TF-105 [BUG] Fix loading is blinking when reading email

lib/features/email/presentation/model/web_view_state.dart

@@ -4,6 +4,13 @@ import 'package:core/core.dart';
 class WebViewLoadingState extends UIState {
   WebViewLoadingState();
 
+  @override
+  List<Object?> get props => [];
+}
+
+class WebViewLoadCompletedState extends UIState {
+  WebViewLoadCompletedState();
+
   @override
   List<Object?> get props => [];
 }