Resolving an unrelated cloud conflict (Use cloud, Keep both) reloads the
page on screen, which closed Edit placement and threw away the user's
drags. A reload of the same page, the one that keeps undo history, now
keeps the edit open on whichever of its lineups survive. A drag stays
while the reload has its end where the drag started; an end the cloud
moved or removed shows the cloud's version, with a toast. Opening another
page still ends the edit without writing it.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>