refactor: clean up index.tsx by removing commented-out code

- Removed commented-out PostHogProvider and related code to streamline the index.tsx file.
- Ensured the StrictMode wrapper is correctly applied around the QueryClientProvider and application components for better performance and debugging.

Author: atyrode

src/frontend/index.tsx

@@ -1,34 +1,28 @@
 import React, { StrictMode } from "react";
 import { createRoot } from "react-dom/client";
+
 import { QueryClient, QueryClientProvider } from '@tanstack/react-query';
 import { ReactQueryDevtools } from '@tanstack/react-query-devtools';
 
-// import posthog from "./src/lib/posthog";
-// import { PostHogProvider } from 'posthog-js/react';
-
 import "@atyrode/excalidraw/index.css";
 import "./index.scss";
 
 import App from "./src/App";
 import AuthGate from "./src/AuthGate";
 
-
-// Create a client
 const queryClient = new QueryClient();
 
 async function initApp() {
   const rootElement = document.getElementById("root")!;
   const root = createRoot(rootElement);
   root.render(
-    // <StrictMode>
+    <StrictMode>
       <QueryClientProvider client={queryClient}>
-        {/* <PostHogProvider client={posthog}> */}
-            <AuthGate />
-            <App />
-        {/* </PostHogProvider> */}
+          <AuthGate />
+          <App />
         <ReactQueryDevtools initialIsOpen={false} />
       </QueryClientProvider>
-    // </StrictMode>,
+    </StrictMode>,
   );
 }