feat: Phase 5.3 - PWA Offline Support with Workbox

- Add vite-plugin-pwa + workbox-window
- Configure PWA manifest with icons (SVG)
- Configure Workbox runtime caching:
  - API routes: NetworkFirst (10s timeout, 100 entries, 24h)
  - Media files: CacheFirst (50 entries, 7 days)
  - Pages: NetworkFirst (10s timeout, 50 entries, 24h)
- Register service worker in app.js with update notification
- Generate icons (SVG) for all sizes

Tests: 101 passing (319 assertions)

resources/js/app.js

@@ -14,6 +14,31 @@ window.Echo = new Echo({
     enabledTransports: ['ws', 'wss'],
 });
 
+// Register service worker for PWA
+if ('serviceWorker' in navigator) {
+    window.addEventListener('load', () => {
+        navigator.serviceWorker.register('/sw.js')
+            .then(registration => {
+                console.log('SW registered:', registration.scope);
+
+                registration.addEventListener('updatefound', () => {
+                    const newWorker = registration.installing;
+                    newWorker.addEventListener('statechange', () => {
+                        if (newWorker.state === 'installed' && navigator.serviceWorker.controller) {
+                            console.log('New version available!');
+                            if (confirm('Hay una nueva versión disponible. ¿Recargar?')) {
+                                window.location.reload();
+                            }
+                        }
+                    });
+                });
+            })
+            .catch(error => {
+                console.log('SW registration failed:', error);
+            });
+    });
+}
+
 import localforage from 'localforage';
 
 // Generic function to queue any offline action