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/progression_screen_test.dart

@@ -456,6 +456,14 @@ 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 {}
 
@@ -539,6 +547,14 @@ final class _FakeActiveSessionRepository implements ActiveSessionRepository {
     required int setIndex,
   }) async => null;
 
+  @override
+  Future<ActiveManualScoreState?> findManualScoreState({
+    required String sessionId,
+    required int programIndex,
+    required int exerciseIndex,
+    required int setIndex,
+  }) async => null;
+
   @override
   Future<ActiveSetTimerState?> findSetTimerState({
     required String sessionId,
@@ -567,6 +583,11 @@ final class _FakeActiveSessionRepository implements ActiveSessionRepository {
     String sessionId,
   ) async => const [];
 
+  @override
+  Future<List<ActiveManualScoreState>> listManualScoreStates(
+    String sessionId,
+  ) async => const [];
+
   @override
   Future<List<ActiveSetResult>> listSetResults(String sessionId) async {
     return const [];
@@ -594,9 +615,21 @@ final class _FakeActiveSessionRepository implements ActiveSessionRepository {
   @override
   Future<void> saveScoreStopwatchState(ActiveScoreStopwatchState state) async {}
 
+  @override
+  Future<void> saveManualScoreState(ActiveManualScoreState state) async {}
+
   @override
   Future<void> saveSetResult(ActiveSetResult result) async {}
 
   @override
   Future<void> saveSetTimerState(ActiveSetTimerState state) async {}
+
+  @override
+  Future<void> deleteManualScoreState({
+    required String sessionId,
+    required int programIndex,
+    required int exerciseIndex,
+    required int setIndex,
+    required DateTime deletedAt,
+  }) async {}
 }