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>

test/data/streak_test.dart

@@ -0,0 +1,74 @@
+import 'package:block_seasons/data/save_repository.dart';
+import 'package:block_seasons/data/streak.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+
+void main() {
+  TestWidgetsFlutterBinding.ensureInitialized();
+
+  group('advanceStreak', () {
+    test('first ever play starts the streak at 1', () {
+      final next = advanceStreak(StreakState.initial, DateTime(2026, 6, 11));
+      expect(next.current, 1);
+      expect(next.best, 1);
+      expect(next.lastYmd, '2026-06-11');
+    });
+
+    test('same-day repeat play changes nothing', () {
+      final day1 = advanceStreak(StreakState.initial, DateTime(2026, 6, 11));
+      final again = advanceStreak(day1, DateTime(2026, 6, 11, 23, 59));
+      expect(again.current, 1);
+      expect(again.best, 1);
+    });
+
+    test('consecutive days grow the streak and best follows', () {
+      var s = advanceStreak(StreakState.initial, DateTime(2026, 6, 11));
+      s = advanceStreak(s, DateTime(2026, 6, 12));
+      s = advanceStreak(s, DateTime(2026, 6, 13));
+      expect(s.current, 3);
+      expect(s.best, 3);
+    });
+
+    test('missing a day resets current but keeps best', () {
+      var s = advanceStreak(StreakState.initial, DateTime(2026, 6, 11));
+      s = advanceStreak(s, DateTime(2026, 6, 12));
+      s = advanceStreak(s, DateTime(2026, 6, 15));
+      expect(s.current, 1);
+      expect(s.best, 2);
+    });
+
+    test('month boundaries count as consecutive days', () {
+      var s = advanceStreak(StreakState.initial, DateTime(2026, 6, 30));
+      s = advanceStreak(s, DateTime(2026, 7, 1));
+      expect(s.current, 2);
+    });
+
+    test('milestone crossings are flagged once', () {
+      var s = StreakState(current: 2, best: 6, lastYmd: '2026-06-10');
+      final next = advanceStreak(s, DateTime(2026, 6, 11));
+      expect(next.current, 3);
+      expect(next.hitMilestone, 3);
+
+      s = StreakState(current: 3, best: 6, lastYmd: '2026-06-11');
+      final after = advanceStreak(s, DateTime(2026, 6, 12));
+      expect(after.hitMilestone, isNull, reason: '4 is not a milestone');
+    });
+  });
+
+  group('SaveRepository streak persistence', () {
+    test('round-trips streak state', () async {
+      SharedPreferences.setMockInitialValues({});
+      final prefs = await SharedPreferences.getInstance();
+      final repo = SaveRepository(prefs);
+      expect(repo.streak.current, 0);
+
+      await repo.saveStreak(
+        const StreakState(current: 5, best: 9, lastYmd: '2026-06-11'),
+      );
+      final reloaded = SaveRepository(prefs);
+      expect(reloaded.streak.current, 5);
+      expect(reloaded.streak.best, 9);
+      expect(reloaded.streak.lastYmd, '2026-06-11');
+    });
+  });
+}

test/state/streak_notifier_test.dart

@@ -0,0 +1,38 @@
+import 'package:block_seasons/data/save_repository.dart';
+import 'package:block_seasons/state/providers.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+
+void main() {
+  TestWidgetsFlutterBinding.ensureInitialized();
+
+  test('onStagePlayed advances, persists, and surfaces milestones', () async {
+    SharedPreferences.setMockInitialValues({});
+    final prefs = await SharedPreferences.getInstance();
+    final repo = SaveRepository(prefs);
+    final container = ProviderContainer(
+      overrides: [saveRepositoryProvider.overrideWithValue(repo)],
+    );
+    addTearDown(container.dispose);
+
+    final notifier = container.read(streakProvider.notifier);
+    expect(container.read(streakProvider).current, 0);
+
+    await notifier.onStagePlayed(DateTime(2026, 6, 11));
+    await notifier.onStagePlayed(DateTime(2026, 6, 12));
+    await notifier.onStagePlayed(DateTime(2026, 6, 13));
+
+    final state = container.read(streakProvider);
+    expect(state.current, 3);
+    expect(state.hitMilestone, 3);
+
+    // Persisted: a fresh repository over the same prefs sees the streak.
+    expect(SaveRepository(prefs).streak.current, 3);
+
+    // Same-day replays neither grow nor re-flag.
+    await notifier.onStagePlayed(DateTime(2026, 6, 13, 22));
+    expect(container.read(streakProvider).current, 3);
+    expect(container.read(streakProvider).hitMilestone, isNull);
+  });
+}

test/widget_test.dart

@@ -1,10 +1,21 @@
-import 'package:flutter_test/flutter_test.dart';
-
 import 'package:block_seasons/app.dart';
+import 'package:block_seasons/data/save_repository.dart';
+import 'package:block_seasons/state/providers.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:shared_preferences/shared_preferences.dart';
 
 void main() {
   testWidgets('home screen shows title and play button', (tester) async {
-    await tester.pumpWidget(const BlockSeasonsApp());
+    SharedPreferences.setMockInitialValues({});
+    final repo = SaveRepository(await SharedPreferences.getInstance());
+
+    await tester.pumpWidget(
+      ProviderScope(
+        overrides: [saveRepositoryProvider.overrideWithValue(repo)],
+        child: const BlockSeasonsApp(),
+      ),
+    );
     await tester.pumpAndSettle();
 
     expect(find.text('Block Seasons'), findsOneWidget);