feat(ui): affichage du chrono de score dans le plan et l'historique (ticket #28)

Affiche le chrono du score chronométré sur workout_execution_screen.dart
(plan de séance) et history_screen.dart (historique). flutter analyze
propre, 77/77 tests verts, build APK debug validé. Dernier ticket du
backlog — clôture aussi le ticket parent #18 (score chronométré).

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

test/presentation/history_screen_test.dart

@@ -50,6 +50,31 @@ void main() {
     );
   });
 
+  testWidgets('le détail affiche le score chrono comme temps réalisé', (
+    tester,
+  ) async {
+    await tester.pumpWidget(
+      MaterialApp(
+        home: HistoryDetailScreen(
+          history: _history(id: 'history-1', stopwatchScore: true),
+          historyUseCases: _historyUseCases(_FakeWorkoutHistoryRepository()),
+          workoutTemplateUseCases: _workoutTemplateUseCases(),
+          activeUseCases: _activeUseCases(),
+          closeUseCase: _closeUseCase(),
+        ),
+      ),
+    );
+
+    expect(
+      find.text(
+        'Temps 00:45 · 10 répétitions · '
+        'Temps réalisé : 00:38.7 / objectif 00:45',
+      ),
+      findsOneWidget,
+    );
+    expect(find.textContaining('Score 38.7'), findsNothing);
+  });
+
   testWidgets('la suppression demande une confirmation', (tester) async {
     final repository = _FakeWorkoutHistoryRepository();
 
@@ -85,7 +110,11 @@ void main() {
   });
 }
 
-WorkoutHistory _history({required String id, DateTime? startedAt}) {
+WorkoutHistory _history({
+  required String id,
+  DateTime? startedAt,
+  bool stopwatchScore = false,
+}) {
   final start = startedAt ?? DateTime.utc(2026, 7, 17, 10);
   return WorkoutHistory(
     metadata: _metadata(id),
@@ -98,7 +127,9 @@ WorkoutHistory _history({required String id, DateTime? startedAt}) {
     completed: true,
     historySnapshotJson: jsonEncode({
       'sessionId': 'session-1',
-      'resolvedTemplateSnapshotJson': _resolvedSnapshot(),
+      'resolvedTemplateSnapshotJson': _resolvedSnapshot(
+        stopwatchScore: stopwatchScore,
+      ),
       'results': [
         {
           'programSnapshotId': 'program-snapshot-1',
@@ -108,16 +139,21 @@ WorkoutHistory _history({required String id, DateTime? startedAt}) {
           'setIndex': 0,
           'actualTimeMs': 45000,
           'actualReps': 10,
-          'actualScore': 80,
+          if (stopwatchScore) 'actualScoreTimeMs': 38700,
+          if (!stopwatchScore) 'actualScore': 80,
           'scoreLabelSnapshot': 'Charge',
-          'scoreUnitSnapshot': 'kg',
+          'scoreInputModeSnapshot': stopwatchScore
+              ? ScoreInputMode.stopwatch.name
+              : ScoreInputMode.manual.name,
+          if (!stopwatchScore) 'scoreUnitSnapshot': 'kg',
+          if (stopwatchScore) 'targetScoreTimeMsSnapshot': 45000,
         },
       ],
     }),
   );
 }
 
-String _resolvedSnapshot() {
+String _resolvedSnapshot({bool stopwatchScore = false}) {
   return jsonEncode({
     'name': 'Séance jambes',
     'programs': [
@@ -135,9 +171,13 @@ String _resolvedSnapshot() {
               'scoreEnabled': true,
               'targetTimeSeconds': 45,
               'targetReps': 10,
-              'targetScore': 80,
+              if (stopwatchScore) 'targetScoreTimeMs': 45000,
+              if (!stopwatchScore) 'targetScore': 80,
+              'scoreInputModeSnapshot': stopwatchScore
+                  ? ScoreInputMode.stopwatch.name
+                  : ScoreInputMode.manual.name,
               'scoreLabelSnapshot': 'Charge',
-              'scoreUnitSnapshot': 'kg',
+              if (!stopwatchScore) 'scoreUnitSnapshot': 'kg',
               'restSecondsOverride': 0,
             },
           ],