Stage 5: History, the shared daily Streak and Reminders

- Streak computed from all complete Sessions: Grace Hour (00:00-01:00
  counts for yesterday unless it is done), a Freeze per 7 Streak Days
  (max 2) spent automatically on a missed day (ADR 0006)
- Top bar flame (grey until today is done) opening a panel with current
  and longest Streak, Freezes and a month calendar; 'Day N of your
  streak' on a fresh summary
- History per Mode grouped by day, reopening each summary
- Two adjustable Reminders (19:00, 22:30) scheduled 14 days ahead with
  flutter_local_notifications, none on a done day; permission asked
  after the first complete Session or from Settings
- Settings: Reminders, the Player chime, exercise credits

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

test/support/test_app.dart

@@ -10,6 +10,7 @@ import 'package:zenxercise/src/history/session_repository.dart';
 import 'package:zenxercise/src/plans/plan_repository.dart';
 import 'package:zenxercise/src/player/player_effects.dart';
 import 'package:zenxercise/src/settings/settings_controller.dart';
+import 'package:zenxercise/src/streak/reminder_scheduler.dart';
 
 import 'test_database.dart';
 
@@ -62,6 +63,31 @@ class FakePlayerEffects implements PlayerEffects {
   Future<void> keepScreenOn(bool on) async => screenOn = on;
 }
 
+/// Records what would be scheduled instead of talking to Android.
+class FakeNotifier implements Notifier {
+  final scheduled = <(DateTime, String)>[];
+  var permissionRequests = 0;
+
+  @override
+  Future<void> init() async {}
+
+  @override
+  Future<bool> requestPermission() async {
+    permissionRequests++;
+    return true;
+  }
+
+  @override
+  Future<bool> enabled() async => true;
+
+  @override
+  Future<void> cancelAll() async => scheduled.clear();
+
+  @override
+  Future<void> schedule({required int id, required DateTime at, required String title, required String body}) async =>
+      scheduled.add((at, body));
+}
+
 /// A Pixel-sized screen instead of the default 800×600, so the floating
 /// navigation bar does not cover what a test taps.
 void usePhoneScreen(WidgetTester tester) {
@@ -78,20 +104,25 @@ Future<SettingsController> pumpApp(
   PlanRepository? plans,
   SessionRepository? sessions,
   PlayerEffects? effects,
+  FakeNotifier? notifier,
 }) async {
   SharedPreferences.setMockInitialValues(prefs);
   final settings = SettingsController(SettingsService());
   await settings.loadSettings();
   final db = testDatabase();
   addTearDown(db.close);
+  final sessionRepository = sessions ?? SessionRepository(db);
+  final fakeNotifier = notifier ?? FakeNotifier();
   await tester.pumpWidget(
     MultiProvider(
       providers: [
         ChangeNotifierProvider.value(value: settings),
         Provider.value(value: library ?? sampleLibrary),
         Provider.value(value: plans ?? PlanRepository(db)),
-        Provider.value(value: sessions ?? SessionRepository(db)),
+        Provider.value(value: sessionRepository),
         Provider<PlayerEffects>.value(value: effects ?? FakePlayerEffects()),
+        Provider<Notifier>.value(value: fakeNotifier),
+        Provider.value(value: ReminderScheduler(fakeNotifier, settings, sessionRepository)),
       ],
       child: const ZenXerciseApp(),
     ),