feat(pc): 详情页增加吸顶返回列表按钮，首页按筛选签名恢复滚动位置

frontend/src/features/listings/views/ListingDetailView.vue

@@ -3,7 +3,8 @@ import { readError } from '@/shared/utils/error'
 import { ElMessage, ElMessageBox } from 'element-plus'
 import { computed, nextTick, onMounted, ref, watch } from 'vue'
 import { useRoute, useRouter } from 'vue-router'
-import { ShoppingCart, Star, StarFilled } from '@element-plus/icons-vue'
+import { ShoppingCart, Star, StarFilled, ArrowLeft } from '@element-plus/icons-vue'
+import { goBackOrHome } from '@/shared/utils/routerBack'
 
 import { fetchListing, type Listing } from '@/features/listings/api/listings'
 import { useListingCollections } from '@/features/listings/composables/useListingCollections'
@@ -345,6 +346,10 @@ function handleToggleFavorite() {
   const added = toggleFavorite(listing.value)
   ElMessage.success(added ? '已收藏账号' : '已取消收藏')
 }
+
+function goBack() {
+  goBackOrHome(router)
+}
 </script>
 
 <template>
@@ -353,6 +358,13 @@ function handleToggleFavorite() {
       <span>防骗提示：下单后请按平台交接流程确认收号与归还，不要私下交易。</span>
     </div>
 
+    <div class="detail-back-bar">
+      <button class="detail-back-btn" type="button" @click="goBack">
+        <el-icon><ArrowLeft /></el-icon>
+        <span>返回列表</span>
+      </button>
+    </div>
+
     <div v-if="listing" class="pc-detail-layout">
       <section class="pc-detail-main">
         <div class="detail-hero-card">
@@ -619,6 +631,44 @@ function handleToggleFavorite() {
 </template>
 
 <style scoped>
+.detail-back-bar {
+  /* 吸顶固定：始终显示在顶部导航栏（64px）下方，滚动时不跟随页面移走 */
+  position: sticky;
+  top: 78px;
+  z-index: 20;
+  display: flex;
+  align-items: center;
+  margin-bottom: 14px;
+}
+
+.detail-back-btn {
+  display: inline-flex;
+  align-items: center;
+  gap: 6px;
+  height: 36px;
+  padding: 0 14px;
+  border: 1px solid #eef1f5;
+  border-radius: 10px;
+  background: #ffffff;
+  color: #475569;
+  font-size: 13px;
+  font-weight: 700;
+  cursor: pointer;
+  box-shadow: 0 2px 8px rgba(23, 35, 61, 0.08);
+  transition:
+    border-color 0.2s ease,
+    color 0.2s ease,
+    background 0.2s ease,
+    box-shadow 0.2s ease;
+}
+
+.detail-back-btn:hover {
+  border-color: #ff6a00;
+  background: #fff7ed;
+  color: #ff6a00;
+  box-shadow: 0 4px 12px rgba(255, 106, 0, 0.12);
+}
+
 .pc-detail-layout {
   grid-template-columns: minmax(0, 1fr) 420px;
   align-items: start;