added notification system for file downloads and pair requests

LightlessSync/UI/Models/LightlessNotification.cs

@@ -0,0 +1,34 @@
+using Dalamud.Interface;
+using LightlessSync.LightlessConfiguration.Models;
+using System.Numerics;
+namespace LightlessSync.UI.Models;
+public class LightlessNotification
+{
+    public string Id { get; set; } = Guid.NewGuid().ToString();
+    public string Title { get; set; } = string.Empty;
+    public string Message { get; set; } = string.Empty;
+    public NotificationType Type { get; set; } = NotificationType.Info;
+    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+    public TimeSpan Duration { get; set; } = TimeSpan.FromSeconds(5);
+    public bool IsExpired => DateTime.UtcNow - CreatedAt > Duration;
+    public bool IsDismissed { get; set; } = false;
+    public List<LightlessNotificationAction> Actions { get; set; } = new();
+    public bool ShowProgress { get; set; } = false;
+    public float Progress { get; set; } = 0f;
+    public bool IsMinimized { get; set; } = false;
+
+    // Animation properties
+    public float AnimationProgress { get; set; } = 0f;
+    public bool IsAnimatingIn { get; set; } = true;
+    public bool IsAnimatingOut { get; set; } = false;
+}
+public class LightlessNotificationAction
+{
+    public string Id { get; set; } = Guid.NewGuid().ToString();
+    public string Label { get; set; } = string.Empty;
+    public FontAwesomeIcon Icon { get; set; } = FontAwesomeIcon.None;
+    public Vector4 Color { get; set; } = Vector4.One;
+    public Action<LightlessNotification> OnClick { get; set; } = _ => { };
+    public bool IsPrimary { get; set; } = false;
+    public bool IsDestructive { get; set; } = false;
+}