subscribePush() swallowed all errors, so if pushManager.subscribe() failed
(e.g. called before the service worker was active) nobody ever subscribed and
there was no trace. Now: await serviceWorker.ready before subscribing, and
console.log/warn each step so the real failure is visible. Server send path
verified independently (web-push builds valid VAPID requests).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
SravanandClaude Opus 4.8
f7ddb2e7ae