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/HomeView.vue

@@ -1,6 +1,6 @@
 <script setup lang="ts">
 import { computed, ref, watch } from 'vue'
-import { RouterLink, useRoute, useRouter } from 'vue-router'
+import { RouterLink, onBeforeRouteLeave, useRoute, useRouter } from 'vue-router'
 import {
   defaultAWRecycleConfig,
   defaultHomeAnnouncements,
@@ -164,6 +164,7 @@ async function loadHome() {
     publishOptions.value = emptyListingPublishOptions
   } finally {
     loading.value = false
+    restorePcHomeScroll()
   }
 }
 
@@ -268,6 +269,63 @@ function buildDesktopHomeQueryValues(): Record<string, HomeQueryValue> {
   }
 }
 
+// ========== PC 首页滚动位置持久化 ==========
+// 详情页返回/浏览器后退时，首页列表异步加载导致页面高度不足，
+// vue-router 的 savedPosition 恢复会被浏览器钳制到错误位置，
+// 因此按「筛选签名」显式保存/恢复滚动位置，确保回到上次筛选的位置。
+const pcHomeScrollStorageKey = 'hfb.home.scroll.desktop'
+
+function savePcHomeScroll() {
+  try {
+    window.sessionStorage.setItem(
+      pcHomeScrollStorageKey,
+      JSON.stringify({ signature: desktopHomeStateSignature(), top: window.scrollY })
+    )
+  } catch {
+    // sessionStorage 不可用时忽略，仅损失滚动恢复
+  }
+}
+
+function restorePcHomeScroll() {
+  let savedTop = 0
+  let savedSignature = ''
+  try {
+    const raw = window.sessionStorage.getItem(pcHomeScrollStorageKey)
+    if (raw) {
+      const parsed = JSON.parse(raw) as { signature?: string; top?: number }
+      if (typeof parsed.signature === 'string' && typeof parsed.top === 'number') {
+        savedSignature = parsed.signature
+        savedTop = parsed.top
+      }
+    }
+  } catch {
+    return
+  }
+  // 仅当返回时的筛选条件与离开时一致才恢复，避免把滚动带到别的筛选结果上
+  if (savedTop <= 0 || savedSignature !== desktopHomeStateSignature()) return
+
+  let attempts = 0
+  const apply = () => {
+    const maxTop = Math.max(0, document.documentElement.scrollHeight - window.innerHeight)
+    if (savedTop <= maxTop) {
+      window.scrollTo({ top: savedTop })
+      return
+    }
+    // 首页无限滚动分页：已渲染高度不足时继续加载一页后重试，尽量恢复到位
+    if (attempts < 5 && hasMoreListings.value && !loadingMore.value) {
+      attempts += 1
+      void loadListingsPage(false).then(() => requestAnimationFrame(apply))
+    } else {
+      window.scrollTo({ top: maxTop })
+    }
+  }
+  requestAnimationFrame(apply)
+}
+
+onBeforeRouteLeave(() => {
+  savePcHomeScroll()
+})
+
 syncHomeQuery()
 loadHome()
 </script>

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;

frontend/src/features/mohong/views/MohongDetailView.vue

@@ -2,6 +2,8 @@
 import { computed, onMounted, ref } from 'vue'
 import { useRoute, useRouter } from 'vue-router'
 import { ElMessage } from 'element-plus'
+import { ArrowLeft } from '@element-plus/icons-vue'
+import { goBackOrHome } from '@/shared/utils/routerBack'
 import {
   createMohongOrder,
   fetchMohongProduct,
@@ -69,6 +71,10 @@ const activePayWayLabel = computed(() => {
 
 onMounted(loadProduct)
 
+function goBack() {
+  goBackOrHome(router)
+}
+
 async function loadProduct() {
   loading.value = true
   try {
@@ -162,6 +168,12 @@ async function handleBuy() {
 
 <template>
   <section v-loading="loading" class="mohong-detail-page">
+    <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>
     <template v-if="product">
       <div class="detail-layout">
         <div class="gallery-panel">
@@ -307,6 +319,44 @@ async function handleBuy() {
   width: 100%;
 }
 
+.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);
+}
+
 .detail-layout {
   display: grid;
   /* 左图固定合理宽度，右侧信息铺满剩余空间，避免整页右侧大片空白 */

frontend/src/shared/utils/routerBack.ts

@@ -0,0 +1,16 @@
+import type { Router } from 'vue-router'
+
+/**
+ * 返回上一个站内页面（保留其 URL query，即筛选条件），
+ * 若没有站内历史（例如直接粘贴链接打开详情页），则回首页。
+ * vue-router 在 push 时会往 history.state 写入 back 字段记录来源页，
+ * 且该字段始终是站内路径（外部来源时首次进入为 null），可安全判断。
+ */
+export function goBackOrHome(router: Router) {
+  const state = window.history.state as { back?: string | null } | null
+  if (state?.back) {
+    router.back()
+    return
+  }
+  void router.push('/')
+}