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Miguel Angel Simon Sierra
5ce362299c
The element stacking key (element.key ?? id) was recomputed in four places (reorder-intent generation, row ordering, the commit-time sibling lookup via a threaded keyOf param, and resolveTimelineMove). Any drift would silently break the sibling lookup and no-op the reorder. Route all of them through the existing getTimelineElementIdentity owner, share one toStackingOrderItem mapper between row ordering and reorder intent, and drop the keyOf parameter. Also enforce the audio side-effect invariant in the single mutation owner (applyTimelineStackingReorder): dragging an audio clip has no visual layer to restack, so it never writes z-index. Covered by a new hook test.