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Lattice.Core/Services/NotificationService.cs

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+using Lattice.Core.Abstractions;
+using Lattice.Core.Models;
+using Lattice.Core.Models.Enums;
+
+namespace Lattice.Core.Services;
+
+/// <summary>
+/// Простая реализация сервиса уведомлений.
+/// Хранит только событие и вызывает его при Show().
+/// </summary>
+public sealed class NotificationService : INotificationService
+{
+    public event EventHandler<NotificationEventArgs>? NotificationReceived;
+
+    public void Show(string message, NotificationSeverity severity = NotificationSeverity.Info, int durationSeconds = 5)
+    {
+        NotificationReceived?.Invoke(this, new NotificationEventArgs(message, severity, durationSeconds));
+    }
+}