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>

test/presentation/home_screen_test.dart

@@ -102,6 +102,37 @@ void main() {
     );
   });
 
+  testWidgets('le bandeau de reprise masque une séance invalide', (
+    tester,
+  ) async {
+    final activeRepository = _FakeActiveSessionRepository()
+      ..session = ActiveWorkoutSession(
+        metadata: _metadata('session-1'),
+        sourceWorkoutTemplateId: 'template-1',
+        status: ActiveWorkoutStatus.paused,
+        startedAt: DateTime.utc(2026, 7, 17, 12),
+        pausedAt: DateTime.utc(2026, 7, 17, 12, 5),
+        lastPersistedAt: DateTime.utc(2026, 7, 17, 12, 5),
+        elapsedActiveMs: 300000,
+        currentProgramIndex: 0,
+        currentExerciseIndex: 0,
+        currentSetIndex: 0,
+        resolvedTemplateSnapshotJson: _emptySessionSnapshot(),
+      );
+
+    await tester.pumpWidget(
+      MaterialApp(
+        navigatorObservers: [homeRouteObserver],
+        home: HomeScreen(bootstrap: _FakeBootstrap(activeRepository)),
+      ),
+    );
+    await tester.pump();
+    await tester.pump();
+
+    expect(find.textContaining('Séance en cours'), findsNothing);
+    expect(tester.takeException(), isNull);
+  });
+
   testWidgets('le bandeau de reprise disparaît au retour après abandon', (
     tester,
   ) async {
@@ -196,6 +227,9 @@ final class _FakeBootstrap implements AppDependencies {
         ids: _FakeIds(),
         originDeviceId: 'device-1',
       ),
+      activeWorkoutSensorUseCases = ActiveWorkoutSensorUseCases(
+        clock: _FakeClock(DateTime.utc(2026, 7, 17, 12)),
+      ),
       closeWorkoutSessionUseCase = CloseWorkoutSessionUseCase(
         sessionRepository: activeRepository,
         historyRepository: _FakeWorkoutHistoryRepository(),
@@ -282,6 +316,9 @@ final class _FakeBootstrap implements AppDependencies {
   @override
   final ActiveExerciseStepUseCases activeExerciseStepUseCases;
 
+  @override
+  final ActiveWorkoutSensorUseCases activeWorkoutSensorUseCases;
+
   @override
   final CloseWorkoutSessionUseCase closeWorkoutSessionUseCase;
 
@@ -327,6 +364,20 @@ String _sessionSnapshot() {
   });
 }
 
+String _emptySessionSnapshot() {
+  return jsonEncode({
+    'name': 'Séance vide',
+    'programs': [
+      {
+        'id': 'template-program-1',
+        'programNameSnapshot': 'Programme vide',
+        'programSnapshotJson': jsonEncode({'exercises': const []}),
+      },
+    ],
+    'overrides': const [],
+  });
+}
+
 EntityMetadata _metadata(String id) {
   return EntityMetadata(
     id: id,
@@ -553,6 +604,16 @@ final class _FakeActiveSessionRepository implements ActiveSessionRepository {
     return null;
   }
 
+  @override
+  Future<ActiveManualScoreState?> findManualScoreState({
+    required String sessionId,
+    required int programIndex,
+    required int exerciseIndex,
+    required int setIndex,
+  }) async {
+    return null;
+  }
+
   @override
   Future<ActiveSetTimerState?> findSetTimerState({
     required String sessionId,
@@ -585,6 +646,13 @@ final class _FakeActiveSessionRepository implements ActiveSessionRepository {
     return scoreStopwatchStates;
   }
 
+  @override
+  Future<List<ActiveManualScoreState>> listManualScoreStates(
+    String sessionId,
+  ) async {
+    return const [];
+  }
+
   @override
   Future<List<ActiveSetTimerState>> listSetTimerStates(String sessionId) async {
     return setTimerStates;
@@ -624,6 +692,9 @@ final class _FakeActiveSessionRepository implements ActiveSessionRepository {
     scoreStopwatchStates.add(state);
   }
 
+  @override
+  Future<void> saveManualScoreState(ActiveManualScoreState state) async {}
+
   @override
   Future<void> saveSetTimerState(ActiveSetTimerState state) async {
     setTimerStates.add(state);
@@ -646,6 +717,15 @@ final class _FakeActiveSessionRepository implements ActiveSessionRepository {
     required DateTime deletedAt,
   }) async {}
 
+  @override
+  Future<void> deleteManualScoreState({
+    required String sessionId,
+    required int programIndex,
+    required int exerciseIndex,
+    required int setIndex,
+    required DateTime deletedAt,
+  }) async {}
+
   @override
   Future<void> saveSetResult(ActiveSetResult result) async {
     results.add(result);
@@ -808,6 +888,14 @@ final class _FakeWorkoutHistoryRepository implements WorkoutHistoryRepository {
   @override
   Future<void> save(WorkoutHistory history) async {}
 
+  @override
+  Future<void> patchHeartRateSummary({
+    required String historyId,
+    required double averageHeartRateBpm,
+    required int maxHeartRateBpm,
+    required DateTime patchedAt,
+  }) async {}
+
   @override
   Future<void> saveSetResult(WorkoutHistorySetResult result) async {}