The grid only appeared while a ghost was in flight (moving node / placing scope /
armed GLB item), so a merely-armed draft tool (wall / slab / fence / ceiling /
zone / column / MEP) showed no lattice. Gate visibility on isGridSnapActive()
alone — it already derives the snap context from the interaction scope OR the
armed build tool and is true only when that context resolves to grid (false for
select / idle / paint / lines / off), so it is exactly the right condition.
Draft tools publish no surface; the grid's horizontal branch already falls back
to the active level floor, with the reveal patch following the cursor.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
