squash a bunch of commits

Shogi.UI/Pages/Home/Account/AccountState.cs

@@ -0,0 +1,28 @@
+namespace Shogi.UI.Pages.Home.Account;
+
+public class AccountState
+{
+	public event EventHandler<LoginEventArgs>? LoginChangedEvent;
+
+	private User? user;
+	public User? User
+	{
+		get => user;
+		set
+		{
+			if (user != value)
+			{
+				user = value;
+				EmitLoginChangedEvent();
+			}
+		}
+	}
+
+	private void EmitLoginChangedEvent()
+	{
+		LoginChangedEvent?.Invoke(this, new LoginEventArgs
+		{
+			User = User
+		});
+	}
+}