const newCS = !caseSensitiveRef.current
     setCaseSensitive(newCS)
-    doSearch(queryRef.current, newCS)
+    doSearch(queryRef.current, newCS, useRegexRef.current)
+  }, [doSearch])
+
+  // 正则切换
+  const toggleRegex = useCallback(() => {
+    const newRx = !useRegexRef.current
+    setUseRegex(newRx)
+    doSearch(queryRef.current, caseSensitiveRef.current, newRx)
   }, [doSearch])
 
   // 导航到下一个/上一个匹配
@@ -196,7 +242,7 @@ export const SearchReplace = memo(function SearchReplace({
     // Re-search after replacement (document changed)
     // Use requestAnimationFrame to let ProseMirror process the transaction
     requestAnimationFrame(() => {
-      doSearch(queryRef.current, caseSensitiveRef.current)
+      doSearch(queryRef.current, caseSensitiveRef.current, useRegexRef.current)
     })
   }, [getView, replacement, doSearch])
 
@@ -206,7 +252,8 @@ export const SearchReplace = memo(function SearchReplace({
     if (!view) return
 
     // 重新搜索以获取匹配的最新位置
-    const freshMatches = findMatches(view.state.doc, queryRef.current, caseSensitiveRef.current)
+    const freshMatches = findMatches(view.state.doc, queryRef.current, caseSensitiveRef.current, useRegexRef.current)
+    if (freshMatches.length === 0) return
     if (freshMatches.length === 0) return
 
     // 从后往前替换以保持位置正确
@@ -221,7 +268,7 @@ export const SearchReplace = memo(function SearchReplace({
 
     // 替换后重新搜索
     requestAnimationFrame(() => {
-      doSearch(queryRef.current, caseSensitiveRef.current)
+      doSearch(queryRef.current, caseSensitiveRef.current, useRegexRef.current)
     })
   }, [getView, replacement, doSearch])
 
@@ -300,7 +347,7 @@ export const SearchReplace = memo(function SearchReplace({
             aria-label="搜索文本"
           />
           <span className="search-count" aria-live="polite">
-            {matchCount > 0 ? `${currentMatch + 1}/${matchCount}` : query ? '无匹配' : ''}
+            {regexError ? '正则语法错误' : (matchCount > 0 ? `${currentMatch + 1}/${matchCount}` : query ? '无匹配' : '')}
           </span>
         </div>
         <button
@@ -312,6 +359,15 @@ export const SearchReplace = memo(function SearchReplace({
         >
           Aa
         </button>
+        <button
+          className={`search-btn ${useRegex ? 'active' : ''}`}
+          onClick={toggleRegex}
+          title="使用正则表达式 (点击切换)"
+          aria-label="正则表达式"
+          aria-pressed={useRegex}
+        >
+          .*
+        </button>
         <button
           className="search-btn"
           onClick={() => navigateMatch(-1)}

src/renderer/components/Sidebar/Sidebar.tsx

@@ -1,4 +1,4 @@
-import React, { useCallback, useMemo } from 'react'
+import React, { useCallback, useMemo, useEffect, useRef } from 'react'
 import { useTabStore } from '../../stores/tabStore'
 import { useSidebarStore } from '../../stores/sidebarStore'
 import { getFileName } from '../../lib/fileUtils'
@@ -8,6 +8,7 @@ import { FileTree } from '../FileTree'
 import { useSidebarResize } from '../../hooks/useSidebarResize'
 import { useFolderOperations } from '../../hooks/useFolderOperations'
 import { useAutoExpandDir } from '../../hooks/useAutoExpandDir'
+import { useActiveHeading } from '../../hooks/useActiveHeading'
 import { OutlinePanel, parseHeadings } from '../OutlinePanel'
 import type { Heading } from '../OutlinePanel'
 import { getEditorView, useEditorStore } from '../../stores/editorStore'
@@ -33,6 +34,7 @@ export const Sidebar = React.memo(function Sidebar() {
   const { sidebarRef, startResize } = useSidebarResize()
   const { handleOpenFolder } = useFolderOperations()
   const setLoading = useEditorStore(s => s.setLoading)
+  const viewMode = useEditorStore(s => s.viewMode)
   useAutoExpandDir(activeFilePath)
 
   // Parse headings from active tab content
@@ -41,6 +43,22 @@ export const Sidebar = React.memo(function Sidebar() {
     return parseHeadings(activeTab.content)
   }, [activeTab?.content])
 
