feat(watch): clôture lot #91 - fréquence cardiaque live, notifications de séance et finitions montre

Consolide le lot applicatif watch companion validé :
- télémétrie fréquence cardiaque live remontée montre -> téléphone
  (collecteur watch, adapter Wear Data Layer, persistance Drift,
  propagation aux écrans historique/programme/profil/exécution)
- notifications de séance en arrière-plan côté téléphone (service
  foreground de statut + passerelle applicative)
- finitions montre : chrono d'étape, score d'étape, retrait du bouton
  "lancer une séance", thème, icônes et polices watch_app

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

lib/application/app_bootstrap.dart

@@ -1,6 +1,7 @@
 import '../infrastructure/local/local.dart';
 import '../infrastructure/remote/remote.dart';
 import '../infrastructure/security/security.dart';
+import '../infrastructure/session_notification/session_notification.dart';
 import '../infrastructure/watch_bridge/watch_bridge.dart';
 import 'application.dart';
 
@@ -12,6 +13,7 @@ abstract interface class AppDependencies {
   WorkoutTemplateUseCases get workoutTemplateUseCases;
   ActiveWorkoutSessionUseCases get activeWorkoutSessionUseCases;
   ActiveExerciseStepUseCases get activeExerciseStepUseCases;
+  ActiveWorkoutSensorUseCases get activeWorkoutSensorUseCases;
   CloseWorkoutSessionUseCase get closeWorkoutSessionUseCase;
   WorkoutHistoryUseCases get workoutHistoryUseCases;
   ProgressionStatsUseCase get progressionStatsUseCase;
@@ -32,9 +34,11 @@ final class AppBootstrap implements AppDependencies {
     required this.workoutTemplateUseCases,
     required this.activeWorkoutSessionUseCases,
     required this.activeExerciseStepUseCases,
+    required this.activeWorkoutSensorUseCases,
     required this.watchCompanionProjectionUseCases,
     required this.watchCompanionCommandHandler,
     required this.watchWearDataLayerAdapter,
+    required this.sessionNotificationCoordinator,
     required this.closeWorkoutSessionUseCase,
     required this.workoutHistoryUseCases,
     required this.progressionStatsUseCase,
@@ -61,9 +65,12 @@ final class AppBootstrap implements AppDependencies {
   final ActiveWorkoutSessionUseCases activeWorkoutSessionUseCases;
   @override
   final ActiveExerciseStepUseCases activeExerciseStepUseCases;
+  @override
+  final ActiveWorkoutSensorUseCases activeWorkoutSensorUseCases;
   final WatchCompanionProjectionUseCases watchCompanionProjectionUseCases;
   final WatchCompanionCommandHandler watchCompanionCommandHandler;
   final WatchWearDataLayerAdapter watchWearDataLayerAdapter;
+  final SessionNotificationCoordinator sessionNotificationCoordinator;
   @override
   final CloseWorkoutSessionUseCase closeWorkoutSessionUseCase;
   @override
@@ -122,6 +129,10 @@ final class AppBootstrap implements AppDependencies {
       clock: clock,
       ids: ids,
       originDeviceId: originDeviceId,
+      activeSessionUseCases: activeWorkoutSessionUseCases,
+    );
+    final activeWorkoutSensorUseCases = ActiveWorkoutSensorUseCases(
+      clock: clock,
     );
     final watchCompanionProjectionUseCases = WatchCompanionProjectionUseCases(
       sessionRepository: activeSessionRepository,
@@ -135,12 +146,23 @@ final class AppBootstrap implements AppDependencies {
       stepUseCases: activeExerciseStepUseCases,
       projectionSource: watchCompanionProjectionUseCases,
     );
+    final workoutHistoryUseCases = WorkoutHistoryUseCases(
+      repository: historyRepository,
+      clock: clock,
+    );
     final watchWearDataLayerAdapter = WatchWearDataLayerAdapter(
       nativeChannel: const MethodChannelWatchBridgeNativeChannel(),
       commandIngress: watchCompanionCommandHandler,
       projectionSource: watchCompanionProjectionUseCases,
+      workoutHistoryUseCases: workoutHistoryUseCases,
+      activeWorkoutSensorUseCases: activeWorkoutSensorUseCases,
+    );
+    final sessionNotificationCoordinator = SessionNotificationCoordinator(
+      projections: watchCompanionProjectionUseCases.projections,
+      gateway: const MethodChannelSessionNotificationGateway(),
     );
     await watchWearDataLayerAdapter.start();
+    sessionNotificationCoordinator.start();
     await SeedStarterContentUseCase(
       seedStateRepository: starterSeedRepository,
       contentRepository: starterSeedRepository,
@@ -198,9 +220,11 @@ final class AppBootstrap implements AppDependencies {
       ),
       activeWorkoutSessionUseCases: activeWorkoutSessionUseCases,
       activeExerciseStepUseCases: activeExerciseStepUseCases,
+      activeWorkoutSensorUseCases: activeWorkoutSensorUseCases,
       watchCompanionProjectionUseCases: watchCompanionProjectionUseCases,
       watchCompanionCommandHandler: watchCompanionCommandHandler,
       watchWearDataLayerAdapter: watchWearDataLayerAdapter,
+      sessionNotificationCoordinator: sessionNotificationCoordinator,
       closeWorkoutSessionUseCase: CloseWorkoutSessionUseCase(
         sessionRepository: activeSessionRepository,
         historyRepository: historyRepository,
@@ -208,10 +232,7 @@ final class AppBootstrap implements AppDependencies {
         ids: ids,
         originDeviceId: originDeviceId,
       ),
-      workoutHistoryUseCases: WorkoutHistoryUseCases(
-        repository: historyRepository,
-        clock: clock,
-      ),
+      workoutHistoryUseCases: workoutHistoryUseCases,
       progressionStatsUseCase: ProgressionStatsUseCase(
         repository: progressionStatsRepository,
         clock: clock,
@@ -255,8 +276,10 @@ final class AppBootstrap implements AppDependencies {
   }
 
   Future<void> dispose() async {
+    await sessionNotificationCoordinator.dispose();
     await watchWearDataLayerAdapter.stop();
     await watchCompanionProjectionUseCases.dispose();
+    await activeWorkoutSensorUseCases.dispose();
     await database.close();
   }
 }