list traction and add leaderboard panel

lib/services/dataService.dart

@@ -13,6 +13,9 @@ class DataService extends ChangeNotifier {
   List<Leg> _legs = [];
   List<Leg> get legs => _legs;
 
+  List<LocoSummary> _traction = [];
+  List<LocoSummary> get traction => _traction;
+
   bool _isHomepageLoading = false;
   bool get isHomepageLoading => _isHomepageLoading;
 
@@ -31,23 +34,36 @@ class DataService extends ChangeNotifier {
       notifyListeners();
     }
   }
-  
-  Future<void> fetchLegs({
-  int offset = 0,
-  int limit = 100,
-  String sortBy = 'date',
-  int sortDirection = 0,
-}) async {
-  final query = '?sort_direction=$sortDirection&sort_by=$sortBy&offset=$offset&limit=$limit';
-  final json = await api.get('/user/legs$query');
 
-  if (json is List) {
-    _legs = json.map((e) => Leg.fromJson(e)).toList();
-    notifyListeners();
-  } else {
-    throw Exception('Unexpected legs response: $json');
+  Future<void> fetchLegs({
+    int offset = 0,
+    int limit = 100,
+    String sortBy = 'date',
+    int sortDirection = 0,
+  }) async {
+    final query =
+        '?sort_direction=$sortDirection&sort_by=$sortBy&offset=$offset&limit=$limit';
+    final json = await api.get('/user/legs$query');
+
+    if (json is List) {
+      _legs = json.map((e) => Leg.fromJson(e)).toList();
+      notifyListeners();
+    } else {
+      throw Exception('Unexpected legs response: $json');
+    }
+  }
+
+  Future<void> fetchHadTraction({int offset = 0, int limit = 100}) async {
+    final query = '?offset=$offset&limit=$limit';
+    final json = await api.get('/loco/mileage$query');
+
+    if (json is List) {
+      _traction = json.map((e) => LocoSummary.fromJson(e)).toList();
+      notifyListeners();
+    } else {
+      throw Exception('Unexpected traction response: $json');
+    }
   }
-}
 
   void clear() {
     _homepageStats = null;