refactor: rework NixOS desktop module

modules/nixos/desktop/sway/default.nix

@@ -0,0 +1,35 @@
+{ pkgs, lib, config, ... }:
+with lib;
+let
+  cfg = config.modules.desktop.sway;
+in
+{
+  options.modules.desktop.sway = {
+    enable = mkEnableOption "Enable Steam Platform";
+  };
+  config = mkIf cfg.enable {
+    security.pam.services.swaylock = {};
+    security.rtkit.enable = true;
+    services.pipewire = {
+      enable = true;
+      alsa.enable = true;
+      alsa.support32Bit = true;
+      pulse.enable = true;
+    };
+    xdg.portal = {
+      enable = true;
+      wlr.enable = true;
+      # gtk portal needed to make gtk apps happy
+      extraPortals = [ pkgs.xdg-desktop-portal-gtk ];
+      config = {
+        common = {
+          default = [
+            "gtk"
+          ];
+          "org.freedesktop.impl.portal.ScreenCast" = "wlr";
+          "org.freedesktop.impl.portal.Screenshot" = "wlr";
+        };
+      };
+    };
+  };
+}