refs #19268 [finc] cover loader performance boost

* avoid redirect after list action in layout context
** override Vufind CartController::redirectToSource for bulk export and mail
** override Vufind CartController::deleteAction for bulk delete
** override Vufind RecordController::saveAction for saving favorites on result list
* use empty template for rendering messages in lightbox
** override Vufind RecordController::processSave instead of saveAction
** render messages in new message.phtml