switch to regreet cause looks cooler and also fix swaylock

hosts/niks/configuration.nix

@@ -6,7 +6,12 @@
 }: 
 let
     swayConfig = pkgs.writeText "greetd-sway-config" ''
-        exec "${pkgs.greetd.gtkgreet}/bin/gtkgreet -l; swaymsg exit"
+        # https://github.com/swaywm/sway/issues/5732#issuecomment-1583336383
+        exec systemctl --user import-environment DISPLAY WAYLAND_DISPLAY SWAYSOCK XDG_CURRENT_DESKTOP
+        exec hash dbus-update-activation-environment 2>/dev/null && \
+         dbus-update-activation-environment --systemd DISPLAY WAYLAND_DISPLAY SWAYSOCK XDG_CURRENT_DESKTOP
+
+        exec "${pkgs.greetd.regreet}/bin/regreet; swaymsg exit"
         bindsym Mod4+shift+e exec swaynag \
           -t warning \
           -m 'What do you want to do?' \
@@ -60,6 +65,25 @@ in
         nvidiaPatches = false;
     };
 
+    # https://github.com/NixOS/nixpkgs/issues/158025
+    security.pam.services.swaylock = {};
+
+    programs.regreet = {
+        enable = true;
+        settings = {
+            GTK = {
+                application_prefer_dark_theme = true;
+                cursor_theme_name = "Bibata-Modern-Classic";
+                font_name = "JetBrains Mono 16";
+                icon_theme_name = "Papirus-Dark";
+                theme_name = "Catppuccin-Mocha-Standard-Green-dark";
+            };
+            env = {
+                GTK_USE_PORTAL = "0";
+            };
+        };
+    };
+
     fonts.fonts = with pkgs; [
         material-design-icons
         (nerdfonts.override { fonts = [ "JetBrainsMono" ]; })
@@ -159,6 +183,7 @@ in
             settings = {
                 default_session = {
                     command = "${pkgs.sway}/bin/sway --config ${swayConfig}";
+                    user = "greeter";
                 };
             };
         };