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/infrastructure/local/app_database.dart

@@ -10,6 +10,7 @@ part 'app_database.g.dart';
     ActiveExerciseStepProgressStates,
     ActiveExerciseStepResults,
     ActiveRestStates,
+    ActiveManualScoreStates,
     ActiveScoreStopwatchStates,
     ActiveSetTimerStates,
     ActiveSetResults,
@@ -48,7 +49,7 @@ final class AppDatabase extends _$AppDatabase {
   }
 
   @override
-  int get schemaVersion => 19;
+  int get schemaVersion => 22;
 
   @override
   MigrationStrategy get migration {
@@ -119,6 +120,15 @@ final class AppDatabase extends _$AppDatabase {
         if (from < 19) {
           await _migrateToSchema19();
         }
+        if (from < 20) {
+          await _migrateToSchema20(migrator);
+        }
+        if (from < 21) {
+          await _migrateToSchema21();
+        }
+        if (from < 22) {
+          await _migrateToSchema22();
+        }
         await _createIndexes();
       },
       beforeOpen: (details) async {
@@ -199,6 +209,10 @@ final class AppDatabase extends _$AppDatabase {
       'CREATE INDEX IF NOT EXISTS idx_active_set_results_session_id '
       'ON active_set_results (active_workout_session_id)',
     );
+    await customStatement(
+      'CREATE INDEX IF NOT EXISTS idx_active_manual_score_states_session_id '
+      'ON active_manual_score_states (active_workout_session_id)',
+    );
     await customStatement(
       'CREATE INDEX IF NOT EXISTS idx_active_score_stopwatch_states_session_id '
       'ON active_score_stopwatch_states (active_workout_session_id)',
@@ -288,6 +302,7 @@ final class AppDatabase extends _$AppDatabase {
 const _syncableTableNames = [
   'active_exercise_step_progress_states',
   'active_exercise_step_results',
+  'active_manual_score_states',
   'active_rest_states',
   'active_score_stopwatch_states',
   'active_set_timer_states',
@@ -770,6 +785,37 @@ CREATE TABLE IF NOT EXISTS active_set_timer_states (
     );
   }
 
+  Future<void> _migrateToSchema20(Migrator migrator) async {
+    await migrator.createTable(activeManualScoreStates);
+  }
+
+  Future<void> _migrateToSchema21() async {
+    await _addColumnIfMissing(
+      tableName: 'workout_history',
+      columnName: 'average_heart_rate_bpm',
+      definition:
+          'average_heart_rate_bpm REAL CHECK '
+          '(average_heart_rate_bpm IS NULL OR average_heart_rate_bpm > 0)',
+    );
+    await _addColumnIfMissing(
+      tableName: 'workout_history',
+      columnName: 'max_heart_rate_bpm',
+      definition:
+          'max_heart_rate_bpm INTEGER CHECK '
+          '(max_heart_rate_bpm IS NULL OR max_heart_rate_bpm > 0)',
+    );
+  }
+
+  Future<void> _migrateToSchema22() async {
+    await _addColumnIfMissing(
+      tableName: 'exercise_steps',
+      columnName: 'linked_to_series_score',
+      definition:
+          'linked_to_series_score INTEGER NOT NULL DEFAULT 0 '
+          'CHECK (linked_to_series_score IN (0, 1))',
+    );
+  }
+
   Future<void> _backfillWorkoutHistorySetSourceExerciseIds() async {
     await customStatement(r'''
 UPDATE workout_history_set_results AS result