Fix movement-hall black walls and column clipping.

Cap shared hall lights (no per-painting spots) so MeshStandard walls stay within WebGL limits, tuck classical/neoclassical details into engaged corner pilasters, and document the light budget.

Co-authored-by: Cursor <cursoragent@cursor.com>

client/src/hooks/useTexturedMaterial.ts

@@ -22,7 +22,8 @@ export function useTexturedMaterial(
       color: tint,
       roughness: surf.roughness,
       metalness: surf.metalness,
-      envMapIntensity: kind.startsWith('painted-') ? 0.45 : 0.65,
+      // Keep walls readable without HDR Environment IBL (CDN may be slow/offline).
+      envMapIntensity: kind.startsWith('painted-') ? 0.2 : 0.3,
     });
   }, [kind, tint, spanW, spanH]);