feat(paint-slots): recurate material catalog into families + expand colors

- Replace location-based categories (wood/flooring/roof/other) with material
  families: colors, wood, stone, brick, tile, concrete, metal, fabric, leather,
  roofing, ground, glass
- Add MaterialSurface tags (floor/wall/ceiling/roof/furniture/outdoor); retag all
  65 existing finishes; ids unchanged so library refs keep resolving
- Expand curated colors 15 -> 45, ordered by hue; unify on catalog library items
  and retire CURATED_COLORS (picker reads the colors family)
- Paint picker: wrapping rounded category chips (was horizontal scroll), empty
  families auto-hide, preset-style swatch cards (name label, selection-only ring,
  hover bg + SFX)

Phase 4 (finish-library content) of editor-paint-slots.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

packages/core/src/index.ts

@@ -102,9 +102,11 @@ export {
   LIBRARY_MATERIAL_REF_PREFIX,
   MATERIAL_CATALOG,
   MATERIAL_CATEGORIES,
+  MATERIAL_SURFACES,
   type MaterialCatalogItem,
   type MaterialCategory,
   type MaterialRef,
+  type MaterialSurface,
   type ParsedMaterialRef,
   parseMaterialRef,
   SCENE_MATERIAL_REF_PREFIX,