feat(state): DailyRewardNotifier with injectable clock

lib/state/providers.dart

@@ -3,6 +3,7 @@ import 'package:flutter_riverpod/flutter_riverpod.dart';
 import '../data/content_repository.dart';
 import '../data/save_repository.dart';
 import '../data/streak.dart';
+import '../game/daily/daily_reward.dart';
 import '../game/models/booster.dart';
 import '../game/models/season.dart';
 import '../services/ad_service.dart';
@@ -15,6 +16,7 @@ import '../services/review_service.dart';
 import '../services/store_reviewer.dart';
 import 'ads_notifier.dart';
 import 'booster_inventory_notifier.dart';
+import 'daily_reward_notifier.dart';
 import 'endless_best_notifier.dart';
 import 'music_notifier.dart';
 import 'sound_notifier.dart';
@@ -150,3 +152,11 @@ final boosterInventoryProvider =
     NotifierProvider<BoosterInventoryNotifier, Map<BoosterType, int>>(
   BoosterInventoryNotifier.new,
 );
+
+/// Injectable clock for the daily calendar (overridden in tests).
+final dailyNowProvider = Provider<DateTime Function()>((ref) => DateTime.now);
+
+final dailyRewardProvider =
+    NotifierProvider<DailyRewardNotifier, DailyResolution>(
+  DailyRewardNotifier.new,
+);