fix: update import path for App component in main.tsx

feat: add error handling middleware in server.js

client/src/main.tsx

@@ -1,7 +1,7 @@
 import { StrictMode } from "react";
 import { createRoot } from "react-dom/client";
 import "./index.css";
-import App from "../other/App.tsx";
+import App from "../src/App.tsx";
 
 createRoot(document.getElementById("root")!).render(
   <StrictMode>