refactor(RankingCard): 优化地区榜单显示逻辑并移除冗余代码

移除根据用户区县自动设置默认标签的逻辑，简化地区榜单显示方式
修改默认激活标签为'shanghai'，直接显示区域名称而非固定文本

@@ -139,7 +139,7 @@ const handleItemClick = (item, index) => {
     const imageUrls = albumData.value
       .filter(media => media.media_type === 'IMAGE')
       .map(media => media.media_url);
-    
+
     Taro.previewImage({
       urls: imageUrls,
       current: item.media_url

@@ -137,7 +137,7 @@ const props = defineProps({
 })
 
 // 当前激活的tab
-const activeTab = ref('310101')
+const activeTab = ref('shanghai')
 
 // 内容切换状态
 const isContentSwitching = ref(false)
@@ -200,18 +200,6 @@ const loadLeaderboardData = async (isInitialLoad = false) => {
       leaderboardData.value = response.data
       // 设置当前日期
       currentDate.value = response.data.yesterday
-
-      // 只在初始加载时从current_family.county获取区县信息，设置默认tab
-      if (isInitialLoad && response.data.current_family) {
-        const currentFamilyCounty = response.data.current_family.county;
-        if (currentFamilyCounty && String(currentFamilyCounty) !== activeTab.value) {
-          // 只在county与当前activeTab不同时才设置，确保county字段为字符串格式
-          activeTab.value = String(currentFamilyCounty)
-          // 设置activeTab后需要重新加载数据以获取正确的区县排行榜
-          await loadLeaderboardData(false)
-          return
-        }
-      }
     }
   } catch (error) {
     console.error('获取排行榜数据失败:', error)
@@ -241,7 +229,7 @@ const availableRegions = computed(() => {
     { text: '地区', value: 'region' },
     { text: '助力', value: 'support' }
   ]
-  
+
   // 如果有用户区县信息，将地区榜的value设置为用户区县
   const currentFamilyCounty = leaderboardData.value?.current_family?.county
   if (currentFamilyCounty) {
@@ -251,7 +239,7 @@ const availableRegions = computed(() => {
       regions[1] = { text: userRegion.text, value: userCounty }
     }
   }
-  
+
   return regions
 })
 
@@ -265,10 +253,10 @@ const getTabDisplayName = (region) => {
     return '上海榜'
   } else if (region.value === 'support') {
     return '助力榜'
-  } else if (region.value === 'region' || region.text.includes('区') || region.text.includes('县')) {
-    return '地区榜'
+  } else {
+    // 直接显示区域名称，如"黄浦区"、"杨浦区"等
+    return region.text
   }
-  return region.text
 }
 
 /**
@@ -417,11 +405,11 @@ defineExpose({
       &.indicator-shanghai {
         transform: translateX(0%);
       }
-      
+
       &.indicator-region {
         transform: translateX(100%);
       }
-      
+
       &.indicator-support {
         transform: translateX(200%);
       }

 <!--
  * @Date: 2022-09-19 14:11:06
  * @LastEditors: hookehuyr hookehuyr@gmail.com
- * @LastEditTime: 2025-09-15 14:10:11
+ * @LastEditTime: 2025-09-15 15:21:47
  * @FilePath: /lls_program/src/pages/ActivitiesCover/index.vue
  * @Description: 活动海报页面 - 展示活动信息并处理定位授权
 -->
@@ -143,7 +143,7 @@ import { handleSharePageAuth, addShareFlag } from '@/utils/authRedirect'
 import { THEME_COLORS } from '@/utils/config';
 
 // 默认海报图
-const defaultPoster = 'https://cdn.ipadbiz.cn/lls_prog/images/welcome_5.jpg';
+const defaultPoster = 'https://cdn.ipadbiz.cn/lls_prog/images/welcome_6.png';
 /**
  * 活动海报页面组件
  * 功能：展示活动信息、处理定位授权、跳转到活动页面