Refactor frontend entry to login and play routes

RpgRoller/Components/Pages/PlayPage.razor.cs

@@ -0,0 +1,29 @@
+using System.Diagnostics.CodeAnalysis;
+using Microsoft.AspNetCore.Components;
+using Microsoft.AspNetCore.WebUtilities;
+
+namespace RpgRoller.Components.Pages;
+
+[ExcludeFromCodeCoverage]
+public partial class PlayPage
+{
+    private Task OnLoggedOutAsync(string? message)
+    {
+        if (string.IsNullOrWhiteSpace(message))
+        {
+            Navigation.NavigateTo("/login", forceLoad: true);
+            return Task.CompletedTask;
+        }
+
+        var query = new Dictionary<string, string?>
+        {
+            ["message"] = message,
+            ["kind"] = message.Contains("expired", StringComparison.OrdinalIgnoreCase) ? "error" : "success"
+        };
+
+        Navigation.NavigateTo(QueryHelpers.AddQueryString("/login", query), forceLoad: true);
+        return Task.CompletedTask;
+    }
+
+    [Inject] private NavigationManager Navigation { get; set; } = null!;
+}