some fixes

lib/core/network/network_manager.dart

@@ -2,6 +2,7 @@ import 'dart:io';
 
 import 'package:dio/dio.dart';
 import 'package:shared_preferences/shared_preferences.dart';
+import 'package:tm_app/data/services/model/error/error_model.dart';
 import 'package:tm_app/data/services/model/login_response/login_response_model.dart';
 
 import '../config/app_config.dart';
@@ -305,15 +306,24 @@ class NetworkManager {
       return 'Unknown error';
     }
 
-    if (data is Map<String, dynamic>) {
-      return data['message'] ??
-          data['error'] ??
-          data['detail'] ??
-          'Unknown error';
-    }
+    try {
+      if (data is Map<String, dynamic>) {
+        final Object? nested = data['error'];
+        final Map<String, dynamic> json =
+            nested is Map<String, dynamic> ? nested : data;
+        final ErrorModel model = ErrorModel.fromJson(json);
+        return model.message ??
+            model.details ??
+            model.code ??
+            (data['detail'] as String?) ??
+            'Unknown error';
+      }
 
-    if (data is String) {
-      return data;
+      if (data is String) {
+        return data;
+      }
+    } catch (_) {
+      // fall through to default message
     }
 
     return 'Unknown error';