Replace custom close button in GlobalPromptModal with Ant Design's CloseOutlined icon for improved consistency and user experience. Simplify the onClose functionality while maintaining existing styles.

Cunkebao/src/pages/mobile/workspace/ai-knowledge/list/components/GlobalPromptModal.tsx

@@ -6,6 +6,7 @@ import {
   InfoCircleOutlined,
   ExclamationCircleFilled,
   InfoCircleFilled,
+  CloseOutlined,
 } from "@ant-design/icons";
 import { initGlobalPrompt, saveGlobalPrompt } from "../api";
 import style from "../index.module.scss";
@@ -103,17 +104,8 @@ const GlobalPromptModal: React.FC<GlobalPromptModalProps> = ({
           />
           <span>统一提示词配置</span>
         </div>
-        <span
-          onClick={onClose}
-          style={{
-            fontSize: 22,
-            color: "#999",
-            cursor: "pointer",
-            transition: "color 0.15s",
-          }}
-        >
-          ×
-        </span>
+
+        <CloseOutlined onClick={onClose} />
       </div>
       <div className={style.promptContent}>
         <div style={{ fontSize: 13, color: "#888", marginBottom: 12 }}>