feat(nixos): configure zeus monitor layout

configs/nixos/hosts/zeus/default.nix

@@ -1,4 +1,9 @@
-{ lib, pkgs, ... }:
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
 # zeus — Ryzen desktop with AMD graphics.
 # Disk layout is in ./disk.nix.
 # `fileSystems` are derived from it, none declared here.
@@ -45,6 +50,11 @@
   modules.desktop.apps.obsidian.enable = true;
   modules.desktop.apps.steam.enable = true;
 
+  home-manager.users.${config.user.name}.wayland.windowManager.hyprland.settings.monitor = [
+    "HDMI-A-1,1920x1080@120,0x0,1,transform,3"
+    "DP-3,2560x1440@239.96,1080x0,1"
+  ];
+
   time.timeZone = "America/New_York";
   i18n.defaultLocale = "en_GB.UTF-8";
 }