change username to a global var

modules/core/user.nix

@@ -1,7 +1,5 @@
-{ pkgs, inputs, ...}:
+{ pkgs, inputs, username, ...}:
 let
-  name = "FrostPhoenix";
-  username = "frostphoenix";
   packages = with pkgs; [
     fish
   ];
@@ -23,7 +21,7 @@ in
 
   users.users.${username} = {
     isNormalUser = true;
-    description = name;
+    description = ${username};
     extraGroups = [ "networkmanager" "wheel" ];
     shell = pkgs.zsh;
   };

modules/core/virtualization.nix

@@ -1,7 +1,7 @@
-{ config, pkgs, ... }:
+{ config, pkgs, username, ... }:
 {
   # Add user to libvirtd group
-  users.users.frostphoenix.extraGroups = [ "libvirtd" ];
+  users.users.${username}.extraGroups = [ "libvirtd" ];
 
   # Install necessary packages
   environment.systemPackages = with pkgs; [

modules/core/xserver.nix

@@ -1,11 +1,11 @@
-{ pkgs, ... }: 
+{ pkgs, username, ... }: 
 {
   services.xserver = {
     enable = true;
     layout = "us";
     displayManager.autoLogin = {
       enable = true;
-      user = "frostphoenix";
+      user = ${username};
     };
     libinput = {
       enable = true;