feat: add PWA support with manifest and service worker

app/register-sw.tsx

@@ -0,0 +1,23 @@
+"use client";
+
+import { useEffect } from "react";
+
+export function RegisterSW() {
+  useEffect(() => {
+    if (typeof window === "undefined") return;
+    if (!("serviceWorker" in navigator)) return;
+
+    const register = async () => {
+      try {
+        const swUrl = "/sw.js";
+        await navigator.serviceWorker.register(swUrl);
+      } catch (error) {
+        console.error("Service worker registration failed", error);
+      }
+    };
+
+    register();
+  }, []);
+
+  return null;
+}