TF-3939 Add action Select all in mobile view

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

lib/features/thread/presentation/extensions/handle_press_email_selection_action.dart

@@ -23,6 +23,8 @@ extension HandlePressEmailSelectionActionExtension on ThreadController {
       pressEmailSelectionAction(emailActionType, emails);
     } else if (type == EmailSelectionActionType.moreAction) {
       _showMoreActionMenu(context, emails, selectedMailbox);
+    } else if (type == EmailSelectionActionType.selectAll) {
+      _showSelectAllEmails();
     }
   }
 
@@ -80,4 +82,10 @@ extension HandlePressEmailSelectionActionExtension on ThreadController {
       },
     );
   }
+
+  void _showSelectAllEmails() {
+    if (mailboxDashBoardController.emailsInCurrentMailbox.isAnySelectionInActive) {
+      setSelectAllEmailAction();
+    }
+  }
 }