Layout changes, fix bugs in new entry page

lib/services/data_service/data_service_trips.dart

@@ -83,5 +83,50 @@ extension DataServiceTrips on DataService {
       _notifyAsync();
     }
   }
-}
 
+  Future<void> fetchTripOptions() async {
+    try {
+      final json = await api.get('/trips');
+      Iterable<dynamic>? raw;
+      if (json is List) {
+        raw = json;
+      } else if (json is Map) {
+        for (final key in ['trips', 'trip_data', 'data']) {
+          final value = json[key];
+          if (value is List) {
+            raw = value;
+            break;
+          }
+        }
+      }
+      if (raw != null) {
+        final tripMap = raw
+            .whereType<Map<String, dynamic>>()
+            .map((e) => TripSummary.fromJson(e))
+            .toList();
+
+        _tripList = [...tripMap]..sort((a, b) => b.tripId.compareTo(a.tripId));
+      } else {
+        debugPrint('Unexpected trip list response: $json');
+        _tripList = [];
+      }
+    } catch (e) {
+      debugPrint('Failed to fetch trip list: $e');
+      _tripList = [];
+    } finally {
+      _notifyAsync();
+    }
+  }
+
+  void upsertTripSummary(TripSummary trip) {
+    final existingIndex =
+        _tripList.indexWhere((element) => element.tripId == trip.tripId);
+    if (existingIndex >= 0) {
+      _tripList[existingIndex] = trip;
+    } else {
+      _tripList = [trip, ..._tripList];
+    }
+    _tripList.sort((a, b) => b.tripId.compareTo(a.tripId));
+    _notifyAsync();
+  }
+}