feat: manually mirror opencoze's code from bytedance

Change-Id: I09a73aadda978ad9511264a756b2ce51f5761adf

frontend/packages/common/chat-area/text-grab/src/utils/find-picture-valid-child-node.ts

@@ -0,0 +1,27 @@
+/*
+ * Copyright 2025 coze-dev Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+ 
+import { getPictureNodeUrl } from './get-picture-node-url';
+
+/**
+ * 获取 TagName 为 Picture 的节点的有效节点
+ * @param childNodes NodeListOf<Node> 子节点列表
+ * @returns Node | null
+ */
+export const findPictureValidChildNode = (childNodes: NodeListOf<Node>) =>
+  Array.from(childNodes)
+    .filter(node => getPictureNodeUrl(node))
+    .at(0);