Add niri as window manager

hmModules/swayidle/default.nix

@@ -52,6 +52,6 @@
   # Otherwise it will start only after Sway and will not work with Hyprland
   systemd.user.services.swayidle = {
     Unit.PartOf = lib.mkForce [ ];
-    Install.WantedBy = lib.mkForce [ "hyprland-session.target" ];
+    Install.WantedBy = lib.mkForce [ "graphical-session-pre.target" ];
   };
 }