fix(AdPage): 优化广告页面布局和样式

重构广告页面背景图片的实现方式，使用image标签替代view+backgroundImage
调整分享按钮位置从右上角改为左上角
修复排行榜卡片文字高度限制问题

 <!--
  * @Date: 2025-01-09 00:00:00
  * @LastEditors: hookehuyr hookehuyr@gmail.com
- * @LastEditTime: 2025-09-19 17:12:24
+ * @LastEditTime: 2025-09-19 17:26:08
  * @FilePath: /lls_program/src/components/RankingCard.vue
  * @Description: 排行榜卡片组件
 -->
@@ -600,7 +600,7 @@ defineExpose({
         -webkit-box-orient: vertical;
         white-space: normal;
         line-height: 1.2;
-        max-height: 52rpx;
+        max-height: 60rpx;
       }
 
       .leader-name {

 <!--
  * @Date: 2022-09-19 14:11:06
  * @LastEditors: hookehuyr hookehuyr@gmail.com
- * @LastEditTime: 2025-09-19 14:27:33
+ * @LastEditTime: 2025-09-19 17:28:31
  * @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
 -->

@@ -7,19 +7,20 @@
 }
 
 .ad-background {
-    width: 100%;
-    height: 100%;
-    background-size: cover;
-    background-position: center;
-    background-repeat: no-repeat;
-    position: relative;
-    cursor: pointer;
+    position: absolute;
+    top: 0;
+    left: 0;
+    width: 100vw;
+    height: 100vh;
+    object-fit: cover;
+    object-position: center;
+    z-index: 1;
 }
 
 .share-button-container {
     position: absolute;
     top: 30rpx;
-    right: 30rpx;
+    left: 30rpx;
     z-index: 10;
 }
 

@@ -8,20 +8,21 @@
 <template>
   <view class="ad-page">
     <!-- 背景图片 -->
-    <view
+    <image
+      :src="adImageUrl"
       class="ad-background"
-      :style="{ backgroundImage: adImageUrl ? `url(${adImageUrl})` : '' }"
+      mode="aspectFill"
       @tap="handleImageClick"
-    >
-      <!-- 右上角分享按钮 -->
-      <view class="share-button-container" @tap.stop>
-        <button 
-          class="share-button"
-          open-type="share"
-        >
-          推荐给朋友
-        </button>
-      </view>
+    />
+
+    <!-- 右上角分享按钮 -->
+    <view class="share-button-container" @tap.stop>
+      <button 
+        class="share-button"
+        open-type="share"
+      >
+        推荐给朋友
+      </button>
     </view>
 
     <!-- 加载状态 -->