feat(menus): 编辑区自绘右键菜单 + 全局屏蔽 WebView 自带菜单（docs/26，含 docs/21 勘误）

src/App.tsx

@@ -9,6 +9,7 @@ import StatusBar from './components/StatusBar'
 import EditorPane from './components/EditorPane'
 import type { SourceEditorApi } from './components/SourceEditor'
 import FindBar from './components/FindBar'
+import EditorContextMenu, { type EditorMenuAction } from './components/EditorContextMenu'
 import type { EditorPaneApi } from './components/EditorPane'
 import type { FindOptions } from './editor/search'
 import { comboFromEvent, resolveShortcuts } from './utils/shortcuts'
@@ -912,6 +913,54 @@ export default function App() {
     return () => document.removeEventListener('keydown', onKey)
   }, [tab, newDoc, openFile, saveTab, closeTab, withEditor, ui.shortcuts, openFind, closeFind])
 
+  // 屏蔽 WebView 自带右键菜单：编辑区/标题栏等处右键不再冒出浏览器菜单；
+  // 输入框保留系统菜单（拼写检查、粘贴等在输入框里是刚需）。
+  // 应用自绘菜单（标签/文件树/编辑区）走各自的 contextmenu 处理，不受影响
+  // （React 处理在冒泡链上先于 document 监听执行）。
+  useEffect(() => {
+    const onContextMenu = (e: MouseEvent) => {
+      if ((e.target as HTMLElement | null)?.closest('input, textarea')) return
+      e.preventDefault()
+    }
+    document.addEventListener('contextmenu', onContextMenu)
+    return () => document.removeEventListener('contextmenu', onContextMenu)
+  }, [])
+
+  // ——— 编辑区自绘右键菜单 ———
+  const [editorMenu, setEditorMenu] = useState<{ x: number; y: number; hasSelection: boolean } | null>(null)
+  const openEditorMenu = (e: React.MouseEvent) => {
+    const target = e.target as HTMLElement
+    const inEditor = sourceMode
+      ? Boolean(target.closest('.source-cm'))
+      : Boolean(target.closest('.ProseMirror'))
+    if (!inEditor) return
+    e.preventDefault()
+    let hasSelection = false
+    if (sourceMode) {
+      hasSelection = sourceApiRef.current?.hasSelection() ?? false
+    } else if (tab) {
+      const editor = paneApisRef.current.get(tab.id)?.editor
+      if (editor) {
+        try { hasSelection = editor.action((ctx) => !ctx.get(editorViewCtx).state.selection.empty) } catch { hasSelection = false }
+      }
+    }
+    setEditorMenu({ x: e.clientX, y: e.clientY, hasSelection })
+  }
+  const runEditorMenuAction = (action: EditorMenuAction) => {
+    switch (action) {
+      case 'cut': document.execCommand('cut'); break
+      case 'copy': document.execCommand('copy'); break
+      case 'paste': void pasteFromClipboard(); break
+      case 'selectAll': document.execCommand('selectAll'); break
+      case 'bold': withEditor(editorCommands.bold); break
+      case 'italic': withEditor(editorCommands.italic); break
+      case 'strikethrough': withEditor(editorCommands.strikethrough); break
+      case 'inlineCode': withEditor(editorCommands.inlineCode); break
+      case 'link': setModal('link'); break
+      case 'toggleSource': toggleSourceMode(); break
+    }
+  }
+
   const pasteFromClipboard = useCallback(async () => {
     if (sourceMode) {
       // 源码模式下 CodeMirror 自带粘贴处理，聚焦后由浏览器原生粘贴完成
@@ -1360,7 +1409,7 @@ export default function App() {
           onExportTab={exportTabById}
           onPrintTab={printTabById}
         />
-        <div className="editor-area" style={{ ['--doc-zoom' as string]: zoom }}>
+        <div className="editor-area" style={{ ['--doc-zoom' as string]: zoom }} onContextMenu={openEditorMenu}>
           {!tab && (
             <div className="empty-state">
               <h2>没有打开的文档</h2>
@@ -1533,6 +1582,16 @@ export default function App() {
         />
       )}
       {notice && <div className="app-notice">{notice}</div>}
+      {editorMenu && tab && (
+        <EditorContextMenu
+          x={editorMenu.x}
+          y={editorMenu.y}
+          hasSelection={editorMenu.hasSelection}
+          sourceMode={sourceMode}
+          onAction={runEditorMenuAction}
+          onClose={() => setEditorMenu(null)}
+        />
+      )}
       {recoveryOffer.length > 0 && !recoveryDismissed && (
         <RecoveryModal
           items={recoveryOffer}

