User pointed at the palette's PNG icons in the bottom toolbar — they
expected the inspector title to use the same artwork, not the iconify
lucide glyphs. Different visual style.
- IconRef gains `{ kind: 'url'; src: string }`. Plain `<img>` render
in ParametricInspector (no next/image — the inspector is
`'use client'`).
- All currently-registered kinds switched to URL refs matching their
palette `iconSrc`:
fence → /icons/fence.png
slab → /icons/floor.png
ceiling → /icons/ceiling.png
wall → /icons/wall.png
spawn → /icons/site.png
shelf → /icons/column.png (placeholder, same as palette)
- Kind-owned panels (slab/ceiling) already pass URL strings to their
own PanelWrapper; unchanged.
Door/window/item will get URL refs when they register at Stage A.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
