few fixes and made sure ledger widget displays the name of ledger wallet

frontend/pshared/lib/data/dto/payment/operation.dart

@@ -1,3 +1,8 @@
+import 'package:json_annotation/json_annotation.dart';
+
+part 'operation.g.dart';
+
+@JsonSerializable()
 class PaymentOperationDTO {
   final String? stepRef;
   final String? operationRef;
@@ -24,37 +29,6 @@ class PaymentOperationDTO {
   });
 
   factory PaymentOperationDTO.fromJson(Map<String, dynamic> json) =>
-      PaymentOperationDTO(
-        stepRef: _asString(json['stepRef'] ?? json['step_ref']),
-        operationRef: _asString(json['operationRef'] ?? json['operation_ref']),
-        gateway: _asString(json['gateway']),
-        code: _asString(json['code']),
-        state: _asString(json['state']),
-        label: _asString(json['label']),
-        failureCode: _asString(json['failureCode'] ?? json['failure_code']),
-        failureReason: _asString(
-          json['failureReason'] ?? json['failure_reason'],
-        ),
-        startedAt: _asString(json['startedAt'] ?? json['started_at']),
-        completedAt: _asString(json['completedAt'] ?? json['completed_at']),
-      );
-
-  Map<String, dynamic> toJson() => <String, dynamic>{
-    'stepRef': stepRef,
-    'operationRef': operationRef,
-    'gateway': gateway,
-    'code': code,
-    'state': state,
-    'label': label,
-    'failureCode': failureCode,
-    'failureReason': failureReason,
-    'startedAt': startedAt,
-    'completedAt': completedAt,
-  };
-}
-
-String? _asString(Object? value) {
-  final text = value?.toString().trim();
-  if (text == null || text.isEmpty) return null;
-  return text;
+      _$PaymentOperationDTOFromJson(json);
+  Map<String, dynamic> toJson() => _$PaymentOperationDTOToJson(this);
 }