fix(pwa): force service worker update v8 and auto-reload on fresh deploy

sw.js

@@ -1,4 +1,4 @@
-const CACHE_NAME = 'opal-ai-v5-cache';
+const CACHE_NAME = 'opal-ai-v8-cache';
 
 self.addEventListener('install', (e) => {
   self.skipWaiting();
@@ -15,6 +15,7 @@ self.addEventListener('activate', (e) => {
 });
 
 self.addEventListener('fetch', (e) => {
+  // Always fetch fresh network first, fallback to cache only if completely offline
   e.respondWith(
     fetch(e.request).catch(() => caches.match(e.request))
   );