[desktop] Refactor into multiple components

roles/desktop/wayland.nix

@@ -0,0 +1,23 @@
+{ lib, config, pkgs, ... }:
+
+with lib;
+
+let
+  cfg = config.roles.desktop;
+in
+{
+  config = mkIf (cfg.enable && cfg.wayland) {
+    programs.sway = {
+      enable = true;
+      wrapperFeatures.gtk = true;
+    };
+    programs.light.enable = true;
+
+    environment.systemPackages = with pkgs; [
+      grim
+      slurp
+      wl-clipboard
+      mako
+    ];
+  };
+}