The service worker was intercepting iframe navigation to app paths
(/notices/, /kitchen/ etc.) and serving the portal's cached index.html
before the request reached nginx — causing the 🚧 EmbeddedFallback.
Only apply the fallback to portal routes; everything else goes to network.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
