Add daily streak system and normalize bundle id to com.airkjw.blockseasons

Pure advanceStreak (1-day grace none, milestone flags at 3/7/14/30),
persisted in the save blob; StreakNotifier advances on every finished
attempt; home screen flame chip and milestone snackbar. Fix flutter
create's camelCased iOS bundle id and underscored Android application
id to the agreed lowercase form before any store registration.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

lib/ui/screens/game_screen.dart

@@ -113,12 +113,24 @@ class _GameScreenState extends ConsumerState<GameScreen> {
             .recordWin(stars: next.starsEarned, score: next.score);
       }
       if (next.phase == GamePhase.lost) audio.play(Sfx.lose);
+      if (next.phase == GamePhase.won || next.phase == GamePhase.lost) {
+        ref.read(streakProvider.notifier).onStagePlayed(DateTime.now());
+      }
     }
   }
 
   @override
   Widget build(BuildContext context) {
     ref.listen<GameViewState?>(gameSessionProvider, _onSessionChange);
+    ref.listen(streakProvider, (prev, next) {
+      final milestone = next.hitMilestone;
+      if (milestone != null && prev?.hitMilestone != milestone) {
+        final l10n = AppLocalizations.of(context)!;
+        ScaffoldMessenger.of(context).showSnackBar(
+          SnackBar(content: Text(l10n.streakMilestone(milestone))),
+        );
+      }
+    });
     final view = ref.watch(gameSessionProvider);
     if (view == null) {
       return const Scaffold(body: Center(child: CircularProgressIndicator()));