Use the title of the PrefsBoxOrderItemRow (AdwActionRow) for the item
name instead of a label in the prefix. Aside from generally being more
correct, item names now wrap correctly, avoiding the settings window
breaking (being cut off by default to the right with even the close
button not showing, until resizing) with long item names.
Also handle drag events in this function so connecting to "drag-end" in
widgets with "GtkDragSource" and a `globalThis` `ScrollManager` instance
aren't needed.