fix(RankingCard): 修复助力码视图被遮挡问题

 <!--
  * @Date: 2025-01-09 00:00:00
  * @LastEditors: hookehuyr hookehuyr@gmail.com
- * @LastEditTime: 2025-10-25 19:47:47
+ * @LastEditTime: 2025-10-25 20:00:46
  * @FilePath: /lls_program/src/components/RankingCard.vue
  * @Description: 排行榜卡片组件
 -->
@@ -43,7 +43,7 @@
       <!-- 排行榜日期 -->
       <view class="rank-date relative">
         <view class="flex items-center justify-center"><text class="mr-2">截止昨日</text>{{ currentDate }}<text v-if="activeTab !== 'shanghai'" class="ml-2">排名</text><IconFont name="ask" size="16" class="ml-2" @click="handleRankAskClick"></IconFont></view>
-        <view v-if="activeTab === 'support'" class="absolute font-bold text-white bg-orange-500 top-0 rounded-full px-4 py-1" style="right: 0rpx; top: 50rpx; font-size: 23rpx;" @tap="joinOrganization">助力码</view>
+        <view v-if="activeTab === 'support'" class="absolute font-bold text-white bg-orange-500 top-0 rounded-full px-4 py-1" style="right: 0rpx; top: 50rpx; font-size: 23rpx; z-index: 999;" @tap="joinOrganization">助力码</view>
       </view>
 
       <view v-if="activeTab === 'shanghai'" class="relative mb-2 text-white">