fix: add .catch() to SW activate event

sw.js

@@ -14,7 +14,7 @@ self.addEventListener('activate', event => {
             Promise.all(
                 keys.filter(k => k !== CACHE_NAME).map(k => caches.delete(k))
             )
-        )
+        ).catch(err => console.warn('[SW] activate error', err))
     );
     self.clients.claim();
 });