feat: 优化部分问题，完善选区功能

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

@@ -475,7 +475,10 @@ export function cloneLayer(layer) {
 export function findLayerRecursively(layers, layerId, parent = null) {
   try {
     if (!layers || !Array.isArray(layers) || !layerId) {
-      return null;
+      return {
+        layer: null,
+        parent: null,
+      };
     }
 
     // 在当前图层列表中查找
@@ -499,11 +502,17 @@ export function findLayerRecursively(layers, layerId, parent = null) {
     }
   } catch (error) {
     console.error(`查找图层 ${layerId} 时出错:`, error);
-    return null;
+    return {
+      layer: null,
+      parent: null,
+    };
   }
 
   console.warn(`图层 ${layerId} 未找到`);
-  return null;
+  return {
+    layer: null,
+    parent: null,
+  };
 }
 
 /**