add pwa

src/components/ServiceWorkerRegister.tsx

@@ -0,0 +1,20 @@
+"use client";
+
+import { useEffect } from "react";
+
+export default function ServiceWorkerRegister() {
+    useEffect(() => {
+        if ("serviceWorker" in navigator) {
+            navigator.serviceWorker
+                .register("/sw.js")
+                .then((registration) => {
+                    console.log("✅ SW registered:", registration.scope);
+                })
+                .catch((error) => {
+                    console.error("❌ SW registration failed:", error);
+                });
+        }
+    }, []);
+
+    return null;
+}