made hyprland default session for display manager

modules/features/hyprland/default.nix

@@ -14,6 +14,7 @@
       audio
       systemTheme
     ];
+
     runtimePkgs = self'.packages.hyprland.passthru.runtimePackages;
     lib = pkgs.lib;
 
@@ -27,12 +28,16 @@
       enable = true;
       package = self'.packages.hyprland;
     };
+
+    services.displayManager.defaultSession = "hyprland";
     services.xserver.enable = true;
     security.polkit.enable = true;
+
     environment.systemPackages = with pkgs; [
       hyprlock
       gsettings-desktop-schemas
     ];
+
     system.activationScripts.hyprRuntimeEnv = lib.stringAfter ["specialfs"] ''
       mkdir -p /run/hypr-runtime-env/bin
       ${lib.concatStringsSep "\n" (lib.mapAttrsToList (name: pkg: ''
@@ -40,6 +45,7 @@
         '')
         runtimePkgs)}
     '';
+
     system.activationScripts.hyprConfig = lib.stringAfter ["specialfs"] ''
       mkdir -p /run/hypr/config
       ln -sfn ${inputs'.hyprland.packages.repo-files}/* /run/hypr/config