fix: prevent segfault in status_handler when downloading a game

Issue: #686

Author: moormaster

src/ui/views/GamesView/grid/GameCard.vala

@@ -310,7 +310,8 @@ namespace GameHub.UI.Views.GamesView.Grid
 			_visible_game = vg;
 
 			Idle.add(() => {
-				label.label = game.name;
+				if (label != null)
+					label.label = game.name;
 				src_icon.icon_name = game.source.icon;
 
 				src_icons.foreach(w => w.destroy());
@@ -386,7 +387,14 @@ namespace GameHub.UI.Views.GamesView.Grid
 
 		private void status_handler(Game.Status s)
 		{
+			// Use weak reference to avoid capturing `this` strongly
+			weak GameCard weak_self = this;
+
 			Idle.add(() => {
+				// early return when GameCard got destructed to prevent segfault
+				if (weak_self == null)
+					return Source.REMOVE;
+
 				label.label = game.name;
 				status_label.label = s.description;
 				favorite_icon.visible = game.has_tag(Tables.Tags.BUILTIN_FAVORITES);