Improve authentication flow and navigation handling

- Replace never-resolving promise with rejection
- Remove unnecessary setTimeout in navigation

lightrag_webui/src/api/lightrag.ts

@@ -186,8 +186,9 @@ axiosInstance.interceptors.response.use(
         }
         // For other APIs, navigate to login page
         navigationService.navigateToLogin();
-        // Return a never-resolving promise to prevent further execution
-        return new Promise(() => {});
+
+        // return a reject Promise
+        return Promise.reject(new Error('Authentication required'));
       }
       throw new Error(
         `${error.response.status} ${error.response.statusText}\n${JSON.stringify(