Add ZLinq dependency and assembly attribute for collection type generation

src/PicView.Avalonia.MacOS/GlobalUsings.cs

@@ -1 +1,4 @@
-global using static PicView.Core.Config.SettingsManager;
+global using static PicView.Core.Config.SettingsManager;
+using ZLinq;
+
+[assembly: ZLinqDropIn("", DropInGenerateTypes.Collection)]

src/PicView.Avalonia/GlobalUsings.cs

@@ -1 +1,4 @@
-global using static PicView.Core.Config.SettingsManager;
+global using static PicView.Core.Config.SettingsManager;
+using ZLinq;
+
+[assembly: ZLinqDropIn("", DropInGenerateTypes.Collection)]