A workbench with the folded records in a rail, the survivor's fields live and
editable beside them, and per-field actions chosen by what kind of field it is.
Fields the records agree on stay out of the way. Reachable from a duplicate
group and from the selection toolbar, which is the only way to merge a pair the
detector never proposed.
Adds the per-library review screen, a muted note in the upload tray for a book
that may already be held, and the remote functions behind them. The tray note
is deliberately weaker than the file-level one, which means something stronger.