Refactor home manager, and add desktop node on sparky.

common/desktop-node.nix

@@ -0,0 +1,56 @@
+{ pkgs, ... }:
+{
+  # Enable Hyprland (Wayland compositor)
+  programs.hyprland = {
+    enable = true;
+    xwayland.enable = true; # For compatibility with X11 apps if needed
+  };
+
+  # Essential desktop services
+  services.dbus.enable = true;
+
+  # polkit for privilege escalation
+  security.polkit.enable = true;
+
+  # Enable sound with pipewire
+  security.rtkit.enable = true;
+  services.pipewire = {
+    enable = true;
+    alsa.enable = true;
+    alsa.support32Bit = true;
+    pulse.enable = true;
+  };
+
+  # XDG portal for screen sharing, file pickers, etc.
+  xdg.portal = {
+    enable = true;
+    extraPortals = [ pkgs.xdg-desktop-portal-hyprland ];
+  };
+
+  # Fonts
+  fonts.packages = with pkgs; [
+    noto-fonts
+    noto-fonts-cjk-sans
+    noto-fonts-emoji
+    liberation_ttf
+    fira-code
+    fira-code-symbols
+  ];
+
+  # Enable GDM for login (can also use greetd or ly for lighter options)
+  services.greetd = {
+    enable = true;
+    settings = {
+      default_session = {
+        command = "${pkgs.greetd.tuigreet}/bin/tuigreet --time --cmd Hyprland";
+        user = "greeter";
+      };
+    };
+  };
+
+  # Environment variables for Wayland
+  environment.sessionVariables = {
+    NIXOS_OZONE_WL = "1"; # Hint electron apps to use Wayland
+    WLR_NO_HARDWARE_CURSORS = "1"; # Fix cursor rendering on some hardware
+  };
+}