perf(service worker): make use of ASSETS cache

packages/app/src/service-worker.ts

@@ -113,15 +113,15 @@ sw.addEventListener('fetch', (event) => {
   if (event.request.method !== 'GET') return;
 
   const respond = async () => {
-    // const url = new URL(event.request.url);
+    const url = new URL(event.request.url);
     const cache = await caches.open(CACHE);
 
     // `build`/`files` can always be served from the cache
-    // if (ASSETS.includes(url.pathname)) {
-    //   const response = await cache.match(url.pathname);
-    //   if (response === undefined) throw new Error('Cache miss in build or files');
-    //   return response;
-    // }
+    if (ASSETS.includes(url.pathname)) {
+      const response = await cache.match(url.pathname);
+      if (response === undefined) throw new Error('Cache miss in build or files');
+      return response;
+    }
 
     // for everything else, try the network first, but
     // fall back to the cache if we're offline