make EntryListPage title elide when text is too wide

otherwise with a long title the actions could be inaccessible because they would get pushed clear off the screen

largely copied from https://invent.kde.org/frameworks/kirigami/-/blob/8c304c74159f3ed8b6bd93a8fdf59ab0d5033a08/src/controls/private/DefaultPageTitleDelegate.qml