improve page-create, service-worker and manifest

service-worker.js

@@ -1,4 +1,4 @@
-const CACHE_NAME = 'dgray-v19';
+const CACHE_NAME = 'dgray-v20';
 const STATIC_ASSETS = [
     '/',
     '/index.html',
@@ -10,6 +10,12 @@ const STATIC_ASSETS = [
     '/js/router.js',
     '/js/i18n.js',
     '/js/services/api.js',
+    '/js/services/crypto.js',
+    '/js/services/chat.js',
+    '/js/data/mock-listings.js',
+    '/js/components/chat-widget.js',
+    '/js/components/listing-card.js',
+    '/js/components/search-box.js',
     '/locales/de.json',
     '/locales/en.json',
     '/locales/fr.json',
@@ -46,14 +52,24 @@ self.addEventListener('activate', (event) => {
 
 self.addEventListener('fetch', (event) => {
     const { request } = event;
+    const url = new URL(request.url);
     
     if (request.method !== 'GET') return;
     
-    if (request.url.includes('/api/')) {
+    // API calls: Network First
+    if (url.pathname.includes('/api/')) {
         event.respondWith(networkFirst(request));
-    } else {
-        event.respondWith(cacheFirst(request));
+        return;
     }
+    
+    // HTML and JS: Stale-While-Revalidate (show cached, update in background)
+    if (url.pathname.endsWith('.html') || url.pathname.endsWith('.js') || url.pathname === '/') {
+        event.respondWith(staleWhileRevalidate(request));
+        return;
+    }
+    
+    // Everything else: Cache First
+    event.respondWith(cacheFirst(request));
 });
 
 async function cacheFirst(request) {
@@ -89,3 +105,17 @@ async function networkFirst(request) {
         });
     }
 }
+
+async function staleWhileRevalidate(request) {
+    const cache = await caches.open(CACHE_NAME);
+    const cached = await cache.match(request);
+    
+    const fetchPromise = fetch(request).then((response) => {
+        if (response.ok) {
+            cache.put(request, response.clone());
+        }
+        return response;
+    }).catch(() => cached);
+    
+    return cached || fetchPromise;
+}