update main model

lib/domain/entities/user.dart

@@ -16,8 +16,8 @@ class User {
   String? fcsID;
   DateTime? lastMessageTime;
   String? lastMessage;
-  int? userUnseenCount;
-  int? fcsUnseenCount;
+  int userUnseenCount;
+  int fcsUnseenCount;
   String? preferCurrency;
 
   String get initial =>
@@ -42,12 +42,12 @@ class User {
   }
 
   String get getUserUnseenCount => userUnseenCount != null
-      ? userUnseenCount! > 100
+      ? userUnseenCount > 100
           ? "99+"
           : userUnseenCount.toString()
       : "0";
   String get getFcsUnseenCount => fcsUnseenCount != null
-      ? fcsUnseenCount! > 100
+      ? fcsUnseenCount > 100
           ? "99+"
           : fcsUnseenCount.toString()
       : "0";
@@ -72,8 +72,8 @@ class User {
       this.privileges = const [],
       this.lastMessage,
       this.lastMessageTime,
-      this.userUnseenCount,
-      this.fcsUnseenCount,
+      this.userUnseenCount = 0,
+      this.fcsUnseenCount = 0,
       this.preferCurrency});
 
   factory User.fromJson(Map<String, dynamic> json) {