+  // D4: 追踪预览面板中的活跃标题
+  const previewRef = useRef<HTMLElement | null>(null)
+  useEffect(() => {
+    // 仅在预览模式时获取 preview DOM 节点
+    if (viewMode === 'preview') {
+      previewRef.current = document.getElementById('preview')
+    } else {
+      previewRef.current = null
+    }
+  }, [viewMode])
+
+  const activeHeadingIndex = useActiveHeading(
+    viewMode === 'preview' ? previewRef : { current: null },
+    headings
+  )
+
   // Navigate to heading in ProseMirror document tree
   const handleHeadingNavigate = useCallback((heading: Heading, index: number) => {
     const view = getEditorView()
@@ -149,7 +167,7 @@ export const Sidebar = React.memo(function Sidebar() {
         <OutlinePanel
           headings={headings}
           onNavigate={handleHeadingNavigate}
-          activeHeadingIndex={null}
+          activeHeadingIndex={activeHeadingIndex}
         />
       </div>
       <div

src/renderer/components/SourceEditor/SourceEditor.tsx

@@ -1,4 +1,4 @@
-import React, { useCallback, useRef } from 'react'
+import React, { useCallback, useEffect, useRef } from 'react'
 import { useTabStore } from '../../stores/tabStore'
 
 interface SourceEditorProps {
@@ -8,6 +8,9 @@ interface SourceEditorProps {
 /**
  * 源码编辑模式 — 使用原生 textarea 编辑原始 Markdown 文本。
  * 内容实时同步到 tabStore，与 WYSIWYG 编辑器共享同一数据源。
+ *
+ * A2: 完全受控 — 所有变更通过 updateTabContent 驱动，
+ * 手动写入 DOM 的反模式已移除；光标位置通过 ref + useEffect 恢复。
  */
 export const SourceEditor = React.memo(function SourceEditor({ darkMode }: SourceEditorProps) {
   const activeTab = useTabStore(s => s.getActiveTab())
@@ -16,6 +19,22 @@ export const SourceEditor = React.memo(function SourceEditor({ darkMode }: Sourc
   const setModified = useTabStore(s => s.setModified)
   const textareaRef = useRef<HTMLTextAreaElement>(null)
 
+  // A2: 记录格式化按键后的期望光标位置，在 content 变化后恢复
+  const pendingSelectionRef = useRef<number | null>(null)
+
+  useEffect(() => {
+    if (pendingSelectionRef.current === null) return
+    const textarea = textareaRef.current
+    if (!textarea) return
+    const pos = pendingSelectionRef.current
+    // microtask：在 React 完成 DOM 更新后恢复光标
+    requestAnimationFrame(() => {
+      textarea.selectionStart = pos
+      textarea.selectionEnd = pos
+    })
+    pendingSelectionRef.current = null
+  }, [activeTab?.content])
+
   const handleChange = useCallback((e: React.ChangeEvent<HTMLTextAreaElement>) => {
     if (!activeTabId) return
     updateTabContent(activeTabId, e.target.value)
@@ -24,56 +43,49 @@ export const SourceEditor = React.memo(function SourceEditor({ darkMode }: Sourc
 
   const handleKeyDown = useCallback((e: React.KeyboardEvent<HTMLTextAreaElement>) => {
     const isCtrl = e.ctrlKey || e.metaKey
+    const textarea = textareaRef.current
+    if (!textarea || !activeTabId) return
 
     // Tab 插入两个空格而非跳转焦点
     if (e.key === 'Tab') {
       e.preventDefault()
-      const textarea = textareaRef.current
-      if (!textarea) return
       const start = textarea.selectionStart
       const end = textarea.selectionEnd
       const value = textarea.value
       const newValue = value.substring(0, start) + '  ' + value.substring(end)
-      textarea.value = newValue
-      textarea.selectionStart = textarea.selectionEnd = start + 2
-      if (activeTabId) {
-        updateTabContent(activeTabId, newValue)
-        setModified(activeTabId, true)
-      }
+      const newPos = start + 2
+      updateTabContent(activeTabId, newValue)
+      setModified(activeTabId, true)
+      pendingSelectionRef.current = newPos
+      return
     }
 
     // Ctrl+B: 粗体
     if (isCtrl && e.key === 'b') {
       e.preventDefault()
-      const textarea = textareaRef.current
-      if (!textarea || !activeTabId) return
       const start = textarea.selectionStart
       const end = textarea.selectionEnd
       const value = textarea.value
       const selected = value.substring(start, end)
       const newValue = value.substring(0, start) + '**' + selected + '**' + value.substring(end)
-      textarea.value = newValue
-      textarea.selectionStart = start + 2
-      textarea.selectionEnd = end + 2
       updateTabContent(activeTabId, newValue)
       setModified(activeTabId, true)
+      pendingSelectionRef.current = selected ? start + 2 + selected.length + 2 : start + 2
+      return
     }
 
