Add PWA support using vite-plugin-pwa

Integrated the vite-plugin-pwa to enable Progressive Web App functionality. Added service worker registration, manifest configuration, and necessary assets like icons and favicon. This enhances offline capabilities and user experience.

frontend/src/main.jsx

@@ -1,5 +1,7 @@
 import React from "react";
 import { createRoot } from "react-dom/client";
 import App from "./App.jsx";
+import { registerSW } from "virtual:pwa-register";
 
 createRoot(document.getElementById("root")).render(<App />);
+registerSW({ immediate: true });