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/ports.dart

@@ -485,6 +485,7 @@ enum RemoteAuthFailure {
   invalidCredentials,
   emailAlreadyUsed,
   network,
+  server,
   unknown,
 }
 
@@ -857,6 +858,7 @@ abstract interface class ActiveSessionRepository {
   Future<void> saveSetTimerState(ActiveSetTimerState state);
   Future<void> saveRestState(ActiveRestState restState);
   Future<void> saveScoreStopwatchState(ActiveScoreStopwatchState state);
+  Future<void> saveManualScoreState(ActiveManualScoreState state);
   Future<void> saveExerciseStepProgressState(
     ActiveExerciseStepProgressState state,
   );
@@ -868,6 +870,13 @@ abstract interface class ActiveSessionRepository {
     required int setIndex,
     required DateTime deletedAt,
   });
+  Future<void> deleteManualScoreState({
+    required String sessionId,
+    required int programIndex,
+    required int exerciseIndex,
+    required int setIndex,
+    required DateTime deletedAt,
+  });
   Future<ActiveRestState?> findRestStateById(String id);
   Future<ActiveScoreStopwatchState?> findScoreStopwatchState({
     required String sessionId,
@@ -875,6 +884,12 @@ abstract interface class ActiveSessionRepository {
     required int exerciseIndex,
     required int setIndex,
   });
+  Future<ActiveManualScoreState?> findManualScoreState({
+    required String sessionId,
+    required int programIndex,
+    required int exerciseIndex,
+    required int setIndex,
+  });
   Future<ActiveSetTimerState?> findSetTimerState({
     required String sessionId,
     required int programIndex,
@@ -899,12 +914,19 @@ abstract interface class ActiveSessionRepository {
   Future<List<ActiveScoreStopwatchState>> listScoreStopwatchStates(
     String sessionId,
   );
+  Future<List<ActiveManualScoreState>> listManualScoreStates(String sessionId);
 }
 
 abstract interface class WorkoutHistoryRepository {
   Future<WorkoutHistory?> findById(String id);
   Future<List<WorkoutHistory>> listActive();
   Future<void> save(WorkoutHistory history);
+  Future<void> patchHeartRateSummary({
+    required String historyId,
+    required double averageHeartRateBpm,
+    required int maxHeartRateBpm,
+    required DateTime patchedAt,
+  });
   Future<void> saveSetResult(WorkoutHistorySetResult result);
   Future<void> saveStepResult(WorkoutHistoryStepResult result);
   Future<void> delete(String id, DateTime deletedAt);