style(theme): 客户端切换深色视觉风格

lib/pages/auth/phone_auth_sheet.dart

@@ -28,8 +28,8 @@ Future<bool?> showPhoneAuthSheet(BuildContext context, {bool signUp = false}) {
     context: context,
     isScrollControlled: true,
     useSafeArea: true,
-    backgroundColor: Colors.transparent,
-    barrierColor: Colors.black.withValues(alpha: 0.62),
+    backgroundColor: AppColors.transparent,
+    barrierColor: AppColors.mediaBlack.withValues(alpha: 0.62),
     builder: (_) => PhoneAuthSheet(initialSignUp: signUp),
   );
 }