chore: m3-are to new ui

hosts/m3-ares/services/greetd.nix

@@ -0,0 +1,38 @@
+# greetd login manager for m3-kratos (replaces broken GDM on nixos-unstable).
+# Uses tuigreet as the greeter, launching Hyprland after authentication.
+{
+  pkgs,
+  config,
+  lib,
+  ...
+}: let
+  tuigreet = "${lib.getExe pkgs.tuigreet}";
+  # Use start-hyprland wrapper to avoid Hyprland startup warnings
+  # withUWSM=true is set in programs.nix; start-hyprland handles this correctly
+  hyprlandCmd = "${config.programs.hyprland.package}/bin/start-hyprland";
+in {
+  services.greetd = {
+    enable = true;
+
+    settings = {
+      default_session = {
+        user = "greeter";
+        # Minimal config: verified supported flags only
+        # The --time and --remember are tested; power commands omitted
+        # to avoid potential quoting/parsing issues
+        command = builtins.concatStringsSep " " [
+          tuigreet
+          "--time"
+          "--remember"
+          "--asterisks"
+          "--cmd ${hyprlandCmd}"
+        ];
+      };
+    };
+  };
+
+  # Required for --remember to persist username between logins
+  systemd.tmpfiles.rules = [
+    "d /var/cache/tuigreet 0755 greeter greeter - -"
+  ];
+}