The floating copy used to vanish the moment the finger lifted, so the block
snapped back to its old slot until the provider notified and the query
re-read it. It now holds the slot it landed on until the write settles,
sinking its lift as it does, while the source ghost fades out.
The confirmation moves from a full-width snackbar to a pill on the FAB's
band, the shape agendula uses for its undoable delete.