Fix claims.

Use OID instead of email for microsoft identifier.
Fix PlayerCount route.
Add created date to user table.
Create spectator icon.

Shogi.Api/Extensions/ClaimsExtensions.cs

@@ -1,42 +1,30 @@
-using System.Security.Claims;
+using Microsoft.Identity.Web;
+using System.Security.Claims;
 
 namespace Shogi.Api.Extensions;
 
 public static class ClaimsExtensions
 {
-	private static readonly string MsalUsernameClaim = "preferred_username";
+    // https://learn.microsoft.com/en-us/azure/active-directory/develop/id-tokens#payload-claims
 
-	public static string? GetGuestUserId(this ClaimsPrincipal self)
-	{
-		return self.Claims.FirstOrDefault(c => c.Type == ClaimTypes.NameIdentifier)?.Value;
-	}
+    /// <summary>
+    /// Get Id from claims after applying shogi-specific claims transformations.
+    /// </summary>
+    public static string GetShogiUserId(this ClaimsPrincipal self)
+    {
+        var id = self.GetNameIdentifierId();
+        if (string.IsNullOrEmpty(id)) throw new InvalidOperationException("Shogi UserId not found in claims.");
+        return id;
+    }
 
-	public static string? DisplayName(this ClaimsPrincipal self)
-	{
-		return self.Claims.FirstOrDefault(c => c.Type == ClaimTypes.Name)?.Value;
-	}
+    /// <summary>
+    /// Get display name from claims after applying shogi-specific claims transformations.
+    /// </summary>
+    public static string GetShogiUserDisplayname(this ClaimsPrincipal self)
+    {
+        var displayName = self.Claims.FirstOrDefault(c => c.Type == ClaimTypes.Name)?.Value;
+        if (string.IsNullOrEmpty(displayName)) throw new InvalidOperationException("Shogi Display name not found in claims.");
+        return displayName;
+    }
 
-	public static bool IsMicrosoft(this ClaimsPrincipal self)
-	{
-		return self.HasClaim(c => c.Type == MsalUsernameClaim);
-	}
-
-	public static string? GetMicrosoftUserId(this ClaimsPrincipal self)
-	{
-		return self.Claims.FirstOrDefault(c => c.Type == MsalUsernameClaim)?.Value;
-	}
-
-	/// <summary>
-	/// Reads the userId from claims after claims transformation has occurred.
-	/// Throws if a shogi userid is not found.
-	/// </summary>
-	/// <exception cref="InvalidOperationException"></exception>
-	public static string GetShogiUserId(this ClaimsPrincipal self)
-	{
-		var id = self.IsMicrosoft() ? self.GetMicrosoftUserId() : self.GetGuestUserId();
-		
-		if (string.IsNullOrEmpty(id)) throw new InvalidOperationException("Shogi UserId not found in claims.");
-
-		return id;
-	}
 }