Enable xserver so X11 forwarding works properly

Enable autoLogin with sddm/plasma

Move some environment variable definitions around

flake.nix

@@ -113,7 +113,7 @@
                 package = pkgs.nixVersions.latest;
                 settings.trusted-users = [ username ];
               };
-              services.greetd.settings.initial_session.user = username;
+              services.displayManager.autoLogin.user = username;
               programs.${loginShell} = lib.mkIf (loginShell != "bash") { enable = true; };
               users.users.${username} = {
                 shell = pkgs.${loginShell};

system/desktop/default.nix

@@ -1,18 +1,10 @@
-{
-  config,
-  lib,
-  pkgs,
-  ...
-}:
+{ pkgs, ... }:
 {
   nixpkgs.config.chromium.commandLineArgs = "--enable-features=UseOzonePlatform --ozone-platform=wayland";
   system.autoUpgrade.operation = "boot";
   hardware.bluetooth.enable = true;
   environment = {
-    sessionVariables = {
-      NIXOS_OZONE_WL = "1";
-      QT_QPA_PLATFORM = lib.mkIf config.programs.sway.enable "wayland";
-    };
+    sessionVariables.NIXOS_OZONE_WL = "1";
     systemPackages = with pkgs; [
       libsecret
       libnotify
@@ -55,7 +47,7 @@
       };
     };
     xserver = {
-      enable = false;
+      enable = true;
       xkb = {
         layout = "gb";
         variant = "";

system/desktop/plasma.nix

@@ -1,11 +1,17 @@
 { pkgs, ... }:
 {
   imports = [ ./default.nix ];
-  environment.plasma6.excludePackages = with pkgs.kdePackages; [ plasma-browser-integration ];
+  environment = {
+    plasma6.excludePackages = with pkgs.kdePackages; [ plasma-browser-integration ];
+    sessionVariables.QT_QPA_PLATFORM = "wayland";
+  };
   services = {
-    displayManager.sddm = {
-      enable = true;
-      wayland.enable = true;
+    displayManager = {
+      autoLogin.enable = true;
+      sddm = {
+        enable = true;
+        wayland.enable = true;
+      };
     };
     desktopManager.plasma6 = {
       enable = true;

system/desktop/sway.nix

@@ -2,7 +2,10 @@
 {
   imports = [ ./default.nix ];
   environment = {
-    sessionVariables.GRIM_DEFAULT_DIR = "$HOME/Pictures/Grim";
+    sessionVariables = {
+      QT_QPA_PLATFORM = "wayland";
+      GRIM_DEFAULT_DIR = "$HOME/Pictures/Grim";
+    };
     systemPackages = with pkgs; [
       wtype
       wl-clipboard