connectivityProvider — StreamProvider<bool>; true when any connectivity
result is non-none. No Wi-Fi gate per operator decision.
cacheSettingsProvider — AsyncNotifier<CacheSettings> persisting
capBytes / prefetchWindow / cacheLikedTracks via flutter_secure_storage.
Defaults: 5 GB cap, 5-track prefetch, cache liked = on.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
