fix: 景区详情公告弹窗内容保留换行格式展示，正文固定高度45vh可滑动不被按钮遮盖

src/packages/content/pages/scenic-detail.vue

@@ -193,7 +193,25 @@ function fixRichHtml(html: string): string {
 
 const introductionHtml = computed(() => fixRichHtml(scenic.value.introduction))
 const bookingNoticeHtml = computed(() => fixRichHtml(scenic.value.bookingNoticeHtml))
-const storeNoticeHtml = computed(() => fixRichHtml(storeNotice.value.content))
+
+/** 富文本标签特征（管理端公告内容为 textarea 纯文本，含标签才视为 HTML） */
+// xuchao: 判断公告正文是否为编辑器产出的 HTML
+const HTML_TAG_RE = /<(?:p|br|div|span|strong|em|i|b|u|h[1-6]|img|ul|ol|li|a|table|tr|td|video|section)[^>]*>/i
+
+// xuchao: 纯文本转 rich-text 可渲染的 HTML：转义特殊字符 + 换行转 <br/>，保留后台录入的段落格式
+function plainTextToHtml(text: string): string {
+  return text
+    .replace(/&(?!(?:#\d+|#x[0-9a-fA-F]+|[a-zA-Z][a-zA-Z0-9]*);)/g, '&amp;')
+    .replace(/</g, '&lt;')
+    .replace(/>/g, '&gt;')
+    .replace(/\n/g, '<br/>')
+}
+
+const storeNoticeHtml = computed(() => {
+  const content = storeNotice.value.content
+  if (!content) return ''
+  return HTML_TAG_RE.test(content) ? fixRichHtml(content) : plainTextToHtml(content)
+})
 
 const activeTab = ref<'notice' | 'intro'>('notice')
 const currentSlide = ref(0)
@@ -862,13 +880,14 @@ $icon-crown: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' w
   text-align: center;
 }
 
+/* xuchao: 正文区固定 45vh 高度——微信要求 scroll-view 有确定高度才能竖向滚动；flex-shrink:0 防止被弹窗整体高度压缩 */
 .notice-popup-body {
+  height: 45vh;
+  flex-shrink: 0;
   padding: $spacing-3 $spacing-5 $spacing-3;
   font-size: $font-size-sm;
   color: $uv-tips-color;
   line-height: 1.9;
-  max-height: 45vh;
-  overflow-y: auto;
 }
 
 .notice-popup-footer {