added more info on stations in UI

lib/model/flood_station.dart

@@ -6,6 +6,7 @@ class FloodStation {
   final DateTime? dateOpened;
   final String catchmentName;
   final String label;
+  final String riverName;
 
   FloodStation({
     required this.id,
@@ -15,6 +16,7 @@ class FloodStation {
     this.dateOpened,
     required this.catchmentName,
     required this.label,
+    required this.riverName,
   });
 
   factory FloodStation.fromMap(Map<String, dynamic> json) => FloodStation(
@@ -25,6 +27,7 @@ class FloodStation {
         dateOpened: DateTime.tryParse(json['dateOpened'] ?? ''),
         catchmentName: parseStringValue(json['catchmentName']),
         label: parseStringValue(json['label']),
+        riverName: parseStringValue(json['riverName']),
       );
 
   static double parseDoubleValue(dynamic value) {