Each category group had its own isolated DndContext, so dnd-kit had no way
to resolve a drop that landed in a different group — cross-category drags
were silently no-ops by construction, not an edge-case bug.
Lifted to a single DndContext wrapping all groups, with one handleDragEnd
that looks up both the dragged item's and the drop target's current group
from live state: same group reorders as before, different group changes
the item's aisle (appended after the item it was dropped on) via the
existing changeCategory persistence path.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Arnaud
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