fix(about): copyright carries the year — © 2026 Llama Chile Shop

Derived from the clock rather than a literal, so a build shipped next year does not display a stale
date. The About test asserts the rendered string, year included.

ViewModels/MainViewModel.Overlays.cs

@@ -1,3 +1,4 @@
+using System;
 using System.Diagnostics;
 using System.IO;
 using System.Windows.Input;
@@ -46,6 +47,10 @@ public partial class MainViewModel : ViewModelBase
     public string PaidOfferText => "Unlocks 60 fps for streaming and recording.";
     public string TrustLine => "One-time purchase · lifetime licence · no account, no subscription, no tracking.";
 
+    /// <summary>Footer copyright. The year is the current one, not a hardcoded literal, so a build
+    /// shipped next year does not carry a stale date.</summary>
+    public string CopyrightLabel => $"© {DateTime.Now.Year} Llama Chile Shop";
+
     /// <summary>Shown instead of the price and CTA once ownership is verified: a paying customer is
     /// never sold to.</summary>
     public string LicenceStateLabel => IsAppOwned ? "Licence: owned via Steam — thank you." : string.Empty;