Add split

src/components/PreviewStep.tsx

@@ -33,8 +33,15 @@ interface BinMeshProps {
 
 const BinMesh: React.FC<BinMeshProps> = ({ part, thickness, cornerRadius, isSelected, onClick }) => {
   const geometry = useMemo(() => {
-    return createBinGeometry(part.width, part.depth, part.height, thickness, cornerRadius);
-  }, [part, thickness, cornerRadius]);
+    return createBinGeometry(
+        part.width, 
+        part.depth, 
+        part.height, 
+        thickness, 
+        cornerRadius, 
+        part.internalPartitions // <--- ВАЖНО: передаем перегородки
+    );
+}, [part, thickness, cornerRadius]);
 
   const edgesGeometry = useMemo(() => {
      return new THREE.EdgesGeometry(geometry, 20);