feat(exercice): plan de séance et historique avec résultats d'étapes (ticket #61)

Affiche le plan de séance et l'historique avec les résultats par
étape sur workout_execution_screen.dart et history_screen.dart.
flutter pub get OK, dart format appliqué (3 fichiers reformatés),
analyze propre (mêmes infos préexistantes), 102/102 tests verts,
build APK debug validé. Dernier ticket UI du chantier "Exercice à
plusieurs étapes" (#54) — il ne reste que la QA finale (#62).

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

test/presentation/workout_execution_screen_test.dart

@@ -837,6 +837,72 @@ void main() {
     expect(find.textContaining('Temps réalisé 00:38.7'), findsNothing);
   });
 
+  testWidgets('le plan affiche le résumé de séquence d’une série', (
+    tester,
+  ) async {
+    final clock = _FakeClock(DateTime.utc(2026, 7, 17, 12));
+    final repository = _FakeActiveSessionRepository();
+    final session = ActiveWorkoutSession(
+      metadata: _metadata('session-1'),
+      sourceWorkoutTemplateId: 'template-1',
+      status: ActiveWorkoutStatus.running,
+      startedAt: DateTime.utc(2026, 7, 17, 12),
+      lastPersistedAt: DateTime.utc(2026, 7, 17, 12),
+      elapsedActiveMs: 0,
+      currentProgramIndex: 0,
+      currentExerciseIndex: 0,
+      currentSetIndex: 0,
+      resolvedTemplateSnapshotJson: _sessionSnapshot(
+        setsCount: 2,
+        targetReps: 2,
+        exerciseSteps: [
+          _step('step-1', 0, 'Gauche', ExerciseStepType.reps, 4),
+          _step('step-2', 1, 'Droite', ExerciseStepType.reps, 4),
+        ],
+      ),
+    );
+    repository.session = session;
+    repository.stepResults.add(
+      ActiveExerciseStepResult(
+        metadata: _metadata('step-result-1'),
+        activeWorkoutSessionId: 'session-1',
+        programSnapshotId: 'template-program-1',
+        exerciseSnapshotId: 'exercise-1',
+        programIndex: 0,
+        exerciseIndex: 0,
+        setIndex: 0,
+        passageIndex: 0,
+        stepIndex: 0,
+        stepSnapshotId: 'step-1',
+        stepNameSnapshot: 'Gauche',
+        stepTypeSnapshot: ExerciseStepType.reps,
+        targetValueSnapshot: 4,
+        hasScoreSnapshot: false,
+        status: SetResultStatus.completed,
+        actualReps: 4,
+      ),
+    );
+
+    await tester.pumpWidget(
+      MaterialApp(
+        home: WorkoutExecutionScreen(
+          initialSession: session,
+          activeUseCases: _activeUseCases(repository, clock),
+          stepUseCases: _stepUseCases(repository, clock),
+          stepAudioCuePlayer: _FakeStepAudioCuePlayer(),
+          closeUseCase: _closeUseCase(repository, clock),
+          historyUseCases: _historyUseCases(clock),
+          workoutTemplateUseCases: _workoutTemplateUseCases(),
+        ),
+      ),
+    );
+
+    await tester.tap(find.byTooltip('Voir le plan'));
+    await tester.pumpAndSettle();
+
+    expect(find.text('Séquence : 1/2 étapes · Passage 1/2'), findsOneWidget);
+  });
+
   testWidgets(
     'modifier une série passée la termine sans changer la position courante',
     (tester) async {
@@ -1011,9 +1077,7 @@ void main() {
       currentSetIndex: 0,
       resolvedTemplateSnapshotJson: _sessionSnapshot(
         targetReps: 1,
-        exerciseSteps: [
-          _step('step-1', 0, 'Pompes', ExerciseStepType.reps, 8),
-        ],
+        exerciseSteps: [_step('step-1', 0, 'Pompes', ExerciseStepType.reps, 8)],
       ),
     );
     repository.session = session;
@@ -1170,9 +1234,7 @@ void main() {
       currentSetIndex: 0,
       resolvedTemplateSnapshotJson: _sessionSnapshot(
         targetReps: 2,
-        exerciseSteps: [
-          _step('step-1', 0, 'Pompes', ExerciseStepType.reps, 4),
-        ],
+        exerciseSteps: [_step('step-1', 0, 'Pompes', ExerciseStepType.reps, 4)],
       ),
     );
     repository.session = session;
@@ -1220,9 +1282,7 @@ void main() {
         setsCount: 2,
         restSeconds: 0,
         targetReps: 2,
-        exerciseSteps: [
-          _step('step-1', 0, 'Pompes', ExerciseStepType.reps, 4),
-        ],
+        exerciseSteps: [_step('step-1', 0, 'Pompes', ExerciseStepType.reps, 4)],
       ),
     );
     repository.session = session;
@@ -1667,9 +1727,7 @@ final class _FakeActiveSessionRepository implements ActiveSessionRepository {
   }
 
   @override
-  Future<void> saveExerciseStepResult(
-    ActiveExerciseStepResult result,
-  ) async {
+  Future<void> saveExerciseStepResult(ActiveExerciseStepResult result) async {
     final index = stepResults.indexWhere(
       (saved) =>
           saved.activeWorkoutSessionId == result.activeWorkoutSessionId &&