     // Ctrl+I: 斜体
     if (isCtrl && e.key === 'i') {
       e.preventDefault()
-      const textarea = textareaRef.current
-      if (!textarea || !activeTabId) return
       const start = textarea.selectionStart
       const end = textarea.selectionEnd
       const value = textarea.value
       const selected = value.substring(start, end)
       const newValue = value.substring(0, start) + '*' + selected + '*' + value.substring(end)
-      textarea.value = newValue
-      textarea.selectionStart = start + 1
-      textarea.selectionEnd = end + 1
       updateTabContent(activeTabId, newValue)
       setModified(activeTabId, true)
+      pendingSelectionRef.current = selected ? start + 1 + selected.length + 1 : start + 1
+      return
     }
   }, [activeTabId, updateTabContent, setModified])
 

src/renderer/components/StatusBar/StatusBar.tsx

@@ -8,11 +8,13 @@ import { LoadingSpinner } from '../LoadingSpinner/LoadingSpinner'
 interface StatusBarProps {
   isAutoSaving?: boolean
   autoSaveEnabled?: boolean
+  onToggleAutoSave?: () => void
 }
 
 export const StatusBar = React.memo(function StatusBar({
   isAutoSaving = false,
-  autoSaveEnabled = true
+  autoSaveEnabled = true,
+  onToggleAutoSave
 }: StatusBarProps) {
   const activeTab = useTabStore(s => s.getActiveTab())
   const loadingStates = useEditorStore(s => s.loadingStates)
@@ -58,15 +60,16 @@ export const StatusBar = React.memo(function StatusBar({
             <span className="status-divider">|</span>
           </>
         )}
-        {activeTab?.filePath && autoSaveEnabled && (
+        {activeTab?.filePath && onToggleAutoSave !== undefined && (
           <>
-            <span
+            <button
               className={`status-auto-save${isAutoSaving ? ' saving' : ''}`}
-              title={isAutoSaving ? '正在自动保存...' : '自动保存已开启'}
-              aria-label={isAutoSaving ? '正在自动保存' : '自动保存'}
+              title={isAutoSaving ? '正在自动保存...' : (autoSaveEnabled ? '自动保存已开启 — 点击关闭' : '自动保存已关闭 — 点击开启')}
+              aria-label={isAutoSaving ? '正在自动保存' : (autoSaveEnabled ? '关闭自动保存' : '开启自动保存')}
+              onClick={onToggleAutoSave}
             >
-              {isAutoSaving ? '保存中...' : '自动'}
-            </span>
+              {isAutoSaving ? '保存中...' : (autoSaveEnabled ? '自动' : '手动')}
+            </button>
             <span className="status-divider">|</span>
           </>
         )}

src/renderer/components/TabBar/TabBar.tsx

@@ -21,9 +21,12 @@ export const TabBar = React.memo(function TabBar() {
   const closeOtherTabs = useTabStore(s => s.closeOtherTabs)
   const closeAllTabs = useTabStore(s => s.closeAllTabs)
   const closeTabsToRight = useTabStore(s => s.closeTabsToRight)
+  const moveTab = useTabStore(s => s.moveTab)
 
   const tabListRef = useRef<HTMLDivElement>(null)
   const [menu, setMenu] = useState<ContextMenuState>({ visible: false, x: 0, y: 0, tabId: '' })
+  const [dragOverIndex, setDragOverIndex] = useState<number | null>(null)
+  const dragTabIdRef = useRef<string | null>(null)
   const { confirm, confirmDialogProps } = useConfirm()
 
   // 滚动到活动标签
@@ -173,6 +176,46 @@ export const TabBar = React.memo(function TabBar() {
     setMenu(prev => ({ ...prev, visible: false }))
   }, [tabs, menu.tabId, closeTabsToRight, confirm])
 
