fix 初始化时主题背景色的显示问题

src/App.vue

@@ -1,10 +1,15 @@
 <script lang="ts" setup>
 import { useToast } from 'vue-toast-notification'
+import { useTheme } from 'vuetify'
 import api from './api'
 import type { User } from './api/types'
 import store from './store'
 import avatar1 from '@images/avatars/avatar-1.png'
 
+// 第一时间应用主题
+const { global: globalTheme } = useTheme()
+globalTheme.name.value = localStorage.getItem('theme') || 'light'
+
 // 提示框
 const $toast = useToast()