Replace custom socket implementation with SignalR.

Replace MSAL and custom cookie auth with Microsoft.Identity.EntityFramework
Also some UI redesign to accommodate different login experience.

Shogi.UI/Pages/Play/GameBrowser.razor

@@ -0,0 +1,59 @@
+@using Shogi.Contracts.Types;
+@using System.ComponentModel.DataAnnotations;
+@using System.Net;
+@using System.Text.Json;
+
+@inject ShogiApi ShogiApi
+
+<section class="GameBrowser PrimaryTheme ThemeVariant--Contrast">
+	<div class="table">
+		<row class="header">
+			<span>Creator</span>
+			<span>Seats</span>
+		</row>
+		<hr />
+		<AuthorizeView>
+			@foreach (var session in allSessions)
+			{
+					<row>
+						<div>
+							<a href="/play/@session.SessionId">@session.Player1</a>
+						</div>
+					@if (string.IsNullOrEmpty(session.Player2))
+					{
+								<span>1 / 2</span>
+					}
+					else
+					{
+								<span>Full</span>
+					}
+					</row>
+			}
+		</AuthorizeView>
+	</div>
+
+	@if (allSessions.Length == 0)
+	{
+			<p>There are no games being played.</p>
+	}
+</section>
+
+@code {
+	private SessionMetadata[] allSessions = Array.Empty<SessionMetadata>();
+	private SessionMetadata? activeSession;
+
+	protected override Task OnInitializedAsync()
+	{
+		return FetchSessions();
+	}
+
+	async Task FetchSessions()
+	{
+		var sessions = await ShogiApi.GetAllSessionsMetadata();
+		if (sessions != null)
+		{
+			this.allSessions = sessions.ToArray();
+			StateHasChanged();
+		}
+	}
+}