misc improvements to modularity

modules/features/applications/gui/kitty.nix

@@ -6,7 +6,7 @@
   flake.nixosModules.graphics = { pkgs, config, lib, ... }: {
     config = let
     in lib.mkIf (config.features.applications.gui.kitty.enable) (inputs.helpers.mkIfElse (config.features.nixos.home-manager.enable) {
-      home-manager.users.grey.features.applications.gui.kitty.enable = lib.mkDefault true;
+      home-manager.users.${config.info.userName}.features.applications.gui.kitty.enable = lib.mkDefault true;
     } {
       environment.systemPackages = [ pkgs.kitty ];
     });