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/canvasFactory.js

@@ -12,6 +12,8 @@ export const createCanvas = (elementId, options = {}) => {
     enableRetinaScaling: true,
     preserveObjectStacking: true, // 保持对象堆叠顺序
     // skipOffscreen: true, // 跳过离屏渲染
+    imageSmoothingEnabled: true, // 启用图像平滑 - 抗锯齿
+    imageSmoothingQuality: "high", // 设置高质量图像平滑
     ...options,
   });
 
@@ -24,6 +26,9 @@ export const createCanvas = (elementId, options = {}) => {
 export const createStaticCanvas = (elementId, options = {}) => {
   const canvas = new fabric.StaticCanvas(elementId, {
     enableRetinaScaling: canvasConfig.enableRetinaScaling,
+    imageSmoothingEnabled: true, // 启用图像平滑 - 抗锯齿
+    imageSmoothingQuality: "high", // 设置高质量图像平滑
+    skipOffscreen: false, // 不跳过离屏渲染
     ...options,
   });