New reviewTargeting.ts provides resolveReviewTargetAtPoint() which:
- descends into groups to find the deepest commentable child under the click
- walks children in z-order (front-to-back) for correct visual stacking
- handles nested groups recursively
- returns null if no valid child exists under the point
Editor.tsx review click handler now delegates to the resolver instead of
raw queryRegion + topmost-z pick. Defensive guard rejects group objectIds
before draft creation.
Existing group-anchored threads continue to render and open normally.
Hiren Kangad
ecd4408d8a