fix: login state refresh, hero layout, default avatar consistency

zhiyin-app/src/pages/user/user.vue

@@ -3,7 +3,7 @@
     <!-- 个人中心 -->
     <view class="header" v-if="isLoggedIn">
       <view class="profile-section">
-        <image class="avatar" :src="userInfo.avatar || '/static/avatar-default.svg'" mode="aspectFill" />
+        <image class="avatar" :src="userInfo.avatar || '/static/avatar-default.png'" mode="aspectFill" />
         <view class="profile-info">
           <text class="nickname">{{ userInfo.nickname || '未设置昵称' }}</text>
           <view class="plan-badge">{{ userInfo.plan || '免费版' }}</view>
@@ -33,7 +33,6 @@
         <view class="guest-avatar"><text class="guest-icon">👤</text></view>
         <view class="guest-info">
           <text class="guest-name">未登录 / 点击登录</text>
-          <text class="guest-hint">登录后体验全部功能</text>
         </view>
         <text class="header-arrow">›</text>
       </view>
@@ -84,6 +83,7 @@
 
 <script setup>
 import { ref, computed, onMounted } from 'vue'
+import { onShow } from '@dcloudio/uni-app'
 import { api } from '../../config'
 
 const userInfo = ref({})
@@ -93,13 +93,16 @@ const token = ref('')
 
 const isLoggedIn = computed(() => !!token.value)
 
-onMounted(() => {
+const refreshState = () => {
   token.value = uni.getStorageSync('token') || ''
   if (!token.value) return
   try { const s = uni.getStorageSync('userInfo'); if (s) userInfo.value = JSON.parse(s) } catch(e) {}
   loadStats()
   checkAdmin()
-})
+}
+
+onMounted(refreshState)
+onShow(refreshState)
 
 const loadStats = async () => {
   try {