feat(首页): 添加首页分享功能

启用页面分享配置，自定义分享标题优先使用首页内容标题或默认值「觉林寺」，使用首个顶部横幅图片作为分享封面，并为分享路径添加分享标记

@@ -6,5 +6,6 @@
  * @Description: 首页配置
  */
 export default {
-  navigationBarTitleText: '首页'
+  navigationBarTitleText: '首页',
+  enableShareAppMessage: true,
 }

@@ -76,11 +76,12 @@
 
 <script setup>
 import { computed, ref } from 'vue'
-import Taro, { useLoad } from '@tarojs/taro'
+import Taro, { useLoad, useShareAppMessage } from '@tarojs/taro'
 import AppTabbar from '@/components/AppTabbar.vue'
 import { getHomeContentAPI } from '@/api'
 import { buildWebviewPreviewUrl } from '@/utils/webview'
 import { isMockEnabled } from '@/utils/config'
+import { addShareFlag } from '@/utils/authRedirect'
 
 const defaultIcon = 'icon-jingxiuying'
 const homeContent = ref({
@@ -97,6 +98,11 @@ const homeIcons = computed(() => homeContent.value.volunteer_home_icon || [])
 const hasTopBanner = computed(() => topBanners.value.some((item) => item?.image_url))
 const shouldUseTopBannerSwiper = computed(() => topBanners.value.filter((item) => item?.image_url).length > 1)
 const isMockHomeData = computed(() => isMockEnabled())
+const shareTitle = computed(() => String(homeContent.value?.title || '').trim() || '觉林寺')
+const shareImageUrl = computed(() => {
+  const firstBanner = topBanners.value.find((item) => item?.image_url)
+  return firstBanner?.image_url || ''
+})
 
 const getItemTargetUrl = (item) => String(item?.target_url || '').trim()
 
@@ -169,6 +175,19 @@ const fetchHomeContent = async () => {
 useLoad(() => {
   fetchHomeContent()
 })
+
+useShareAppMessage(() => {
+  const shareOptions = {
+    title: shareTitle.value,
+    path: addShareFlag('pages/index/index'),
+  }
+
+  if (shareImageUrl.value) {
+    shareOptions.imageUrl = shareImageUrl.value
+  }
+
+  return shareOptions
+})
 </script>
 
 <style lang="less">