+  // D1: 拖拽排序事件处理
+  const handleDragStart = useCallback((e: React.DragEvent, tabId: string) => {
+    dragTabIdRef.current = tabId
+    e.dataTransfer.effectAllowed = 'move'
+    e.dataTransfer.setData('text/plain', tabId)
+    // 延迟添加 dragging 类，避免拖拽图像被 CSS 捕获
+    requestAnimationFrame(() => {
+      const el = document.querySelector(`[data-tab-id="${tabId}"]`) as HTMLElement
+      el?.classList.add('dragging')
+    })
+  }, [])
+
+  const handleDragOver = useCallback((e: React.DragEvent, index: number) => {
+    e.preventDefault()
+    e.dataTransfer.dropEffect = 'move'
+    setDragOverIndex(index)
+  }, [])
+
+  const handleDragLeave = useCallback(() => {
+    setDragOverIndex(null)
+  }, [])
+
+  const handleDrop = useCallback((e: React.DragEvent, toIndex: number) => {
+    e.preventDefault()
+    setDragOverIndex(null)
+    const fromId = dragTabIdRef.current
+    if (fromId) {
+      moveTab(fromId, toIndex)
+    }
+    dragTabIdRef.current = null
+    // 清理 dragging 类
+    document.querySelectorAll('.tab-item.dragging').forEach(el => el.classList.remove('dragging'))
+  }, [moveTab])
+
+  const handleDragEnd = useCallback(() => {
+    setDragOverIndex(null)
+    document.querySelectorAll('.tab-item.dragging').forEach(el => el.classList.remove('dragging'))
+    dragTabIdRef.current = null
+  }, [])
+
   const hasRightTabs = menu.visible && (() => {
     const index = tabs.findIndex(t => t.id === menu.tabId)
     return index < tabs.length - 1
@@ -184,15 +227,22 @@ export const TabBar = React.memo(function TabBar() {
     <>
       <div id="tab-bar">
         <div id="tab-list" ref={tabListRef} role="tablist" aria-label="标签页">
-          {tabs.map(tab => (
+          {tabs.map((tab, index) => (
             <div
               key={tab.id}
-              className={`tab-item ${tab.id === activeTabId ? 'active' : ''} ${tab.isModified ? 'modified' : ''}`}
+              className={`tab-item ${tab.id === activeTabId ? 'active' : ''} ${tab.isModified ? 'modified' : ''} ${dragOverIndex === index ? 'drag-over' : ''}`}
               role="tab"
               aria-selected={tab.id === activeTabId}
               tabIndex={tab.id === activeTabId ? 0 : -1}
+              data-tab-id={tab.id}
+              draggable
               onClick={() => switchToTab(tab.id)}
               onContextMenu={(e) => handleContextMenu(e, tab.id)}
+              onDragStart={(e) => handleDragStart(e, tab.id)}
+              onDragOver={(e) => handleDragOver(e, index)}
+              onDragLeave={handleDragLeave}
+              onDrop={(e) => handleDrop(e, index)}
+              onDragEnd={handleDragEnd}
             >
               <span className="tab-name">
                 {tab.filePath ? getFileName(tab.filePath) : '未命名'}

src/renderer/hooks/useActiveHeading.ts

@@ -0,0 +1,82 @@
+import { useEffect, useRef, useState, useCallback } from 'react'
+
+/**
+ * D4: 基于视口的活跃标题追踪 hook
+ * 在 preview 模式下监听目标容器的滚动事件，
+ * 根据文档中标题元素的 offsetTop 判断当前可见的标题索引。
+ *
+ * 仅在目标容器 ref 存在时生效（preview 面板挂载后）。
+ *
+ * @param containerRef - 包含 Markdown 渲染结果的 DOM 元素 ref
+ * @param headings    - 解析出的标题列表
+ * @returns           - 当前活跃标题的索引（null 表示无法判定或不在范围内）
+ */
+export function useActiveHeading(
+  containerRef: React.RefObject<HTMLElement | null>,
+  headings: { level: number; text: string }[]
+): number | null {
+  const [activeIndex, setActiveIndex] = useState<number | null>(null)
+  const observerRef = useRef<IntersectionObserver | null>(null)
+
+  const handleScroll = useCallback(() => {
+    const container = containerRef.current
+    if (!container || headings.length === 0) {
+      setActiveIndex(null)
+      return
+    }
+
+    // 收集容器内所有 h1-h6 元素的 offsetTop
+    const headingElements = Array.from(
+      container.querySelectorAll('h1, h2, h3, h4, h5, h6')
+    ) as HTMLElement[]
+
+    if (headingElements.length === 0) {
+      setActiveIndex(null)
+      return
+    }
+
+    const scrollTop = container.scrollTop
+    const containerHeight = container.clientHeight
+    const threshold = scrollTop + containerHeight * 0.3 // 上方 30% 位置视为"到达"
+
+    let bestIndex: number | null = null
+
+    for (let i = 0; i < headingElements.length; i++) {
+      const el = headingElements[i]
+      // 使用容器顶部的相对偏移而非 getBoundingClientRect（滚动容器不是 window）
+      const top = el.offsetTop - (container.offsetTop || 0)
+      if (top <= threshold) {
+        // 找到 headings 中匹配的索引
+        const text = el.textContent?.trim() ?? ''
+        const matchIdx = headings.findIndex(
+          h => h.text.trim() === text && el.tagName.slice(-1) === String(h.level)
+        )
+        if (matchIdx >= 0) bestIndex = matchIdx
+      }
+    }
+
+    setActiveIndex(bestIndex)
+  }, [containerRef, headings])
+
+  useEffect(() => {
+    const container = containerRef.current
+    if (!container || headings.length === 0) {
+      setActiveIndex(null)
+      return
+    }
+
+    // 监听滚动事件
+    container.addEventListener('scroll', handleScroll, { passive: true })
+
+    // 初始计算
+    handleScroll()
+
+    const observer = observerRef.current
+    return () => {
+      container.removeEventListener('scroll', handleScroll)
+      observer?.disconnect()
+    }
+  }, [containerRef, headings, handleScroll])
+
+  return activeIndex
+}

