feat: 阶段1-3 桌面编辑器（Tauri 骨架/编辑核心深化/复杂内容）

tests/sourceEditor.test.tsx

@@ -0,0 +1,40 @@
+// 源码模式（CodeMirror 6）冒烟：能挂载、锚点 API 可用、改动经 onChange 回传。
+import { describe, it, expect, afterEach } from 'vitest'
+import { createRoot, type Root } from 'react-dom/client'
+import { act } from 'react-dom/test-utils'
+import SourceEditor, { type SourceEditorApi } from '../src/components/SourceEditor'
+
+let root: Root | null = null
+afterEach(() => {
+  act(() => root?.unmount())
+  root = null
+  document.body.innerHTML = ''
+})
+
+describe('SourceEditor', () => {
+  it('挂载 CodeMirror 并提供锚点/跳行 API', async () => {
+    const md = '# 标题\n\n正文段落。\n'
+    let api: SourceEditorApi | null = null
+    const changes: string[] = []
+    const container = document.createElement('div')
+    document.body.appendChild(container)
+    root = createRoot(container)
+    await act(async () => {
+      root!.render(
+        <SourceEditor
+          tabId="t1"
+          initialText={md}
+          initialCursorOffset={md.indexOf('正文')}
+          dark={false}
+          onChange={(t) => changes.push(t)}
+          onReady={(a) => { api = a }}
+        />,
+      )
+    })
+    expect(container.querySelector('.cm-editor')).not.toBeNull()
+    expect(api).not.toBeNull()
+    expect(api!.getAnchor()).toEqual({ blockText: '正文段落。', offsetInBlock: 0 })
+    act(() => api!.jumpToLine(0))
+    expect(api!.getAnchor()?.blockText).toBe('标题')
+  })
+})