修复画布删除最后一个活动图层bug

src/component/Canvas/CanvasEditor/index.vue

@@ -678,12 +678,20 @@ function deleteFun(){
 
 function removeLayer(layerId) {
   // Check if this is the last layer - prevent deletion
-  if (layers.value.length <= 2) {
-    console.warn(
+	var isChild = false;
+	var parentLength = 0;
+	layers.value.forEach((layer) => {
+		if(layer.children.some(v => v.id == layerId)){
+			isChild = true;
+			parentLength = layer.children.length;
+		}
+	})
+	if(isChild && parentLength == 1 || layers.value.length <= 3){
+		console.warn(
       "Cannot delete the last layer. At least one layer must remain."
     );
     return;
-  }
+	}
 
   if (canvasManager && canvasManager.canvas) {
     const layerToRemove = layers.value.find((l) => l.id === layerId);