Fix claims.

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

Shogi.UI/Pages/Home/GameBoard/GameBoardPresentation.razor

@@ -2,6 +2,16 @@
 @inject PromotePrompt PromotePrompt;
 
 <article class="game-board">
+    @if (IsSpectating)
+    {
+        <aside class="icons">
+            <div class="spectating" title="You are spectating.">
+                <svg width="32" height="32" fill="currentColor">
+                    <use xlink:href="css/bootstrap/bootstrap-icons.svg#camera-reels" />
+                </svg>
+            </div>
+        </aside>
+    }
     <!-- Game board -->
     <section class="board" data-perspective="@Perspective">
         @for (var rank = 1; rank < 10; rank++)
@@ -79,6 +89,7 @@
 </article>
 
 @code {
+    [Parameter] public bool IsSpectating { get; set; } = false;
     [Parameter] public WhichPlayer Perspective { get; set; }
     [Parameter] public Session? Session { get; set; }
     [Parameter] public string? SelectedPosition { get; set; }