fix extra rebuild

apps/editor/components/editor/index.tsx

@@ -28,7 +28,7 @@ export default function Editor() {
       <ActionMenu />
       <PanelManager />
 
-      <SidebarProvider className="fixed z-100">
+      <SidebarProvider className="fixed z-20">
         <AppSidebar />
       </SidebarProvider>
       <Viewer selectionManager="custom">

apps/editor/components/ui/panels/item-panel.tsx

@@ -29,7 +29,9 @@ export function ItemPanel() {
 
       // Mark parent wall as dirty if item is attached to wall
       if (node.asset.attachTo === 'wall' && node.parentId) {
-        useScene.getState().dirtyNodes.add(node.parentId as AnyNode['id'])
+        requestAnimationFrame(() => {
+          useScene.getState().dirtyNodes.add(node.parentId as AnyNode['id'])
+        })
       }
     },
     [selectedId, node, updateNode],

apps/editor/components/ui/primitives/number-input.tsx

@@ -64,8 +64,13 @@ export function NumberInput({
 
         const deltaValue = deltaX * step
         const newValue = clamp(startValueRef.current + deltaValue)
-        finalValue = Number.parseFloat(newValue.toFixed(precision))
-        onChange(finalValue)
+        const newFinalValue = Number.parseFloat(newValue.toFixed(precision))
+
+        // Only call onChange if value actually changed (avoid extra processing on tiny moves)
+        if (newFinalValue !== finalValue) {
+          finalValue = newFinalValue
+          onChange(finalValue)
+        }
       }
 
       const handleMouseUp = () => {

apps/editor/components/ui/sidebar/panels/site-panel/index.tsx

@@ -345,6 +345,7 @@ function LevelsSection() {
   const nodes = useScene((state) => state.nodes);
   const createNode = useScene((state) => state.createNode);
   const updateNode = useScene((state) => state.updateNode);
+  const deleteNode = useScene((state) => state.deleteNode);
   const selectedBuildingId = useViewer((state) => state.selection.buildingId);
   const selectedLevelId = useViewer((state) => state.selection.levelId);
   const setSelection = useViewer((state) => state.setSelection);
@@ -493,6 +494,15 @@ function LevelsSection() {
                 >
                   References
                 </button>
+                {level.level !== 0 && (
+                  <button
+                    className="flex items-center gap-2 w-full px-3 py-1.5 rounded text-sm hover:bg-accent hover:text-red-600 cursor-pointer"
+                    onClick={() => deleteNode(level.id)}
+                  >
+                    <Trash2 className="w-3.5 h-3.5" />
+                    Delete
+                  </button>
+                )}
               </PopoverContent>
             </Popover>
           </div>