begin to create checks to make nixos modules home-manager independent

modules/features/applications/gui/kitty.nix

@@ -2,11 +2,20 @@
   flake.nixosModules.graphics = { pkgs, config, lib, ... }: {
     options.features.applications.gui.kitty.enable = lib.mkEnableOption "kitty";
 
-    config.home-manager.sharedModules = lib.mkIf (config.features.applications.gui.kitty.enable) [
-      {
-        features.applications.gui.kitty.enable = true;
-      }
-    ];
+    config = let
+      mkIfElse = with lib; p: yes: no: mkMerge [
+        (mkIf p yes)
+        (mkIf (!p) no)
+      ];
+    in lib.mkIf (config.features.applications.gui.kitty.enable) (mkIfElse (config.features.nixos.home-manager.enable) {
+      home-manager.sharedModules = [
+        {
+          features.applications.gui.kitty.enable = lib.mkDefault true;
+        }
+      ];
+    } {
+      environment.systemPackages = [ pkgs.kitty ];
+    });
   };
 
   flake.homeModules.graphics = { pkgs, config, lib, ... }: {