Templates mark visual edge slots with data-cms-slot/-parent. The drag
engine now resolves those zones first (slot-scoped index, acceptsSlot
filter), sorts within the dragged block's own slot, and the overlay
shows a slot add-button so empty zones are discoverable. dnd unit
tests cover slot hit/index/refusal/same-slot sort.
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Co-Authored-By: Codebuff <noreply@codebuff.com>
mats
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