fix: 侧边栏watcher泄漏、目录刷新防抖、清理过时注释

main.js

@@ -111,6 +111,7 @@ function createWindow() {
 
   mainWindow.on('closed', () => {
     stopWatching();
+    stopSidebarWatching();
     mainWindow = null;
   });
 }

renderer/renderer.js

@@ -1263,8 +1263,11 @@
 
     btnOpenFolder.addEventListener('click', openFolder);
     if (typeof window.electronAPI !== 'undefined') {
+      let dirRefreshTimer = null;
       window.electronAPI.onDirChanged(() => {
-        if (currentRootPath) refreshTree();
+        if (!currentRootPath) return;
+        if (dirRefreshTimer) clearTimeout(dirRefreshTimer);
+        dirRefreshTimer = setTimeout(() => refreshTree(), 300);
       });
     }
   }
@@ -1275,7 +1278,6 @@
   }
 
   async function openFolderDialog() {
-    // We'll add a dir:openDialog IPC
     if (typeof window.electronAPI !== 'undefined' && window.electronAPI.openFolderDialog) {
       const result = await window.electronAPI.openFolderDialog();
       if (result) {