Improve entries page and latest changes panel, units on events and timeline

lib/services/data_service/data_service_core.dart

@@ -48,6 +48,9 @@ class DataService extends ChangeNotifier {
   List<LocoChange> get latestLocoChanges => _latestLocoChanges;
   bool _isLatestLocoChangesLoading = false;
   bool get isLatestLocoChangesLoading => _isLatestLocoChangesLoading;
+  bool _latestLocoChangesHasMore = false;
+  bool get latestLocoChangesHasMore => _latestLocoChangesHasMore;
+  int _latestLocoChangesFetched = 0;
   final Map<int, List<LocoAttrVersion>> _locoTimelines = {};
   final Map<int, bool> _isLocoTimelineLoading = {};
   List<LocoAttrVersion> timelineForLoco(int locoId) =>

lib/services/data_service/data_service_traction.dart

@@ -115,7 +115,11 @@ extension DataServiceTraction on DataService {
     return _locoClasses;
   }
 
-  Future<void> fetchLatestLocoChanges({int limit = 25, int offset = 0}) async {
+  Future<void> fetchLatestLocoChanges({
+    int limit = 100,
+    int offset = 0,
+    bool append = false,
+  }) async {
     _isLatestLocoChangesLoading = true;
     _notifyAsync();
     try {
@@ -138,16 +142,41 @@ extension DataServiceTraction on DataService {
             );
           }
         }
-        _latestLocoChanges = parsed;
+        if (append) {
+          _latestLocoChanges = [..._latestLocoChanges, ...parsed];
+        } else {
+          _latestLocoChanges = parsed;
+        }
+        final fetchedCount = parsed.length;
+        _latestLocoChangesFetched = append
+            ? offset + fetchedCount
+            : fetchedCount;
+        _latestLocoChangesHasMore = _latestLocoChangesFetched < 5000;
       } else {
         throw Exception('Unexpected latest loco changes response: $json');
       }
     } catch (e) {
       debugPrint('Failed to fetch latest loco changes: $e');
       _latestLocoChanges = [];
+      _latestLocoChangesHasMore = false;
+      _latestLocoChangesFetched = 0;
     } finally {
       _isLatestLocoChangesLoading = false;
       _notifyAsync();
     }
   }
+
+  Future<Map<String, dynamic>?> fetchClassStats(String locoClass) async {
+    try {
+      final path = Uri.encodeComponent(locoClass);
+      final json = await api.get('/loco/class/stats/$path/user');
+      if (json is Map) {
+        return Map<String, dynamic>.from(json);
+      }
+      debugPrint('Unexpected class stats response for $locoClass: $json');
+    } catch (e) {
+      debugPrint('Failed to fetch class stats for $locoClass: $e');
+    }
+    return null;
+  }
 }