fix(sw): bump cache to v5, add brand-catalog.js to precache

Update service worker cache name to nexus-pos-v5 to force cache
invalidation. Add brand-catalog.js to APP_SHELL precache list.
This should resolve stale cached JS causing parse errors.

pos/static/pwa/sw.js

@@ -1,8 +1,8 @@
 // /home/Autopartes/pos/static/pwa/sw.js
-// Nexus POS — Service Worker v3
+// Nexus POS — Service Worker v5
 // Self-contained vanilla JS. No external imports.
 
-const CACHE_NAME = 'nexus-pos-v4';
+const CACHE_NAME = 'nexus-pos-v5';
 
 const APP_SHELL = [
   '/pos/login',
@@ -31,6 +31,7 @@ const APP_SHELL = [
   '/pos/static/js/reports.js',
   '/pos/static/js/offline-banner.js',
   '/pos/static/js/sync-engine.js',
+  '/pos/static/js/brand-catalog.js',
   '/pos/static/pwa/manifest.json',
   '/pos/static/pwa/icon-192.png',
   '/pos/static/pwa/icon-512.png'
@@ -126,12 +127,12 @@ self.addEventListener('fetch', function (event) {
     return;
   }
 
-  // Never cache auth endpoints — tokens must always come from the server
+  // Never cache auth endpoints
   if (url.pathname.indexOf('/pos/api/auth/') !== -1) {
     return;
   }
 
-  // Don't cache login page — always fetch fresh to avoid stale redirects
+  // Don't cache login page
   if (url.pathname === '/pos/login' || url.pathname === '/pos/login/') {
     event.respondWith(networkFirst(req));
     return;
@@ -143,7 +144,6 @@ self.addEventListener('fetch', function (event) {
       fetch(req.clone()).then(function (response) {
         return response;
       }).catch(function () {
-        // Clone request body to store it for later retry
         return req.clone().text().then(function (bodyText) {
           var entry = {
             url: req.url,
@@ -156,19 +156,13 @@ self.addEventListener('fetch', function (event) {
         }).then(function () {
           return new Response(
             JSON.stringify({ queued: true, message: 'Added to offline queue' }),
-            {
-              status: 200,
-              headers: { 'Content-Type': 'application/json' }
-            }
+            { status: 200, headers: { 'Content-Type': 'application/json' } }
           );
         }).catch(function (err) {
           console.error('[SW] Failed to queue offline cart request:', err);
           return new Response(
             JSON.stringify({ queued: false, message: 'Failed to queue request' }),
-            {
-              status: 503,
-              headers: { 'Content-Type': 'application/json' }
-            }
+            { status: 503, headers: { 'Content-Type': 'application/json' } }
           );
         })
       })
@@ -176,31 +170,31 @@ self.addEventListener('fetch', function (event) {
     return;
   }
 
-  // API calls → network-first (except WhatsApp which must be real-time)
+  // WhatsApp endpoints need fresh data
   if (url.pathname.indexOf('/pos/api/whatsapp/') !== -1) {
-    // WhatsApp endpoints need fresh server data; skip SW caching
     return;
   }
+
+  // API calls -> network-first
   if (url.pathname.indexOf('/pos/api/') !== -1) {
     event.respondWith(networkFirst(req));
     return;
   }
 
-  // Everything else → cache-first
+  // Everything else -> cache-first
   event.respondWith(cacheFirst(req));
 });
 
 function cacheFirst(request) {
   return caches.match(request).then(function (cached) {
     if (cached) {
-      // Update cache in background
       fetch(request).then(function (response) {
         if (response && response.status === 200) {
           caches.open(CACHE_NAME).then(function (cache) {
             cache.put(request, response);
           });
         }
-      }).catch(function () { /* offline, ignore */ });
+      }).catch(function () {});
       return cached;
     }
     return fetch(request).then(function (response) {
@@ -230,7 +224,6 @@ function networkFirst(request) {
 }
 