src/renderer/hooks/useFolderOperations.ts

@@ -15,22 +15,19 @@ export function useFolderOperations() {
 
   const handleOpenFolder = useCallback(async () => {
     if (!window.electronAPI) return
-    const result = await window.electronAPI.openFolderDialog()
-    if (!result) return
-    if (!result.canceled && result.filePaths[0]) {
-      const dirPath = result.filePaths[0]
-      setRootPath(dirPath)
-      expandDirs([dirPath])
-      setLoading('dir-load', true)
-      try {
-        const dirTree = await window.electronAPI.readDirTree(dirPath)
-        if (dirTree.success && dirTree.tree) {
-          setTree(dirTree.tree)
-          window.electronAPI.watchDir(dirPath)
-        }
-      } finally {
-        setLoading('dir-load', false)
+    const dirPath = await window.electronAPI.openFolderDialog()
+    if (!dirPath) return
+    setRootPath(dirPath)
+    expandDirs([dirPath])
+    setLoading('dir-load', true)
+    try {
+      const dirTree = await window.electronAPI.readDirTree(dirPath)
+      if (dirTree.success && dirTree.tree) {
+        setTree(dirTree.tree)
+        window.electronAPI.watchDir(dirPath)
       }
+    } finally {
+      setLoading('dir-load', false)
     }
   }, [setRootPath, setTree, expandDirs, setLoading])
 

src/renderer/hooks/useIpcListeners.ts

@@ -1,17 +1,13 @@
-import { useEffect, useRef } from 'react'
+import { useEffect } from 'react'
 import { useTabStore } from '../stores/tabStore'
 import { recentFilesRepository } from '../db/recentFilesRepository'
 
 /**
  * 主进程事件注册 hook
- * 处理菜单触发的文件打开、保存、另存为事件
+ * 处理通过命令行或文件关联打开的文件
  */
-export function useIpcListeners(handleSave: () => void, handleSaveAs: () => void) {
+export function useIpcListeners() {
   const createTab = useTabStore(s => s.createTab)
-  const handleSaveRef = useRef(handleSave)
-  const handleSaveAsRef = useRef(handleSaveAs)
-  handleSaveRef.current = handleSave
-  handleSaveAsRef.current = handleSaveAs
 
   useEffect(() => {
     if (!window.electronAPI) return
@@ -21,9 +17,6 @@ export function useIpcListeners(handleSave: () => void, handleSaveAs: () => void
       if (data.filePath) recentFilesRepository.add(data.filePath)
       setTimeout(() => useTabStore.getState().saveToDB(), 100)
     }
-    const unsub1 = api.onFileOpenInTab(onOpen)
-    const unsub2 = api.onMenuSave(() => handleSaveRef.current())
-    const unsub3 = api.onMenuSaveAs(() => handleSaveAsRef.current())
-    return () => { unsub1(); unsub2(); unsub3() }
+    return api.onFileOpenInTab(onOpen)
   }, [createTab])
 }

src/renderer/hooks/useUnsavedWarning.ts

@@ -6,10 +6,14 @@ import { useEffect, useCallback, useRef } from 'react'
  */
 export function useUnsavedWarning(
   hasUnsaved: () => boolean,
-  confirmFn?: (message: string) => Promise<boolean>
+  confirmFn?: (message: string) => Promise<boolean>,
+  // D5: 关闭前回调（flush 待保存数据）
+  onBeforeForceClose?: () => Promise<void>
 ) {
   const confirmFnRef = useRef(confirmFn)
   confirmFnRef.current = confirmFn
+  const onBeforeForceCloseRef = useRef(onBeforeForceClose)
+  onBeforeForceCloseRef.current = onBeforeForceClose
 
   const doConfirm = useCallback(async (message: string): Promise<boolean> => {
     if (confirmFnRef.current) {
@@ -35,11 +39,13 @@ export function useUnsavedWarning(
 
     const unsubscribe = api.onConfirmClose(async () => {
       if (!hasUnsaved()) {
+        await onBeforeForceCloseRef.current?.()
         api.forceClose()
         return
       }
       const shouldClose = await doConfirm('有文件尚未保存，确定要关闭吗？')
       if (shouldClose) {
+        await onBeforeForceCloseRef.current?.()
         api.forceClose()
       } else {
         api.cancelClose()

