ghostty single instance

modules/applications/ghostty/home/nixos.nix

@@ -1,6 +1,12 @@
 { inputs, system, ... }: {
   programs.ghostty = {
-    systemd.enable = true;
+    # Labwc's Close action correctly targets one xdg-toplevel, but Ghostty's
+    # systemd service runs every window in one GTK single-instance process.
+    # If that process exits while handling the request, every Ghostty window
+    # disappears together. Keep each launcher invocation independent instead.
+    systemd.enable = false;
     package = inputs.ghostty.packages.${system}.default;
+
+    settings.gtk-single-instance = false;
   };
 }