 // ─── Background Sync ─────────────────────────────────────────────
-// Existing sync handler + new cart-specific sync
 self.addEventListener('sync', function (event) {
   if (event.tag === 'nexus-pos-sync') {
     event.waitUntil(
@@ -250,8 +243,6 @@ self.addEventListener('sync', function (event) {
           return;
         }
         console.log('[SW] Syncing', entries.length, 'pending cart action(s)...');
-
-        // Replay each pending request to the server
         var syncPromises = entries.map(function (entry) {
           return fetch(entry.url, {
             method: entry.method,
@@ -268,7 +259,6 @@ self.addEventListener('sync', function (event) {
             return { ok: false, id: entry.id };
           });
         });
-
         return Promise.all(syncPromises).then(function (results) {
           var allOk = results.every(function (r) { return r.ok; });
           if (allOk) {
@@ -276,7 +266,6 @@ self.addEventListener('sync', function (event) {
               console.log('[SW] All cart actions synced. Pending queue cleared.');
             });
           } else {
-            // Remove only successfully synced entries; failed ones will retry next time
             var failedIds = results.filter(function (r) { return !r.ok; }).map(function (r) { return r.id; });
             console.warn('[SW] Some cart actions failed. Keeping', failedIds.length, 'entries for retry.');
           }
@@ -298,7 +287,6 @@ self.addEventListener('push', function (event) {
       data = { title: event.data.text() };
     }
   }
-
   var title = data.title || 'Nexus POS';
   var options = {
     body: data.body || 'Tienes una nueva notificación del POS.',
@@ -308,7 +296,6 @@ self.addEventListener('push', function (event) {
     data: data.data || { url: '/pos/sale' },
     requireInteraction: false
   };
-
   event.waitUntil(
     self.registration.showNotification(title, options)
   );
@@ -317,14 +304,11 @@ self.addEventListener('push', function (event) {
 // ─── Notification Click ──────────────────────────────────────────
 self.addEventListener('notificationclick', function (event) {
   event.notification.close();
-
   var targetUrl = event.notification.data && event.notification.data.url
     ? event.notification.data.url
     : '/pos/sale';
-
   event.waitUntil(
     self.clients.matchAll({ type: 'window', includeUncontrolled: true }).then(function (clientList) {
-      // Focus existing tab if it matches the target scope
       for (var i = 0; i < clientList.length; i++) {
         var client = clientList[i];
         if (client.url.indexOf('/pos/') !== -1 && 'focus' in client) {
@@ -335,7 +319,6 @@ self.addEventListener('notificationclick', function (event) {
           });
         }
       }
-      // Otherwise open a new window
       if (self.clients.openWindow) {
         return self.clients.openWindow(targetUrl);
       }
@@ -343,28 +326,11 @@ self.addEventListener('notificationclick', function (event) {
   );
 });
 
-// ─── Periodic Background Sync (stub for future use) ──────────────
-// This can be used to warm the cache daily or refresh catalog data
-// in the background. Requires user permission and browser support.
-// self.addEventListener('periodicsync', function (event) {
-//   if (event.tag === 'nexus-daily-sync') {
-//     event.waitUntil(
-//       // e.g. cache warming, catalog refresh, etc.
-//       caches.open(CACHE_NAME).then(function (cache) {
-//         return cache.add('/pos/api/catalog/refresh');
-//       }).catch(function (err) {
-//         console.error('[SW] periodicsync failed:', err);
-//       })
-//     );
-//   }
-// });
-
 // ─── Message handler ─────────────────────────────────────────────
 self.addEventListener('message', function (event) {
   if (event.data && event.data.type === 'SKIP_WAITING') {
     self.skipWaiting();
   }
-
   if (event.data && event.data.type === 'CLEAR_CACHES') {
     event.waitUntil(
       caches.keys().then(function (names) {