TF-332 Add loadingState for update email drafts and get content email

lib/features/composer/domain/state/update_email_drafts_state.dart

@@ -1,6 +1,14 @@
 import 'package:core/core.dart';
 import 'package:jmap_dart_client/jmap/mail/email/email.dart';
 
+class UpdatingEmailDrafts extends UIState {
+
+  UpdatingEmailDrafts();
+
+  @override
+  List<Object?> get props => [];
+}
+
 class UpdateEmailDraftsSuccess extends UIState {
 
   final Email emailAsDrafts;

lib/features/composer/domain/usecases/update_email_drafts_interactor.dart

@@ -12,6 +12,7 @@ class UpdateEmailDraftsInteractor {
 
   Stream<Either<Failure, Success>> execute(AccountId accountId, Email newEmail, EmailId oldEmailId) async* {
     try {
+      yield Right<Failure, Success>(UpdatingEmailDrafts());
       final newEmailDrafts = await emailRepository.updateEmailDrafts(accountId, newEmail, oldEmailId);
       if (newEmailDrafts != null) {
         yield Right<Failure, Success>(UpdateEmailDraftsSuccess(newEmailDrafts));

lib/features/email/domain/state/get_email_content_state.dart

@@ -1,6 +1,14 @@
 import 'package:core/core.dart';
 import 'package:model/model.dart';
 
+class GetEmailContentLoading extends UIState {
+
+  GetEmailContentLoading();
+
+  @override
+  List<Object> get props => [];
+}
+
 class GetEmailContentSuccess extends UIState {
   final List<EmailContent> emailContents;
   final List<EmailContent> emailContentsDisplayed;
@@ -13,7 +21,7 @@ class GetEmailContentSuccess extends UIState {
 }
 
 class GetEmailContentFailure extends FeatureFailure {
-  final exception;
+  final dynamic exception;
 
   GetEmailContentFailure(this.exception);
 

lib/features/email/domain/usecases/get_email_content_interactor.dart

@@ -14,7 +14,7 @@ class GetEmailContentInteractor {
 
   Stream<Either<Failure, Success>> execute(AccountId accountId, EmailId emailId, String? baseDownloadUrl) async* {
     try {
-      yield Right<Failure, Success>(LoadingState());
+      yield Right<Failure, Success>(GetEmailContentLoading());
       final email = await emailRepository.getEmailContent(accountId, emailId);
 
       if (email.emailContentList.isNotEmpty) {

lib/features/email/presentation/email_view.dart

@@ -9,6 +9,7 @@ import 'package:jmap_dart_client/jmap/mail/email/email_address.dart';
 import 'package:model/model.dart';
 import 'package:tmail_ui_user/features/base/mixin/network_connection_mixin.dart';
 import 'package:tmail_ui_user/features/composer/presentation/extensions/prefix_email_address_extension.dart';
+import 'package:tmail_ui_user/features/email/domain/state/get_email_content_state.dart';
 import 'package:tmail_ui_user/features/email/presentation/email_controller.dart';
 import 'package:tmail_ui_user/features/email/presentation/widgets/app_bar_mail_widget_builder.dart';
 import 'package:tmail_ui_user/features/email/presentation/widgets/attachment_file_tile_builder.dart';
@@ -226,7 +227,7 @@ class EmailView extends GetWidget<EmailController> with NetworkConnectionMixin {
         return controller.viewState.value.fold(
           (failure) => const SizedBox.shrink(),
           (success) {
-            if (success is LoadingState) {
+            if (success is GetEmailContentLoading) {
               return const Align(alignment: Alignment.topCenter, child: Padding(
                   padding: EdgeInsets.all(16),
                   child: SizedBox(