Schema v2 adds style/rows/columns/withBack/withSides/withBottom/bracketStyle
and a `children: ItemNode[]` field for item hosting. Schema-level defaults
preserve the v1 wall-shelf visual so existing scenes load unchanged; the
placement tool spreads `shelfDefinition.defaults()` for fresh shelves
(cubby 3x2 at 1m × 0.5m × 1.8m, thickness 0.05m, back/sides/bottom on).
Four style geometries (wall-shelf / bookshelf / open-rack / cubby) share
the dimensional schema. `shelfRowSurfaceYs` exposes one host surface per
row, plus the bottom-board top when `withBottom` is on for cubby /
bookshelf.
Material is a single paintable surface (same shape walls / slabs / stairs
use); `DEFAULT_SHELF_MATERIAL` aligned with `DEFAULT_WALL_MATERIAL` so
unpainted shelves read as the canonical off-white.
Preview clones each cached material before mutating `transparent / opacity`
on the ghost — without the clone the mutation leaked into the cached
`getShelfMaterial` instance every committed shelf was using, rendering
them all see-through after the first placement preview rendered.
Store hardening: `migrateNodes` patches missing `children: []` on v1
shelves, and `updateNodesAction` reparenting tolerates a missing children
array on the new parent. `MaterialTarget` enum adds `'shelf'` so paint
mode picks up the kind.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
* Add catalog-based material presets across structural nodes
* Fix material picker fallback and wall visible highlights
* Preserve wall materials in selection highlights
- Add MaterialSchema with 10 presets (white, brick, concrete, wood, glass, metal, plaster, tile, marble, custom)
- Add material field to Wall, Slab, Door, Window, Ceiling, Roof, RoofSegment nodes
- Create MaterialPicker UI component with preset selection and custom properties
- Update all renderers to support material rendering with caching
- Add Material section to all node panels (WallPanel, SlabPanel, DoorPanel, WindowPanel, CeilingPanel, RoofPanel, RoofSegmentPanel)
- Update AGENTS.md with Material System documentation
