fix: Agent Folder state not cleared when creating a new project (eigent-ai#1485)

Co-authored-by: bytecii <994513625@qq.com>

Author: dev-miro26

src/components/Folder/index.tsx

@@ -404,9 +404,13 @@ export default function Folder({ data: _data }: { data?: Agent }) {
     });
   };
 
-  // Reset hasFetchedRemote when activeTaskId changes
+  // Reset state when activeTaskId changes (e.g., new project created)
   useEffect(() => {
     hasFetchedRemote.current = false;
+    setSelectedFile(null);
+    setFileTree({ name: 'root', path: '', children: [], isFolder: true });
+    setFileGroups([{ folder: 'Reports', files: [] }]);
+    setExpandedFolders(new Set());
   }, [chatStore?.activeTaskId]);
 
   useEffect(() => {
@@ -486,6 +490,8 @@ export default function Folder({ data: _data }: { data?: Agent }) {
       if (file && selectedFile?.path !== chatStoreSelectedFile?.path) {
         selectedFileChange(file as FileInfo, isShowSourceCode);
       }
+    } else if (!chatStoreSelectedFile && selectedFile) {
+      setSelectedFile(null);
     }
     // eslint-disable-next-line react-hooks/exhaustive-deps
   }, [selectedFilePath, fileGroups, isShowSourceCode, chatStore?.activeTaskId]);