fix: pass layer split bounds to canvas overlay

components/canvas/nodes/ImageNode.tsx

@@ -1984,6 +1984,7 @@ export function ImageNode({ node, isSelected }: ImageNodeProps) {
             title: layer.title,
             layerIndex: layer.layerIndex,
             totalLayers: layer.totalLayers,
+            bounds: layer.bounds ?? null,
           }))
         );
         toast.success(`图层拆分完成，已新增 ${layers.length} 个图层结果`);