feat: add desktop system role and enable themes only if enabled

hosts/brontes/default.nix

@@ -33,6 +33,8 @@
 
   modules = {
     system = {
+      roles.desktop.enable = true;
+
       outputs = {
         "DP-2" = {
           resX = 1920;

hosts/marr/default.nix

@@ -17,6 +17,8 @@
     media.enableAll = true;
 
     system = {
+      roles.desktop.enable = true;
+
       outputs = {
         eDP-1 = {
           resX = 3840;

modules/themes/default.nix

@@ -1,5 +1,11 @@
-{ pkgs, ... }:
 {
+  pkgs,
+  lib,
+  config,
+  ...
+}:
+{
+  config = lib.mkIf config.modules.system.roles.desktop.enable {
     qt = {
       enable = true;
       platformTheme = "gtk2";
@@ -13,4 +19,5 @@
       catppuccin-papirus-folders
       #catppuccin-kvantum
     ];
+  };
 }

options/system/roles/default.nix

@@ -1 +1,6 @@
-{ imports = [ ./terminal.nix ]; }
+{
+  imports = [
+    ./terminal.nix
+    ./desktop.nix
+  ];
+}

options/system/roles/desktop.nix

@@ -0,0 +1,9 @@
+{ lib, ... }:
+let
+  inherit (lib) mkEnableOption;
+in
+{
+  options.modules.system.roles.desktop = {
+    enable = mkEnableOption "desktop usage features";
+  };
+}