On a cold start the consent flow is still running when home first builds, so
createBanner returns null and the slot stayed empty until a rebuild. AdService
now exposes an isReady ValueNotifier; BannerAdSlot listens and retries its load
once MobileAds finishes initializing. Verified: analyze clean, 169 tests green.
Adds firebase_core + firebase_analytics and a FirebaseAnalyticsBackend that
adapts the existing AnalyticsBackend interface to GA4. Kept in its own file
so the typed AnalyticsService and DebugAnalyticsBackend stay free of the
firebase dependency (unit tests never pull in platform channels).
Not yet wired into main() — that needs lib/firebase_options.dart from
flutterfire configure (owner step). All 161 tests still green.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Pure-Dart WAV synthesizer (tool/gen_sfx.dart) generates place/clear/
combo/win/lose effects; AudioService player pool fires on placement,
line clears, combo streaks, and phase transitions.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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