feat: 1.固定图层缩略图（完成）

2.工具栏新增插槽（完成）
3.loadJSON的元素顺序回发生错误

src/component/Canvas/CanvasEditor/utils/layerUtils.js

@@ -51,7 +51,6 @@ export function buildLayerAssociations(layer, canvasObjects) {
  */
 export function restoreObjectLayerAssociations(layers, canvasObjects) {
   if (!layers || !canvasObjects || !isArray(canvasObjects)) return;
-
   layers.forEach((layer) => {
     buildLayerAssociations(layer, canvasObjects);
     // 处理子图层
@@ -242,7 +241,11 @@ export function restoreLayers(simplifiedLayers, canvasObjects) {
       if (fabricObj) {
         fabricObj.layerId = layer.id;
         fabricObj.layerName = layer.name;
-        restoredLayer.fabricObject = fabricObj;
+        restoredLayer.fabricObject = fabricObj.toObject([
+          "id",
+          "layerId",
+          "type",
+        ]);
       } else {
         restoredLayer.fabricObject = null;
       }
@@ -258,7 +261,7 @@ export function restoreLayers(simplifiedLayers, canvasObjects) {
           if (fabricObj) {
             fabricObj.layerId = layer.id;
             fabricObj.layerName = layer.name;
-            return fabricObj;
+            return fabricObj.toObject(["id", "layerId", "type"]);
           }
           return null;
         })