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>