8aa91fc27b60f42db5892dca0c1568ba6d03b469
addTrackGroup takes an optional anchorTrackId and inserts directly above it in trackOrder; anchors nested inside another group resolve to their parent's slot. The timeline's group-add button forwards selectedLayerId so the new group lands where the user is working instead of always jumping to the top. Covered by store + UI tests. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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