feat: minimal pwa

public/app.js

@@ -31,8 +31,24 @@ document.addEventListener('DOMContentLoaded', () => {
     setupMobileAddLink();
     setupLayoutToggle();
     applyLayout(currentLayout);
+    registerServiceWorker();
 });
 
+// Register service worker for PWA
+function registerServiceWorker() {
+    if ('serviceWorker' in navigator) {
+        window.addEventListener('load', () => {
+            navigator.serviceWorker.register('/sw.js')
+                .then((registration) => {
+                    console.log('Service Worker registered successfully:', registration.scope);
+                })
+                .catch((error) => {
+                    console.log('Service Worker registration failed:', error);
+                });
+        });
+    }
+}
+
 // Event listeners
 function setupEventListeners() {
     linkForm.addEventListener('submit', handleAddLink);