feat(exécution): dernière performance et meilleur score par exercice (ticket #81)

Ajoute la migration Drift v17 (colonne sourceExerciseIdSnapshot sur
workout_history_set_results et workout_history_step_results, index
associés), le port ExercisePerformanceReferenceRepository et son
implémentation Drift, et le use case
ExercisePerformanceReferenceUseCase (dernière performance + meilleur
score par métrique active pour un exercice donné).

Validé GO par Main : dart analyze propre (1 lint mineur de style),
178 tests (4 échecs préexistants sans rapport avec ce lot).

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

lib/application/ports.dart

@@ -466,6 +466,106 @@ abstract interface class WorkoutHistoryRepository {
   Future<void> delete(String id, DateTime deletedAt);
 }
 
+final class ActivePerformanceMeasures {
+  const ActivePerformanceMeasures({
+    required this.timeEnabled,
+    required this.repsEnabled,
+    required this.scoreEnabled,
+    this.scoreInputMode = ScoreInputMode.manual,
+  });
+
+  final bool timeEnabled;
+  final bool repsEnabled;
+  final bool scoreEnabled;
+  final ScoreInputMode scoreInputMode;
+
+  bool get hasAny => timeEnabled || repsEnabled || scoreEnabled;
+}
+
+enum PerformanceMetric { score, reps, time }
+
+final class WorkoutHistorySetPerformance {
+  const WorkoutHistorySetPerformance({
+    required this.workoutHistoryId,
+    required this.startedAt,
+    required this.setIndex,
+    required this.exerciseNameSnapshot,
+    required this.scoreInputModeSnapshot,
+    this.actualTimeMs,
+    this.actualReps,
+    this.actualScore,
+    this.actualScoreTimeMs,
+    this.completedAt,
+  });
+
+  final String workoutHistoryId;
+  final DateTime startedAt;
+  final int setIndex;
+  final String exerciseNameSnapshot;
+  final ScoreInputMode scoreInputModeSnapshot;
+  final int? actualTimeMs;
+  final int? actualReps;
+  final double? actualScore;
+  final int? actualScoreTimeMs;
+  final DateTime? completedAt;
+}
+
+final class WorkoutHistoryMetricPerformance {
+  const WorkoutHistoryMetricPerformance({
+    required this.workoutHistoryId,
+    required this.startedAt,
+    required this.setIndex,
+    required this.exerciseNameSnapshot,
+    required this.metric,
+    required this.scoreInputModeSnapshot,
+    this.actualTimeMs,
+    this.actualReps,
+    this.actualScore,
+    this.actualScoreTimeMs,
+    this.completedAt,
+  });
+
+  final String workoutHistoryId;
+  final DateTime startedAt;
+  final int setIndex;
+  final String exerciseNameSnapshot;
+  final PerformanceMetric metric;
+  final ScoreInputMode scoreInputModeSnapshot;
+  final int? actualTimeMs;
+  final int? actualReps;
+  final double? actualScore;
+  final int? actualScoreTimeMs;
+  final DateTime? completedAt;
+}
+
+final class ExercisePerformanceReference {
+  const ExercisePerformanceReference({
+    required this.hasAnyHistoryForExercise,
+    this.last,
+    this.record,
+  });
+
+  final bool hasAnyHistoryForExercise;
+  final WorkoutHistorySetPerformance? last;
+  final WorkoutHistoryMetricPerformance? record;
+}
+
+abstract interface class ExercisePerformanceReferenceRepository {
+  Future<bool> hasAnyCompletedHistoryForExercise(String exerciseId);
+
+  Future<WorkoutHistorySetPerformance?> findLatestSetPerformance({
+    required String exerciseId,
+    required ActivePerformanceMeasures activeMeasures,
+    required int currentSetIndex,
+  });
+
+  Future<WorkoutHistoryMetricPerformance?> findBestMetricPerformance({
+    required String exerciseId,
+    required PerformanceMetric metric,
+    required ScoreInputMode scoreInputMode,
+  });
+}
+
 final class SyncRunSummary {
   const SyncRunSummary({
     required this.pushedChanges,