style(productDetail): 优化微信弹框样式和按钮颜色

移除多余的内联样式，使用预设颜色变量
简化弹框内容布局

 <!--
  * @Date: 2022-09-19 14:11:06
  * @LastEditors: hookehuyr hookehuyr@gmail.com
- * @LastEditTime: 2025-07-07 15:24:05
+ * @LastEditTime: 2025-07-07 15:51:00
  * @FilePath: /jgdl/src/pages/productDetail/index.vue
  * @Description: 商品详情页
 -->
@@ -180,11 +180,10 @@
 
         <!-- 微信号弹框 -->
         <nut-dialog v-model:visible="showWechat" title="卖家微信号" :close-on-click-overlay="true" :no-footer="true">
-            <view class="text-center p-4">
-                <text class="text-lg font-medium block mb-2">{{ product.seller.wechat }}</text>
+            <view class="text-center">
+                <text class="text-lg font-medium block mb-4">{{ product.seller.wechat }}</text>
                 <!-- <text class="text-sm text-gray-500 block mb-4">长按复制微信号</text> -->
-                <nut-button @click="copyWechat" type="primary" size="small"
-                    style="background-color: #f97316; border-color: #f97316;">
+                <nut-button @click="copyWechat" type="primary" color="orange">
                     复制微信号
                 </nut-button>
             </view>