nix-config/hosts/common/optional/gaming/steam.nix

{
  config,
  lib,
  pkgs,
  ...
}: {
  programs = {
    steam = {
      enable = true;
    };
  };

  xdg.mime = {
    defaultApplications."x-scheme-handler/steam" = "steam.desktop";
    addedAssociations."x-scheme-handler/steam" = "steam.desktop";
  };
}