fix(core): fusionne la strategie Health Services au niveau seance et nullifie sourceExerciseId au pull si absent

Complement #183 : fusion de la strategie Health Services au niveau seance pour eviter que le premier exercice fige tout le choix de strategie sur la seance.
Fix #185 : nullification defensive de sourceExerciseId au pull quand l'exercice source est absent, pour ne plus casser le chargement des programmes apres suppression d'un exercice.

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

lib/application/use_cases.dart

@@ -4160,6 +4160,10 @@ final class WatchSessionProjectionProjector {
       currentStep: currentStep,
       timers: allTimers,
     );
+    final healthServicesExerciseTypeStrategy =
+        _sessionHealthServicesExerciseTypeStrategy(
+          session.resolvedTemplateSnapshotJson,
+        );
 
     return WatchSessionProjection(
       deviceSessionId: session.metadata.id,
@@ -4220,8 +4224,7 @@ final class WatchSessionProjectionProjector {
       manualScoreTargetLabel: manualScoreProjection?.targetLabel,
       manualScoreRepsTargetValue: manualScoreProjection?.repsTargetValue,
       manualScoreScope: manualScoreProjection?.scope,
-      healthServicesExerciseTypeStrategy:
-          snapshot.healthServicesExerciseTypeStrategy,
+      healthServicesExerciseTypeStrategy: healthServicesExerciseTypeStrategy,
     );
   }
 
@@ -7216,14 +7219,73 @@ _ResolvedExerciseSnapshot? _findExerciseSnapshot({
     scoreUnitSnapshot: exercise['scoreUnitSnapshot'] as String?,
     setsCount: exercise['setsCount'] as int? ?? 0,
     restSeconds: exercise['restSecondsOverride'] as int? ?? 0,
-    healthServicesExerciseTypeStrategy: _stringListFromSnapshot(
-      exercise['healthServicesExerciseTypeStrategy'],
-    ),
     steps: _exerciseStepsFromSnapshot(exercise['exerciseStepsSnapshot']),
     autoStartNextTimedStepEffective: autoStartNextTimedStepEffective,
   );
 }
 
+const _legacyHealthServicesExerciseTypeStrategy = [
+  'RUNNING',
+  'WALKING',
+  'HIGH_INTENSITY_INTERVAL_TRAINING',
+  'WORKOUT',
+];
+
+const _knownHealthServicesExerciseTypeNames = {
+  'RUNNING',
+  'WALKING',
+  'HIGH_INTENSITY_INTERVAL_TRAINING',
+  'WORKOUT',
+};
+
+List<String> _sessionHealthServicesExerciseTypeStrategy(
+  String resolvedTemplateSnapshotJson,
+) {
+  try {
+    final decoded =
+        jsonDecode(resolvedTemplateSnapshotJson) as Map<String, dynamic>;
+    final programs = (decoded['programs'] as List<dynamic>? ?? const []);
+    final output = <String>[];
+    void add(String type) {
+      if (_knownHealthServicesExerciseTypeNames.contains(type) &&
+          !output.contains(type)) {
+        output.add(type);
+      }
+    }
+
+    for (final rawProgram in programs) {
+      if (rawProgram is! Map) {
+        continue;
+      }
+      final program = Map<String, dynamic>.from(rawProgram);
+      final programSnapshotJson = program['programSnapshotJson'] as String?;
+      if (programSnapshotJson == null) {
+        continue;
+      }
+      final programSnapshot =
+          jsonDecode(programSnapshotJson) as Map<String, dynamic>;
+      final exercises =
+          (programSnapshot['exercises'] as List<dynamic>? ?? const []);
+      for (final rawExercise in exercises) {
+        if (rawExercise is! Map) {
+          continue;
+        }
+        final exercise = Map<String, dynamic>.from(rawExercise);
+        for (final type in _stringListFromSnapshot(
+          exercise['healthServicesExerciseTypeStrategy'],
+        )) {
+          add(type);
+        }
+      }
+    }
+    return output.isEmpty
+        ? _legacyHealthServicesExerciseTypeStrategy
+        : List.unmodifiable(output);
+  } on Object {
+    return _legacyHealthServicesExerciseTypeStrategy;
+  }
+}
+
 bool? _templateStepChainingOverride(
   Map<String, dynamic> resolvedTemplateSnapshot, {
   required String workoutTemplateProgramId,
@@ -7439,9 +7501,6 @@ Map<String, _ResolvedExerciseSnapshot> _exerciseSnapshotsById(
         scoreUnitSnapshot: exercise['scoreUnitSnapshot'] as String?,
         setsCount: exercise['setsCount'] as int? ?? 0,
         restSeconds: exercise['restSecondsOverride'] as int? ?? 0,
-        healthServicesExerciseTypeStrategy: _stringListFromSnapshot(
-          exercise['healthServicesExerciseTypeStrategy'],
-        ),
         steps: _exerciseStepsFromSnapshot(exercise['exerciseStepsSnapshot']),
         autoStartNextTimedStepEffective:
             (exercise['autoStartNextTimedStepOverride'] as bool?) ??
@@ -7472,7 +7531,6 @@ final class _ResolvedExerciseSnapshot {
     this.scoreUnitSnapshot,
     required this.setsCount,
     required this.restSeconds,
-    this.healthServicesExerciseTypeStrategy = const [],
     this.steps = const [],
     this.autoStartNextTimedStepEffective = true,
   });
@@ -7494,7 +7552,6 @@ final class _ResolvedExerciseSnapshot {
   final String? scoreUnitSnapshot;
   final int setsCount;
   final int restSeconds;
-  final List<String> healthServicesExerciseTypeStrategy;
   final List<ExerciseStep> steps;
   final bool autoStartNextTimedStepEffective;
 }