Two follow-up fixes after the FloorElevationSystem landed: - `viewer/src/components/viewer/index.tsx`: the auto-format hook stripped the `FloorElevationSystem` import a second time, leaving the JSX mount unresolved. - `packages/nodes/src/column/definition.ts`: column stores Y rotation as a scalar `number`, but `floorPlaced.footprint` types the rotation field as the full Euler tuple. Wrap as `[0, column.rotation, 0]`. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>