The order mutation and onReorder call sat after the 160 ms settle
animation inside the same cancellable coroutine; grabbing another row
within that window cancelled the job between animation and commit,
silently reverting a finished reorder. The commit now runs
synchronously in onDragEnd — the settle is purely visual (the live
offset is re-based onto the new slot in the same frame, so nothing
jumps) and safe to interrupt.
Also derive the hovered target slot via derivedStateOf so a drag only
recomposes the column when a slot boundary is crossed, not on every
pixel (the held row's own translation is already draw-phase).
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Jean-Luc Makiola
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