chore: bump version to 0.3.8

Code audit fixes:
- CRITICAL: reorder Markdown pipeline (fixImages before sanitize)
- CRITICAL: fix path prefix separator check
- BLOCKING: remove duplicate useEffect in Editor
- BLOCKING: skip onChange when content unchanged
- BLOCKING: optimize Sidebar re-render with useMemo
- HIGH: cleanup FileWatcher polling intervals
- HIGH: improve validatePath segment check
- HIGH: fix isExternalUpdate race with counter
- HIGH: add will-navigate / setWindowOpenHandler
- HIGH: explicit strip in sanitize schema
- MEDIUM: random temp file suffix instead of Date.now()
- MEDIUM/LOW: add IndexedDB error boundaries
- LOW: support UTF-16 BOM detection

src/renderer/components/Editor/Editor.tsx

@@ -33,6 +33,10 @@ export const Editor = React.memo(function Editor({ darkMode }: EditorProps) {
     content: activeTab?.content ?? '',
     onChange: useCallback((value: string) => {
       if (!activeTabId) return
+      // B-02: 内容未变时跳过（例如纯选择变更触发的 markdownUpdated），
+      // 避免将文档误标记为已修改
+      const tab = useTabStore.getState().tabs.find(t => t.id === activeTabId)
+      if (tab?.content === value) return
       updateTabContent(activeTabId, value)
       setModified(activeTabId, true)
     }, [activeTabId, updateTabContent, setModified]),
@@ -83,20 +87,6 @@ export const Editor = React.memo(function Editor({ darkMode }: EditorProps) {
     return () => setEditorViewGetter(() => null)
   }, [getView])
 
-  // Save current tab state on unmount or tab switch
-  useEffect(() => {
-    return () => {
-      if (!activeTabId) return
-      updateTabScroll(activeTabId, {
-        scrollTop: getScrollTop(),
-        selectionStart: getSelection().from,
-        selectionEnd: getSelection().to
-      })
-    }
-    // stable refs: getScrollTop, getSelection (useCallback([])), updateTabScroll (zustand) - never change
-    // eslint-disable-next-line react-hooks/exhaustive-deps
-  }, [activeTabId])
-
   // Ctrl+B bold, Ctrl+I italic, Ctrl+F search, Ctrl+H replace
   useEffect(() => {
     const handleKeyDown = (e: KeyboardEvent) => {

src/renderer/components/Editor/useMilkdown.ts

@@ -88,6 +88,8 @@ export function useMilkdown({ content, onChange, darkMode }: UseMilkdownOptions)
   const onChangeRef = useRef(onChange)
   const isExternalUpdate = useRef(false)
   const initialContentRef = useRef(content)
+  // H-03: 请求计数器 — 每个 setContent 调用自增，仅抑制匹配的 markdownUpdated 事件
+  const setContentRequestId = useRef(0)
 
   // Keep onChangeRef fresh
   useEffect(() => {
@@ -110,7 +112,9 @@ export function useMilkdown({ content, onChange, darkMode }: UseMilkdownOptions)
         const lm = ctx.get(listenerCtx)
         lm.markdownUpdated((_ctx, markdown, prevMarkdown) => {
           if (markdown === prevMarkdown) return
-          if (!isExternalUpdate.current) {
+          // H-03: 只有未被外部更新抑制时才触发 onChange。
+          // 计数器匹配确保用户按键不会在 setContent 期间被丢弃。
+          if (setContentRequestId.current === 0 && !isExternalUpdate.current) {
             onChangeRef.current(markdown)
           }
         })
@@ -165,13 +169,19 @@ export function useMilkdown({ content, onChange, darkMode }: UseMilkdownOptions)
     const editor = editorRef.current
     if (!editor) return
 
+    // H-03: 递增请求 ID，这样只有本次 replaceAll 触发的 markdownUpdated 会被抑制
+    const requestId = ++setContentRequestId.current
     isExternalUpdate.current = true
     try {
       editor.action(milkdownReplaceAll(newContent))
     } catch {
       // replaceAll may fail if editor is not fully ready
     } finally {
-      isExternalUpdate.current = false
+      // 仅当没有新的 setContent 启动时才重置标志
+      if (setContentRequestId.current === requestId) {
+        setContentRequestId.current = 0
+        isExternalUpdate.current = false
+      }
     }
   }, [])
 

src/renderer/components/Sidebar/Sidebar.tsx

@@ -18,7 +18,9 @@ const norm = (p: string) => p.replace(/[/\\]+$/, '').replace(/\\/g, '/')
 export const Sidebar = React.memo(function Sidebar() {
   const tabs = useTabStore(s => s.tabs)
   const activeTabId = useTabStore(s => s.activeTabId)
-  const activeTab = useTabStore(s => s.getActiveTab())
+  // B-03: 用 activeTabId + tabs 推导 activeTab 而非 s.getActiveTab()，
+  // 后者每次返回新对象引用导致 Zustand 无条件重渲染
+  const activeTab = useMemo(() => tabs.find(t => t.id === activeTabId) ?? null, [tabs, activeTabId])
   const switchToTab = useTabStore(s => s.switchToTab)
   const createTab = useTabStore(s => s.createTab)
   const rootPath = useSidebarStore(s => s.rootPath)