made the changes for the avalonia version

Author: GabrielDuf

src/UniGetUI.Avalonia/Views/SoftwarePages/AbstractPackagesPage.axaml.cs

@@ -1,5 +1,6 @@
 using Avalonia;
 using Avalonia.Controls;
+using Avalonia.Threading;
 using Avalonia.Controls.ApplicationLifetimes;
 using Avalonia.Input;
 using Avalonia.Input.Platform;
@@ -86,7 +87,13 @@ or nameof(PackagesPageViewModel.SortAscending))
     // ─── UI-only: focus the package list ─────────────────────────────────────
     private void OnFocusListRequested() => PackageList.Focus();
 
-    public void FocusPackageList() => ViewModel.RequestFocusList();
+    public void FocusPackageList()
+    {
+        if (ViewModel.MegaQueryBoxEnabled)
+            Dispatcher.UIThread.Post(() => MegaQueryBlock.Focus(), DispatcherPriority.Background);
+        else
+            ViewModel.RequestFocusList();
+    }
     public void FilterPackages() => ViewModel.FilterPackages();
 
     // ─── Abstract: let concrete pages add toolbar items ───────────────────────