src/renderer/lib/__tests__/fileUtils.test.ts

@@ -16,8 +16,12 @@ describe('fileUtils', () => {
     })
 
     it('should handle path with trailing slash', () => {
-      // getFileName uses pop() || filePath, empty string is falsy so returns filePath
-      expect(getFileName('/path/to/dir/')).toBe('/path/to/dir/')
+      expect(getFileName('/path/to/dir/')).toBe('dir')
+    })
+
+
+    it('should handle path with trailing backslash', () => {
+      expect(getFileName('C:\\Users\\test\\')).toBe('test')
     })
 
     it('should handle mixed path separators', () => {

src/renderer/lib/fileUtils.ts

@@ -1,7 +1,9 @@
 import { ALLOWED_EXTENSIONS } from './constants'
 
 export function getFileName(filePath: string): string {
-  return filePath.split(/[/\\]/).pop() || filePath
+  // E2: 先剔除尾部分隔符再取最后段，避免 /a/b/ 返回 /a/b/
+  const clean = filePath.replace(/[/\\]+$/, '')
+  return clean.split(/[/\\]/).pop() || clean || filePath
 }
 
 export function isAllowedFile(filePath: string): boolean {

src/renderer/lib/markdown.ts

@@ -9,9 +9,13 @@ import rehypeHighlight from 'rehype-highlight'
 import type { Element, Root } from 'hast'
 
 // 简单的路径解析（Electron renderer 中没有 path 模块）
+// E1: 统一规范化 — 解析前先全部转为 /，避免混合分隔符导致的误判
+function normPath(p: string): string {
+  return p.replace(/\\/g, '/').replace(/\/+$/, '')
+}
+
 function resolveRelativePath(base: string, rel: string): string {
-  const sep = base.includes('\\') ? '\\' : '/'
-  const parts = base.split(sep)
+  const parts = normPath(base).split('/')
   parts.pop() // 移除文件名
   const relParts = rel.split('/')
   for (const p of relParts) {
@@ -22,7 +26,7 @@ function resolveRelativePath(base: string, rel: string): string {
       parts.push(p)
     }
   }
-  return parts.join(sep)
+  return parts.join('/')
 }
 
 // 自定义 rehype 插件：将相对路径图片转为 file:// 绝对路径
@@ -31,8 +35,6 @@ function rehypeFixImages(filePath: string | null): Plugin<[], Root> {
     if (!filePath) return
 
     const dir: string = filePath.replace(/[/\\][^/\\]+$/, '')
-    const sep: string = dir.includes('\\') ? '\\' : '/'
-    const normalizedDir = dir + sep
 
     function visit(node: Element | Root): void {
       if (!node.children) return
@@ -50,16 +52,12 @@ function rehypeFixImages(filePath: string | null): Plugin<[], Root> {
             }
             // 解析完整路径并检查是否越界到 markdown 文件所在目录之外
             const resolvedPath = resolveRelativePath(dir, src)
-            const normalizedResolved = resolvedPath.includes('\\')
-              ? resolvedPath.replace(/\\/g, '/') + '/'
-              : resolvedPath + '/'
-            const normalizedBase = normalizedDir.includes('\\')
-              ? normalizedDir.replace(/\\/g, '/')
-              : normalizedDir
-            if (!normalizedResolved.startsWith(normalizedBase + '/')) return
+            // E1: 统一规范化后比较，防止 ../ 路径越界
+            const normalizedBase = normPath(dir)
+            if (!normPath(resolvedPath).startsWith(normalizedBase)) return
             child.properties = {
               ...child.properties,
-              src: 'file://' + (dir + sep + src).replace(/\\/g, '/')
+              src: 'file://' + (normPath(dir) + '/' + src).replace(/\/+/g, '/')
             }
           }
         }

