Refactor code structure and remove redundant changes

src-old/main.tsx

@@ -0,0 +1,16 @@
+import React from "react";
+import { createRoot } from "react-dom/client";
+import { HelmetProvider } from "react-helmet-async";
+import App from "./App.tsx";
+import "./index.css";
+import { ThemeProvider } from "@/components/theme/ThemeProvider";
+
+createRoot(document.getElementById("root")!).render(
+  <React.StrictMode>
+    <HelmetProvider>
+      <ThemeProvider defaultTheme="dark" storageKey="thrillwiki-theme">
+        <App />
+      </ThemeProvider>
+    </HelmetProvider>
+  </React.StrictMode>
+);