v0.3.6: 修复文档大纲导航Bug + 新增自动保存功能

Bug修复:
  - 文档大纲点击标题未定位到编辑器内容 (P0)
  - 根因: raw markdown字符偏移 ≠ ProseMirror文档位置
  - 改为通过 view.state.doc.descendants() 遍历节点树,
    按 heading类型名 + level + textContent 三重匹配定位

新增功能:
  - 自动保存 (2秒防抖), 仅对文件标签页生效
  - 状态栏显示 自动/保存中... 指示器

版本同步: package.json / AboutDialog / README 均更新至 v0.3.6

src/renderer/components/Sidebar/Sidebar.tsx

@@ -9,6 +9,7 @@ import { useSidebarResize } from '../../hooks/useSidebarResize'
 import { useFolderOperations } from '../../hooks/useFolderOperations'
 import { useAutoExpandDir } from '../../hooks/useAutoExpandDir'
 import { OutlinePanel, parseHeadings } from '../OutlinePanel'
+import type { Heading } from '../OutlinePanel'
 import { getEditorView, useEditorStore } from '../../stores/editorStore'
 import { TextSelection } from '@milkdown/prose/state'
 
@@ -38,14 +39,33 @@ export const Sidebar = React.memo(function Sidebar() {
     return parseHeadings(activeTab.content)
   }, [activeTab?.content])
 
-  // Navigate to heading position in editor
-  const handleHeadingNavigate = useCallback((pos: number) => {
+  // Navigate to heading in ProseMirror document tree
+  const handleHeadingNavigate = useCallback((heading: Heading, index: number) => {
     const view = getEditorView()
     if (!view) return
     try {
-      const tr = view.state.tr.setSelection(
-        TextSelection.create(view.state.doc, pos, pos)
-      )
+      let foundPos: number | null = null
+      let currentIndex = 0
+
+      view.state.doc.descendants((node, pos) => {
+        if (foundPos !== null) return false
+        if (node.type.name === 'heading' && node.attrs.level === heading.level) {
+          if (node.textContent.trim() === heading.text) {
+            if (currentIndex === index) {
+              foundPos = pos
+              return false
+            }
+            currentIndex++
+          }
+        }
+        return true
+      })
+
+      if (foundPos === null) return
+
+      const tr = view.state.tr
+        .setSelection(TextSelection.create(view.state.doc, foundPos, foundPos))
+        .scrollIntoView()
       view.dispatch(tr)
       view.focus()
     } catch {