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）

tests/editor-context-menu.test.tsx

@@ -0,0 +1,49 @@
+// 编辑区右键菜单：条目随模式/选区变化，点击回传动作并关闭。
+import { describe, it, expect, vi } from 'vitest'
+import { createRoot } from 'react-dom/client'
+import { act } from 'react-dom/test-utils'
+import EditorContextMenu from '../src/components/EditorContextMenu'
+
+async function renderMenu(props: Record<string, unknown> = {}) {
+  const container = document.createElement('div')
+  document.body.appendChild(container)
+  const root = createRoot(container)
+  const actions: string[] = []
+  let closed = 0
+  await act(async () => {
+    root.render(
+      <EditorContextMenu
+        x={10} y={10} hasSelection={false} sourceMode={false}
+        onAction={(a) => actions.push(a)}
+        onClose={() => { closed += 1 }}
+        {...props}
+      />,
+    )
+  })
+  return { container, root, actions, closedCount: () => closed }
+}
+
+const btn = (c: HTMLElement, text: string) => [...c.querySelectorAll('button')].find((b) => b.textContent === text)
+
+describe('编辑区右键菜单', () => {
+  it('无选区时剪切/复制禁用，点加粗回传 bold 并关闭', async () => {
+    const { container, root, actions, closedCount } = await renderMenu()
+    expect(btn(container, '剪切')?.disabled).toBe(true)
+    expect(btn(container, '复制')?.disabled).toBe(true)
+    expect(btn(container, '粘贴')?.disabled).toBe(false)
+    await act(async () => { btn(container, '加粗')?.dispatchEvent(new MouseEvent('click', { bubbles: true })) })
+    expect(actions).toEqual(['bold'])
+    expect(closedCount()).toBe(1)
+    await act(async () => { root.unmount() })
+    container.remove()
+  })
+
+  it('源码模式只出编辑命令与「即时渲染」', async () => {
+    const { container, root } = await renderMenu({ sourceMode: true, hasSelection: true })
+    expect(btn(container, '加粗')).toBeUndefined()
+    expect(btn(container, '即时渲染')).toBeTruthy()
+    expect(btn(container, '剪切')?.disabled).toBe(false)
+    await act(async () => { root.unmount() })
+    container.remove()
+  })
+})