feat(square): differentiate scroll behavior for xinghe/xingbang/guangchang tabs

frontend/pages/square/square.vue

@@ -45,7 +45,7 @@
     <!-- 内容区域 -->
     <scroll-view
       class="content-wrapper"
-      scroll-y
+      :scroll-y="activeContentTab === 'guangchang'"
       :show-scrollbar="false"
       :bounce="false"
       @scroll="onScroll"
@@ -92,7 +92,7 @@
 </template>
 
 <script setup>
-import { ref, onMounted, onUnmounted } from "vue";
+import { ref, watch, onMounted, onUnmounted } from "vue";
 import { onLoad, onShow } from "@dcloudio/uni-app";
 import { useStore } from "vuex";
 import Header from "../components/Header.vue";
@@ -121,6 +121,12 @@ const creationGridRef = ref(null);
 const cardTapTimers = {};
 const likingMap = ref({});
 
+// 切 tab 时重置外层 scroll-view 的 scrollTop,避免残留滚动位置
+watch(activeContentTab, () => {
+  // 星河/星榜 时 scroll-y=false,但 scrollTop 残留可能导致显示异常
+  uni.pageScrollTo({ scrollTop: 0, duration: 0 });
+});
+
 // 统一 scroll 处理：驱动 CreationGrid 切 fixed
 const onScroll = (e) => {
   const scrollTop = (e && e.detail && e.detail.scrollTop) || 0;
@@ -348,7 +354,8 @@ onUnmounted(() => {
 /* 热门分类区块 */
 .hot-category-wrapper {
   position: relative;
-  padding-bottom: 80rpx;
+  /* 100vh - header(208rpx) - banner(360rpx) - tabs(88rpx) = 可用 body 高度 */
+  height: calc(100vh - 208rpx - 360rpx - 88rpx);
 }
 
 /* 蒙层 */