style(ui): 统一添加参观者按钮的样式

为保持UI一致性，将两个页面中的"添加参观者"按钮样式统一调整为flex布局并居中显示，同时为图标添加右边距

 <!--
  * @Date: 2024-01-15 16:25:51
  * @LastEditors: hookehuyr hookehuyr@gmail.com
- * @LastEditTime: 2026-01-16 20:09:30
+ * @LastEditTime: 2026-01-16 20:38:48
  * @FilePath: /xyxBooking-weapp/src/pages/submit/index.vue
  * @Description: 预约人员信息
 -->
@@ -15,8 +15,8 @@
       </view>
     </view>
     <view @tap="goToVisitor" class="add-visitors">
-      <view>
-        <IconFont name="plus" /> 添加参观者
+      <view class="flex items-center justify-center">
+        <IconFont name="plus" class="mr-1" /> 添加参观者
       </view>
     </view>
     <view v-if="visitorList.length" class="visitors-list">

@@ -5,7 +5,9 @@
         <view class="text">参观者信息</view>
       </view>
       <view @tap="() => { go('/pages/addVisitor/index') }" class="add-visitors">
-        <view class="add-btn"><IconFont name="plus" /> 添加参观者</view>
+        <view class="add-btn flex items-center justify-center">
+          <IconFont name="plus" class="mr-1" /> 添加参观者
+        </view>
       </view>
       <view v-if="visitorList.length" class="visitors-list">
         <view v-for="(item, index) in visitorList" :key="index" class="visitor-item">