add loco legs panel

lib/components/traction/traction_card.dart

@@ -9,6 +9,7 @@ class TractionCard extends StatelessWidget {
     required this.isSelected,
     required this.onShowInfo,
     required this.onOpenTimeline,
+    this.onOpenLegs,
     this.onToggleSelect,
   });
 
@@ -17,6 +18,7 @@ class TractionCard extends StatelessWidget {
   final bool isSelected;
   final VoidCallback onShowInfo;
   final VoidCallback onOpenTimeline;
+  final VoidCallback? onOpenLegs;
   final VoidCallback? onToggleSelect;
 
   @override
@@ -93,6 +95,14 @@ class TractionCard extends StatelessWidget {
                   icon: const Icon(Icons.timeline),
                   label: const Text('Timeline'),
                 ),
+                if (hasMileageOrTrips && onOpenLegs != null) ...[
+                  const SizedBox(width: 8),
+                  TextButton.icon(
+                    onPressed: onOpenLegs,
+                    icon: const Icon(Icons.view_list),
+                    label: const Text('Legs'),
+                  ),
+                ],
                 const Spacer(),
                 if (selectionMode && onToggleSelect != null)
                   TextButton.icon(