チーム編集時の文字化け修正済み

lib/model/team.dart

@@ -1,5 +1,6 @@
 // lib/models/team.dart
 
+import 'dart:convert';
 import 'category.dart';
 import 'user.dart';
 
@@ -10,6 +11,7 @@ class Team {
   final NewCategory category;
   final User owner;
 
+
   Team({
     required this.id,
     required this.zekkenNumber,