feat(watch): renforce la vibration de fin de chrono et consolide la remontee des donnees stats montre

Cote montre pour #180 (vibration timerFinished plus longue et plus forte) et #179 (contrat/collecte des donnees stats vers le telephone).

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

packages/watch_bridge_contract/lib/src/watch_bridge_contract.dart

@@ -1,4 +1,4 @@
-const int watchBridgeSchemaVersion = 5;
+const int watchBridgeSchemaVersion = 6;
 
 enum WatchCommandType {
   startCurrentExercise,
@@ -617,6 +617,7 @@ final class WatchSensorSample {
     this.heartRateBpm,
     this.distanceMeters,
     this.caloriesKcal,
+    this.sensorCollectionStatus,
   }) : capturedAtEpochMs = capturedAtEpochMs ?? recordedAtEpochMs ?? 0;
 
   factory WatchSensorSample.fromJson(Map<String, Object?> json) {
@@ -642,6 +643,9 @@ final class WatchSensorSample {
       heartRateBpm: _nullableIntFromJson(json['heartRateBpm']),
       distanceMeters: _nullableDoubleFromJson(json['distanceMeters']),
       caloriesKcal: _nullableDoubleFromJson(json['caloriesKcal']),
+      sensorCollectionStatus: _nullableStringFromJson(
+        json['sensorCollectionStatus'],
+      ),
     );
   }
 
@@ -660,6 +664,7 @@ final class WatchSensorSample {
   final int? heartRateBpm;
   final double? distanceMeters;
   final double? caloriesKcal;
+  final String? sensorCollectionStatus;
 
   int get recordedAtEpochMs => capturedAtEpochMs;
 
@@ -681,6 +686,7 @@ final class WatchSensorSample {
       'heartRateBpm': heartRateBpm,
       'distanceMeters': distanceMeters,
       'caloriesKcal': caloriesKcal,
+      'sensorCollectionStatus': sensorCollectionStatus,
     };
   }
 
@@ -702,7 +708,8 @@ final class WatchSensorSample {
             stepSnapshotId == other.stepSnapshotId &&
             heartRateBpm == other.heartRateBpm &&
             distanceMeters == other.distanceMeters &&
-            caloriesKcal == other.caloriesKcal;
+            caloriesKcal == other.caloriesKcal &&
+            sensorCollectionStatus == other.sensorCollectionStatus;
   }
 
   @override
@@ -723,6 +730,7 @@ final class WatchSensorSample {
       heartRateBpm,
       distanceMeters,
       caloriesKcal,
+      sensorCollectionStatus,
     );
   }
 }

packages/watch_bridge_contract/test/watch_bridge_contract_test.dart

@@ -151,6 +151,7 @@ void main() {
         heartRateBpm: 142,
         distanceMeters: 840.5,
         caloriesKcal: 184.2,
+        sensorCollectionStatus: 'active',
       );
 
       final decoded = WatchSensorSample.fromJson(