nix-conf/user/theme.nix

{
  config,
  pkgs,
  ...
}: {
  qt = {
    enable = true;
    platformTheme.name = "qtct";
    style.name = "breeze";
    style.package = pkgs.kdePackages.breeze;
  };
  gtk = {
    enable = true;
    gtk2.extraConfig = "gtk-recent-files-max-age = 0";
    gtk3.extraConfig = {gtk-recent-files-limit = 0;};
    theme = {
      name = "Breeze";
      package = pkgs.kdePackages.breeze-gtk;
    };
  };
  home.pointerCursor = {
    name = "breeze_cursors";
    package = pkgs.kdePackages.breeze;
    size = 24;
    gtk.enable = true;
    x11.enable = true;
  };
  home.file.".icons/default/index.theme".enable = false;
  home.file.".icons/breeze_cursors".enable = false;
}