TaskTracker/WindowWatcher/Program.cs

using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using WindowWatcher;

var hostCts = new CancellationTokenSource();

var builder = Host.CreateApplicationBuilder(args);

builder.Services.Configure<WindowWatcherOptions>(
    builder.Configuration.GetSection(WindowWatcherOptions.SectionName));

builder.Services.AddHttpClient("TaskTrackerApi", (sp, client) =>
{
    var config = sp.GetRequiredService<Microsoft.Extensions.Options.IOptions<WindowWatcherOptions>>().Value;
    client.BaseAddress = new Uri(config.ApiBaseUrl);
});

builder.Services.AddHostedService<Worker>();

var host = builder.Build();

// Run the host in a background thread
var hostTask = Task.Run(() => host.RunAsync(hostCts.Token));

// Run WinForms tray icon on the main thread
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Application.Run(new TrayApplicationContext(hostCts));

// Wait for host to finish
await hostTask;