xfy acd6ff5236 Lock rowHeightPx during collapse animation
Add lockedRowHeightPx state that is only updated when fully expanded
(p < 0.01f). During collapse, rowHeightPx uses the locked value instead
of recalculating from the shrinking container height, which was causing
rowH to drop from 137→0 and gridH to become 0 at p=1.0.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
2026-05-15 00:15:21 +08:00
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