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>

lib/main.dart

@@ -10,6 +10,7 @@ import 'src/history/session_repository.dart';
 import 'src/plans/plan_repository.dart';
 import 'src/player/player_effects.dart';
 import 'src/settings/settings_controller.dart';
+import 'src/streak/reminder_scheduler.dart';
 
 void main() async {
   WidgetsFlutterBinding.ensureInitialized();
@@ -19,6 +20,12 @@ void main() async {
   final library = await ExerciseLibrary.load(rootBundle);
   final settings = SettingsController(SettingsService());
   await settings.loadSettings();
+  final sessions = SessionRepository(db);
+  final notifier = LocalNotifier();
+  await notifier.init();
+  final reminders = ReminderScheduler(notifier, settings, sessions);
+  // Today may have been finished, or a day may have passed, since the last run.
+  reminders.sync();
 
   runApp(
     MultiProvider(
@@ -26,7 +33,9 @@ void main() async {
         ChangeNotifierProvider.value(value: settings),
         Provider.value(value: library),
         Provider.value(value: PlanRepository(db)),
-        Provider.value(value: SessionRepository(db)),
+        Provider.value(value: sessions),
+        Provider<Notifier>.value(value: notifier),
+        Provider.value(value: reminders),
         Provider<PlayerEffects>(create: (_) => DevicePlayerEffects()),
       ],
       child: const ZenXerciseApp(),