style(theme): 客户端切换深色视觉风格

lib/pages/auth/auth_view.dart

@@ -258,7 +258,7 @@ class _AuthPageState extends State<AuthPage> {
   Widget build(BuildContext context) {
     final l10n = AppLocalizations.of(context)!;
     return Theme(
-      data: AppTheme.light(),
+      data: AppTheme.dark(),
       child: Scaffold(
         resizeToAvoidBottomInset: false,
         backgroundColor: AppColors.ink,