fix some issues and add test Blazor frontend

ColorControl.UI/Program.cs

@@ -0,0 +1,32 @@
+//using ColorControl.UI;
+
+//Blazor.Start();
+
+//var builder = WebApplication.CreateBuilder(args);
+
+//// Add services to the container.
+//builder.Services.AddRazorComponents()
+//    .AddInteractiveServerComponents();
+
+//builder.Services.AddSingleton<AppState>();
+//builder.Services.AddSingleton<OptionsService>();
+
+//var app = builder.Build();
+
+//// Configure the HTTP request pipeline.
+//if (!app.Environment.IsDevelopment())
+//{
+//    app.UseExceptionHandler("/Error", createScopeForErrors: true);
+//    // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
+//    app.UseHsts();
+//}
+
+//app.UseHttpsRedirection();
+
+//app.UseStaticFiles();
+//app.UseAntiforgery();
+
+//app.MapRazorComponents<App>()
+//    .AddInteractiveServerRenderMode();
+
+//app.Run();