Fix slab material reload and wall curve step

packages/viewer/src/components/renderers/slab/slab-renderer.tsx

@@ -1,11 +1,11 @@
-import { type SlabNode, useRegistry } from '@pascal-app/core'
+import { getMaterialPresetByRef, type SlabNode, useRegistry } from '@pascal-app/core'
 import { useEffect, useMemo, useRef } from 'react'
 import * as THREE from 'three'
 import type { Mesh } from 'three'
 import { useNodeEvents } from '../../../hooks/use-node-events'
 import {
+  applyMaterialPresetToMaterials,
   createMaterial,
-  createMaterialFromPresetRef,
   DEFAULT_SLAB_MATERIAL,
 } from '../../../lib/materials'
 
@@ -17,9 +17,18 @@ export const SlabRenderer = ({ node }: { node: SlabNode }) => {
   const handlers = useNodeEvents(node, 'slab')
 
   const material = useMemo(() => {
-    const presetMaterial = createMaterialFromPresetRef(node.materialPreset)
-    const sourceMaterial = presetMaterial ?? (node.material ? createMaterial(node.material) : DEFAULT_SLAB_MATERIAL)
-    const slabMaterial = sourceMaterial.clone()
+    const preset = getMaterialPresetByRef(node.materialPreset)
+    const slabMaterial = preset
+      ? new THREE.MeshStandardMaterial()
+      : node.material
+        ? createMaterial(node.material).clone()
+        : DEFAULT_SLAB_MATERIAL.clone()
+
+    if (preset) {
+      // Apply the preset to the slab-owned material so async texture loads update
+      // the instance we actually render after refresh as well.
+      applyMaterialPresetToMaterials(slabMaterial, preset)
+    }
 
     // Slabs participate in the WebGPU MRT scene pass. Keeping them opaque avoids
     // pipeline variants that can fail when geometry is regenerated while a