Adding basic version for testing

sw.js

@@ -0,0 +1,30 @@
+const CACHE = 'status-poster-v1';
+const PRECACHE = ['.', 'index.html', 'manifest.json', 'sw.js', 'icon.svg'];
+
+self.addEventListener('install', e => {
+  e.waitUntil(
+    caches.open(CACHE)
+      .then(c => c.addAll(PRECACHE))
+      .then(() => self.skipWaiting())
+  );
+});
+
+self.addEventListener('activate', e => {
+  e.waitUntil(
+    caches.keys()
+      .then(keys => Promise.all(
+        keys.filter(k => k !== CACHE).map(k => caches.delete(k))
+      ))
+      .then(() => self.clients.claim())
+  );
+});
+
+self.addEventListener('fetch', e => {
+  // Never intercept API calls — always go to network
+  if (e.request.url.includes('api.omg.lol')) return;
+
+  e.respondWith(
+    caches.match(e.request)
+      .then(cached => cached || fetch(e.request))
+  );
+});