TF-4082 Save text formatting menu state to user's preferences when send email or close composer

lib/features/mailbox_dashboard/domain/state/save_text_formatting_menu_state.dart

@@ -0,0 +1,17 @@
+import 'package:core/presentation/state/failure.dart';
+import 'package:core/presentation/state/success.dart';
+
+class SavingTextFormattingMenuState extends LoadingState {}
+
+class SaveTextFormattingMenuStateSuccess extends UIState {
+  final bool isDisplayed;
+
+  SaveTextFormattingMenuStateSuccess(this.isDisplayed);
+
+  @override
+  List<Object?> get props => [isDisplayed];
+}
+
+class SaveTextFormattingMenuStateFailure extends FeatureFailure {
+  SaveTextFormattingMenuStateFailure(dynamic exception) : super(exception: exception);
+}