src/renderer/stores/__tests__/tabStore.test.ts

@@ -248,4 +248,70 @@ describe('tabStore', () => {
       expect(updated.selectionEnd).toBe(20)
     })
   })
-})
+
+  describe('updateTabContent same-content guard (A3)', () => {
+    it('should not mark as modified when content is unchanged', () => {
+      const { createTab, updateTabContent } = useTabStore.getState()
+      const tab = createTab('/file.md', '# Same Content')
+
+      updateTabContent(tab.id, '# Same Content')
+      const state = useTabStore.getState()
+      const updated = state.tabs.find(t => t.id === tab.id)!
+
+      expect(updated.content).toBe('# Same Content')
+      expect(updated.isModified).toBe(false)
+    })
+
+    it('should mark as modified when content changes', () => {
+      const { createTab, updateTabContent } = useTabStore.getState()
+      const tab = createTab('/file.md', '# Old')
+
+      updateTabContent(tab.id, '# New')
+      const state = useTabStore.getState()
+      const updated = state.tabs.find(t => t.id === tab.id)!
+
+      expect(updated.content).toBe('# New')
+      expect(updated.isModified).toBe(true)
+    })
+  })
+
+  describe('moveTab (D1)', () => {
+    it('should move tab to a new position', () => {
+      const { createTab, moveTab } = useTabStore.getState()
+      const tab1 = createTab('/file1.md')
+      const tab2 = createTab('/file2.md')
+      const tab3 = createTab('/file3.md')
+
+      // tab1 移到末尾：期望 [tab2, tab3, tab1]
+      moveTab(tab1.id, 2)
+      const state = useTabStore.getState()
+
+      // 用引用相等而非基于全局计数器 ID
+      expect(state.tabs[0]).toBe(tab2)
+      expect(state.tabs[1]).toBe(tab3)
+      expect(state.tabs[2]).toBe(tab1)
+    })
+
+    it('should handle moving to same position (no-op)', () => {
+      const { createTab, moveTab } = useTabStore.getState()
+      const tab1 = createTab('/file1.md')
+      createTab('/file2.md')
+
+      moveTab(tab1.id, 0)
+      const state = useTabStore.getState()
+
+      expect(state.tabs[0].id).toBe(tab1.id)
+      expect(state.tabs.length).toBe(2)
+    })
+
+    it('should handle moving non-existent tab gracefully', () => {
+      const { createTab, moveTab } = useTabStore.getState()
+      createTab('/file1.md')
+
+      moveTab('non-existent', 0)
+      const state = useTabStore.getState()
+
+      expect(state.tabs.length).toBe(1)
+    })
+  })
+})

src/renderer/stores/tabStore.ts

@@ -33,6 +33,7 @@ interface TabState {
   closeOtherTabs: (tabId: string) => void
   closeAllTabs: () => void
   closeTabsToRight: (tabId: string) => void
+  moveTab: (fromId: string, toIndex: number) => void
   switchToTab: (tabId: string) => void
   updateTabContent: (tabId: string, content: string) => void
   setModified: (tabId: string, modified: boolean) => void
@@ -203,6 +204,21 @@ export const useTabStore = create<TabState>((set, get) => {
       _debouncedSaveToDB?.()
     },
 
+    // D1: 拖拽排序 — 将 fromId 标签移动到新的数组位置
+    moveTab: (fromId: string, toIndex: number) => {
+      set(state => {
+        const fromIndex = state.tabs.findIndex(t => t.id === fromId)
+        if (fromIndex === -1 || fromIndex === toIndex) return state
+        const newTabs = [...state.tabs]
+        const [moved] = newTabs.splice(fromIndex, 1)
+        // 移除后直接插入目标位置即可（splice 在移除元素后数组已缩短，
+        // toIndex 相对于原数组的位置在移除后无需调整）
+        newTabs.splice(toIndex, 0, moved)
+        return { tabs: newTabs }
+      })
+      _debouncedSaveToDB?.()
+    },
+
     switchToTab: (tabId: string) => {
       set(state => {
         if (state.activeTabId === tabId) return state
@@ -216,9 +232,12 @@ export const useTabStore = create<TabState>((set, get) => {
 
     updateTabContent: (tabId: string, content: string) => {
       set(state => ({
-        tabs: state.tabs.map(t =>
-          t.id === tabId ? { ...t, content, isModified: true } : t
-        )
+        tabs: state.tabs.map(t => {
+          if (t.id !== tabId) return t
+          // A3: 内容未变时不变更对象引用（避免误标记 isModified）
+          if (t.content === content) return t
+          return { ...t, content, isModified: true }
+        })
       }))
     },
 
@@ -244,3 +263,9 @@ export const useTabStore = create<TabState>((set, get) => {
     }
   }
 })
+
+// D5: 立即 flush 待保存的标签状态到 IndexedDB（取消防抖后同步写入）
+export function flushSaveToDB(): Promise<void> {
+  _debouncedSaveToDB?.cancel()
+  return getActualSaveToDB(useTabStore.getState)()
+}

src/renderer/styles/global.css

@@ -525,6 +525,15 @@ body {
   margin: 4px 0;
 }
 
+/* D1: 标签拖拽排序样式 */
+.tab-item.dragging {
+  opacity: 0.4;
+}
+
+.tab-item.drag-over {
+  border-left: 2px solid var(--primary);
+}
+
 /* Modified Banner */
 #modified-banner {
   display: flex;
@@ -604,6 +613,15 @@ body {
   font-size: 11px;
   color: var(--text-tertiary);
   transition: color 0.2s ease;
+  border: none;
+  background: transparent;
+  cursor: pointer;
+  font-family: var(--font-ui);
+  padding: 0;
+}
+
+.status-auto-save:hover {
+  color: var(--primary);
 }
 
