reintroduce microsoft login. upgrade a bunch of stuff.

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

@@ -1,12 +1,10 @@
 namespace Shogi.UI.Pages.Home.Account
 {
-	public class User
-	{
-		public string Id { get; set; }
-		public string DisplayName { get; set; }
-
-		public WhichAccountPlatform WhichAccountPlatform { get; set; }
-
-		public Guid OneTimeSocketToken { get; set; }
-	}
+    public readonly record struct User(
+        string Id,
+        string DisplayName,
+        WhichAccountPlatform WhichAccountPlatform,
+        Guid OneTimeSocketToken)
+    {
+    }
 }