TF-3766 Make it easy to close context menu when open in email view

Signed-off-by: dab246 <tdvu@linagora.com>

lib/features/mailbox_dashboard/presentation/controller/mailbox_dashboard_controller.dart

@@ -265,6 +265,7 @@ class MailboxDashBoardController extends ReloadableController
   final isSenderImportantFlagEnabled = RxBool(true);
   final isAppGridDialogDisplayed = RxBool(false);
   final isDrawerOpened = RxBool(false);
+  final isContextMenuOpened = RxBool(false);
 
   Session? sessionCurrent;
   Map<Role, MailboxId> mapDefaultMailboxIdByRole = {};