The confirmation pill is now floret-kit's SnackChip, shared with Agendula's
swipe-delete undo, wearing the FAB's colours and crossfading when its
message is answered.
Timed blocks are keyed by event and their bounds tweened, so a landing drop,
the neighbour that has to make room for it, and an undo all slide instead of
popping. The source ghost travels with them rather than fading out, and the
floating copy dissolves into the block once the grid has caught up.