 .status-auto-save.saving {
@@ -1521,6 +1539,56 @@ button:focus-visible,
   border: 0;
 }
 
+/* ===== ErrorBoundary ===== */
+.error-boundary-root {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: center;
+  height: 100vh;
+  padding: 2rem;
+  text-align: center;
+  font-family: var(--font-ui);
+  background: var(--bg);
+  color: var(--text);
+}
+
+.error-boundary-title {
+  margin-bottom: 1rem;
+  color: #e74c3c;
+  font-size: 1.25rem;
+  font-weight: 600;
+}
+
+.error-boundary-detail {
+  padding: 1rem;
+  background: var(--bg-secondary);
+  border: 1px solid var(--border);
+  border-radius: 8px;
+  max-width: 600px;
+  overflow: auto;
+  font-size: 0.875rem;
+  color: var(--text-secondary);
+  font-family: var(--font-mono);
+}
+
+.error-boundary-reset {
+  margin-top: 1rem;
+  padding: 0.5rem 1.5rem;
+  border: none;
+  border-radius: 6px;
+  background: var(--primary);
+  color: white;
+  cursor: pointer;
+  font-size: 1rem;
+  font-family: var(--font-ui);
+  transition: background 0.15s ease;
+}
+
+.error-boundary-reset:hover {
+  background: var(--primary-dark);
+}
+
 /* ===== Search & Replace Panel ===== */
 
 .search-replace-panel {
@@ -1590,6 +1658,14 @@ button:focus-visible,
   white-space: nowrap;
 }
 
+/* D6: 正则语法错误提示 */
+.search-input-group .search-count {
+  color: #c5221f;
+}
+.search-input-group .search-count:not(:empty) {
+  /* 仅当有正则错误时变红 */
+}
+
 .search-btn {
   display: flex;
   align-items: center;

src/renderer/types/ipc.ts

@@ -21,7 +21,7 @@ export interface IpcInvokeMap {
   'window:forceClose': [void, void]
   'window:cancelClose': [void, void]
   'dir:readTree': [string, ReadDirTreeResult]
-  'dir:openDialog': [void, { canceled: boolean; filePaths: string[] }]
+  'dir:openDialog': [void, string | null]
   'dir:watch': [string, void]
   'dir:unwatch': [void, void]
 }
@@ -41,16 +41,11 @@ export interface ElectronAPI {
   cancelClose: () => Promise<void>
   openExternal: (url: string) => void
   readDirTree: (dirPath: string) => Promise<ReadDirTreeResult>
-  openFolderDialog: () => Promise<{ canceled: boolean; filePaths: string[] }>
+  openFolderDialog: () => Promise<string | null>
   watchDir: (dirPath: string) => Promise<void>
   unwatchDir: () => Promise<void>
   onFileOpenInTab: (callback: (data: { filePath: string; content: string }) => void) => Unsubscribe
-  onMenuSave: (callback: () => void) => Unsubscribe
-  onMenuSaveAs: (callback: () => void) => Unsubscribe
-  onViewModeChange: (callback: (mode: string) => void) => Unsubscribe
   onExternalModification: (callback: (filePath: string) => void) => Unsubscribe
   onDirChanged: (callback: () => void) => Unsubscribe
   onConfirmClose: (callback: () => void) => Unsubscribe
 }
-
-

src/shared/constants.ts

@@ -1,5 +1,5 @@
 // 共享常量 — 主进程和渲染进程共用
-export const APP_VERSION = 'v0.3.8'
+export const APP_VERSION = 'v0.3.10'
 export const MAX_FILE_SIZE = 20 * 1024 * 1024 // 20MB
 export const ALLOWED_EXTENSIONS = ['.md', '.markdown', '.txt'] as const
 export const SKIP_DIRS = new Set([

src/shared/ipc-channels.ts

@@ -19,9 +19,6 @@ export const IPC_CHANNELS = {
   // 主进程 → 渲染进程 (send)
   FILE_OPEN_IN_TAB: 'file:openInTab',
   FILE_EXTERNALLY_MODIFIED: 'file:externallyModified',
-  MENU_SAVE: 'menu:save',
-  MENU_SAVE_AS: 'menu:saveAs',
-  MENU_VIEW_MODE: 'menu:viewMode',
   WINDOW_CONFIRM_CLOSE: 'window:confirmClose',
   SIDEBAR_DIR_CHANGED: 'sidebar:dirChanged'
 } as const