Canceling the nest/extract dialog restored the child's position but
left the parent card at its auto-grown size. growParentsToFitChildren
fires on drag-stop to fit a then-outside child; when the drag is
subsequently cancelled, the parent keeps that grown width/height
forever because the grow pass is grow-only.
Strip width/height from the ex-parent alongside the child position
restore in cancelNest — React Flow re-measures from CSS, parent
collapses back to its natural size. Same trick nestNode already
uses for the un-nest path.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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