feat: offline content

lib/push.ts

@@ -110,11 +110,14 @@ export async function enablePush(): Promise<void> {
     throw new Error("Notification permission was not granted.");
   }
 
-  // The BFF origin rides along as a query param so the service worker can
-  // re-register rotated subscriptions (pushsubscriptionchange) on its own.
-  const reg = await navigator.serviceWorker.register(
-    `/sw.js?bff=${encodeURIComponent(BFF_BASE)}`,
-  );
+  // The service worker is registered app-wide by ServiceWorkerRegistrar (with
+  // the same `?bff=` query, so there's a single registration/scope). Reuse it;
+  // only register here as a fallback if it somehow isn't present yet.
+  const reg =
+    (await navigator.serviceWorker.getRegistration()) ??
+    (await navigator.serviceWorker.register(
+      `/sw.js?bff=${encodeURIComponent(BFF_BASE)}`,
+    ));
   await navigator.serviceWorker.ready;
 
   let sub = await reg.pushManager.getSubscription();