import 'package:package_info_plus/package_info_plus.dart';

String? _cached;

/// 当前 App 版本号（一次获取后缓存，用于登录页/首页底部展示）
Future<String> appVersion() async {
  if (_cached != null) return _cached!;
  final info = await PackageInfo.fromPlatform();
  _cached = info.version;
  return _cached!;
}