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/src/app.dart

@@ -13,6 +13,7 @@ import 'plans/views/plan_editor_view.dart';
 import 'player/views/player_view.dart';
 import 'player/views/summary_view.dart';
 import 'settings/settings_controller.dart';
+import 'settings/settings_view.dart';
 
 class ZenXerciseApp extends StatelessWidget {
   const ZenXerciseApp({super.key});
@@ -47,7 +48,11 @@ class ZenXerciseApp extends StatelessWidget {
           PlanEditorView.routeName => PlanEditorView(planId: settings.arguments! as String),
           ExercisePickerView.routeName => ExercisePickerView(planId: settings.arguments! as String),
           PlayerView.routeName => PlayerView(planId: settings.arguments! as String),
-          SummaryView.routeName => SummaryView(sessionId: settings.arguments! as String),
+          SummaryView.routeName => switch (settings.arguments) {
+            final SummaryArguments a => SummaryView(sessionId: a.sessionId, justFinished: a.justFinished),
+            final id => SummaryView(sessionId: id! as String),
+          },
+          SettingsView.routeName => const SettingsView(),
           _ => const HomeView(),
         },
       ),