private async void CompletedAsync()
{
await Task.Run(() => { System.Threading.Thread.Sleep(1500); }); // ← 要調整（画面読み込み待機）
this.documentChanger();
this.frameReSize();
this.Resize += (sender, e) => this.frameReSize();
this.audio = new Audio();
this.audio.MuteChangedEvent += (mute) => this.Invoke(new Action<bool>(this.Audio_MuteChanged), mute);
this.LoginCompletedEvent?.Invoke(); // ← 読み込み完了通知は最後！！
}
public void Start()
{
this.login = LoginInfo.Load();
if (this.login.IsExists())
{
this.audio = null;
this.Navigate(GAME_URL);
}
}