TF-3082 Warn user and save identity cache on reload/session expired

lib/features/identity_creator/data/model/identity_cache_model.dart

@@ -0,0 +1,35 @@
+import 'package:jmap_dart_client/jmap/identities/identity.dart';
+import 'package:json_annotation/json_annotation.dart';
+import 'package:tmail_ui_user/features/identity_creator/domain/model/identity_cache.dart';
+import 'package:tmail_ui_user/features/manage_account/presentation/model/identity_action_type.dart';
+import 'package:tmail_ui_user/features/public_asset/data/model/public_assets_in_identity_arguments_model.dart';
+
+part 'identity_cache_model.g.dart';
+
+@JsonSerializable(includeIfNull: false, explicitToJson: true)
+class IdentityCacheModel extends IdentityCache {
+  IdentityCacheModel({
+    required super.identity,
+    required super.identityActionType,
+    required super.isDefault,
+    required this.publicAssetsInIdentityArgumentsModel})
+    : super(publicAssetsInIdentityArguments: publicAssetsInIdentityArgumentsModel);
+
+  final PublicAssetsInIdentityArgumentsModel? publicAssetsInIdentityArgumentsModel;
+
+  factory IdentityCacheModel.fromJson(Map<String, dynamic> json) 
+    => _$IdentityCacheModelFromJson(json);
+
+  Map<String, dynamic> toJson() => _$IdentityCacheModelToJson(this);
+
+  factory IdentityCacheModel.fromDomain(IdentityCache identityCache) {
+    return IdentityCacheModel(
+      identity: identityCache.identity,
+      identityActionType: identityCache.identityActionType,
+      isDefault: identityCache.isDefault,
+      publicAssetsInIdentityArgumentsModel: identityCache.publicAssetsInIdentityArguments == null
+        ? null
+        : PublicAssetsInIdentityArgumentsModel.fromDomain(identityCache.publicAssetsInIdentityArguments!)
+    );
+  }
+}