src/components/EditorContextMenu.tsx

@@ -0,0 +1,59 @@
+import { useRef } from 'react'
+import { useDismiss } from '../hooks/useDismiss'
+
+export type EditorMenuAction =
+  | 'cut' | 'copy' | 'paste' | 'selectAll'
+  | 'bold' | 'italic' | 'strikethrough' | 'inlineCode' | 'link'
+  | 'toggleSource'
+
+interface Props {
+  x: number
+  y: number
+  /** 当前是否有选区（决定剪切/复制是否可用） */
+  hasSelection: boolean
+  sourceMode: boolean
+  onAction: (action: EditorMenuAction) => void
+  onClose: () => void
+}
+
+/**
+ * 编辑区自绘右键菜单（替代 WebView 自带菜单）：编辑命令与顶部「编辑/格式」
+ * 菜单同一套实现。容器 mousedown 阻止默认行为，让焦点与选区留在编辑器里，
+ * execCommand 类命令才作用得准。
+ */
+export default function EditorContextMenu({ x, y, hasSelection, sourceMode, onAction, onClose }: Props) {
+  const ref = useRef<HTMLDivElement>(null)
+  useDismiss(ref, true, onClose)
+  const act = (a: EditorMenuAction) => { onClose(); onAction(a) }
+  // 位置夹取，避免菜单溢出窗口右/下边（尺寸为估算值：宽约 190，高随模式）
+  const left = Math.max(4, Math.min(x, window.innerWidth - 196))
+  const estHeight = sourceMode ? 236 : 388
+  const top = Math.max(4, Math.min(y, window.innerHeight - estHeight - 8))
+  return (
+    <div
+      className="tree-context-menu editor-context-menu"
+      ref={ref}
+      style={{ left, top }}
+      onClick={(e) => e.stopPropagation()}
+      onMouseDown={(e) => e.preventDefault()}
+      onContextMenu={(e) => e.preventDefault()}
+    >
+      <button disabled={!hasSelection} onClick={() => act('cut')}>剪切</button>
+      <button disabled={!hasSelection} onClick={() => act('copy')}>复制</button>
+      <button onClick={() => act('paste')}>粘贴</button>
+      <button onClick={() => act('selectAll')}>全选</button>
+      {!sourceMode && (
+        <>
+          <div className="tree-menu-divider" />
+          <button onClick={() => act('bold')}>加粗</button>
+          <button onClick={() => act('italic')}>斜体</button>
+          <button onClick={() => act('strikethrough')}>删除线</button>
+          <button onClick={() => act('inlineCode')}>行内代码</button>
+          <button onClick={() => act('link')}>超链接…</button>
+        </>
+      )}
+      <div className="tree-menu-divider" />
+      <button onClick={() => act('toggleSource')}>{sourceMode ? '即时渲染' : '源码模式'}</button>
+    </div>
+  )
+}

src/components/SourceEditor.tsx

@@ -13,6 +13,7 @@ export interface SourceEditorApi {
   jumpToLine: (line: number) => void
   getAnchor: () => CursorAnchor | null
   focus: () => void
+  hasSelection: () => boolean
   findAll: (query: string, opts: FindOptions) => number
   gotoMatch: (index: number) => number
   replaceCurrent: (replacement: string) => boolean
@@ -154,6 +155,7 @@ export default function SourceEditor({ tabId, initialText, initialCursorOffset,
       },
       getAnchor: () => anchorFromMarkdown(view.state.doc.toString(), view.state.selection.main.head),
       focus: () => view.focus(),
+      hasSelection: () => !view.state.selection.main.empty,
       findAll,
       gotoMatch,
       replaceCurrent: (replacement) => {

src/styles.css

@@ -216,6 +216,8 @@ kbd { background: var(--code-bg); border: 1px solid var(--border); border-radius
 .tree-context-menu button { display: block; width: 100%; text-align: left; border: 0; background: transparent; padding: 6px 10px; border-radius: 6px; cursor: pointer; font-size: 13px; }
 .tree-context-menu button:hover { background: var(--accent-weak); }
 .tree-context-menu button.danger { color: #b3261e; }
+.editor-context-menu button:disabled { opacity: 0.45; cursor: default; }
+.editor-context-menu button:disabled:hover { background: transparent; }
 
 /* ——— 阶段 5：文档主题（变量层，[data-doc-theme] 挂在 html 上） ——— */
 :root {