Rewrite my ./generated/modules/traveldroid/desktop/stylix.nix  to integrate nicely with my existing flake.nix en host.nix
Avoid infinite recursion
Just look at how to rewrite this, ignore previous interactions around stylix.nix
This version worked, stay as close to it as you can.
Specifically avoid this error:
       error: The option `home-manager.users.henrov.stylix' does not exist. Definition values:
       - In `/nix/store/lbvakwy35r61bb10s9pj921dsndq5g2p-source/Droidnix/generated/modules/traveldroid/desktop/stylix.nix':
           {
             enable = true;
             targets = {
               gtk = {
                 enable = true;
           ...
Just add gtk.target = enable
I added gtk.nix for reference
I added thunar.nix for reference




------------------------------------------------------------------------
{ lib, config, pkgs, ... }:

let
  username = config.defaultUser or "henrov";

  moduleName = "stylix";
  assetPath = ../../../assets/system/conf/${moduleName};

  # Read all files in asset directory
  programFiles = builtins.readDir assetPath;

  files = lib.genAttrs (builtins.attrNames programFiles) (name: {
    source = "${assetPath}/${name}";
  });

  # Read optional stylix.conf
  stylixConfFile = "${assetPath}/stylix.conf";
  stylixConf =
    if builtins.pathExists stylixConfFile
    then builtins.readFile stylixConfFile
    else "";

  # Cursor defaults
  cursorName = "phinger-cursors-light";
  cursorSize = 24;
in
{
  # System packages
  environment.systemPackages = [
    pkgs.feh
    pkgs.st
  ];

  # Home Manager user settings
  _module.args.hmUsers = {
    ${username} = {

      # Copy all stylix config files into ~/.config/stylix/
      xdg.configFile =
        lib.mapAttrs' (name: value: {
          name = "${moduleName}/${name}";
          value = { inherit (value) source; };
        }) files;

      # Session variables
      home.sessionVariables = {
        STYLIX_CONF = "$HOME/.config/stylix/stylix.conf";

        XCURSOR_THEME    = cursorName;
        XCURSOR_SIZE     = toString cursorSize;
        HYPRCURSOR_THEME = cursorName;
        HYPRCURSOR_SIZE  = toString cursorSize;
      };
    };
  };
}
------------------------------------------------------------------------

flake.nix

{
  description = "Droidnix: A dendritic NixOS + Home Manager configuration";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";

    home-manager = {
      url = "github:nix-community/home-manager";
      inputs.nixpkgs.follows = "nixpkgs";
    };

    import-tree.url = "github:vic/import-tree";

    stylix = {
      url = "github:nix-community/stylix";
      inputs.nixpkgs.follows = "nixpkgs";
    };

    zen-browser = {
      url = "github:youwen5/zen-browser-flake";
      inputs.nixpkgs.follows = "nixpkgs";
    };

    hyprland.url = "github:hyprwm/Hyprland";
  };

  outputs = { self, nixpkgs, home-manager, import-tree, stylix, hyprland, zen-browser, ... }:
    let
      system = "x86_64-linux";
      flakeRoot = self;
    in {
      nixosConfigurations = {
        traveldroid = nixpkgs.lib.nixosSystem {
          inherit system;

          modules = [
            ./generated/hosts/traveldroid/host.nix
          ];

          specialArgs = {
            inherit flakeRoot;
            inherit home-manager import-tree stylix hyprland zen-browser;
          };
        };
      };
    };
}

------------------------------------------------------------------------

host.nix

{ lib, config, pkgs, flakeRoot, import-tree, home-manager, ... }:

let
  hostname = "traveldroid";

  modulesPath = "${flakeRoot}/generated/modules/${hostname}";
  usersPath   = "${flakeRoot}/generated/users";

  hostModules = import-tree modulesPath;
  globalUsers = import-tree usersPath;

  allModules = hostModules.imports ++ globalUsers.imports;

in
{
  #################################
  # Core system config
  #################################

  networking.hostName = hostname;
  system.stateVersion = "26.05";

  #################################
  # Imports
  #################################

  imports =
    [
      ./boot.nix
      ./hardware-configuration.nix

      # REQUIRED for Home Manager
      home-manager.nixosModules.home-manager
    ]
    ++ allModules;

  #################################
  # Home Manager integration
  #################################

  home-manager.useGlobalPkgs = true;
  home-manager.useUserPackages = true;
}

gtk.nix:

{ pkgs, config, lib, ... }:

let
  # Resolve the username from the host config
  username = config.defaultUser or "henrov";
in
{
  ############################
  # System-level GTK packages
  ############################
  environment.systemPackages = with pkgs; [
    gtk3
    gtk4
  ];

  ############################
  # Home Manager user-level GTK configuration
  ############################
  # Directly assign the GTK config to the user, no recursiveUpdate
  home-manager.users."${username}" = {
    gtk = {
      enable = true;

      # GTK theme
      theme = {
        name    = "Catppuccin-Mocha-Standard-Blue-Dark";
        package = pkgs.magnetic-catppuccin-gtk;
      };

      # Icon theme
      iconTheme = {
        name    = "Papirus-Dark";
        package = pkgs.papirus-icon-theme;
      };

      # Extra GTK3 / GTK4 settings
      gtk3.extraConfig = {
        "gtk-application-prefer-dark-theme" = 1;
      };
      gtk4.extraConfig = {
        "gtk-application-prefer-dark-theme" = 1;
      };
    };
  };
}

Thunar.nix:

{ pkgs, config, lib, ... }:

let
  # Resolve the default username from host config
  username = config.defaultUser or "henrov";
in
{
  ############################
  # System-level packages
  ############################
  environment.systemPackages = with pkgs; [
    thunar                  # main file manager
    thunar-archive-plugin    # zip, tar, rar, 7z support
    thunar-volman            # auto-mount removable drives
    gvfs                     # support for external drives and network shares
    xarchiver                # optional GUI archive manager
  ];

  ############################
  # Home Manager user-level configuration
  ############################
  # Direct assignment to the user avoids recursiveUpdate issues
  home-manager.users."${username}" = {
    home.stateVersion = "26.05";  # required

    home.sessionVariables = {
      FILE_MANAGER = "thunar";
      USERNAME     = username;
    };
  };
}