fix: resolve pre-cache 404s and implement Bunker v7 with SWR

src/components/UploadQueue.tsx

@@ -127,8 +127,10 @@ export default function UploadQueue() {
 
     useEffect(() => {
         const handleOnline = () => {
-            console.log('Online! Triggering background sync...');
-            syncQueue();
+            console.log('Online! Waiting 2s for network stability...');
+            setTimeout(() => {
+                syncQueue();
+            }, 2000);
         };
 
         window.addEventListener('online', handleOnline);