Enable New UI by default (#1460)

* Enable New UI by default

* nit

* Add playwright test

* nit

* nit

* nit

src/i18n.ts

@@ -2,6 +2,8 @@ import { createI18n } from 'vue-i18n'
 
 const messages = {
   en: {
+    firstTimeUIMessage:
+      'This is the first time you use the new UI. Choose "Menu > Use New Menu > Disabled" to restore the old UI.',
     download: 'Download',
     loadAllFolders: 'Load All Folders',
     refresh: 'Refresh',
@@ -119,6 +121,8 @@ const messages = {
     }
   },
   zh: {
+    firstTimeUIMessage:
+      '这是您第一次使用新界面。选择“Menu > Use New Menu > Disabled”以恢复旧界面。',
     download: '下载',
     loadAllFolders: '加载所有文件夹',
     refresh: '刷新',