feat(system): menu parity for downstream options (slice 2)

Added pickers for terminal, keyboard layout, and auto-login to the Control Center TUI, wiring them directly to Nix defaults via theme-state.json settings. Verified: V1.

modules/home/options.nix

@@ -100,13 +100,13 @@ in
     # ── Preferences ────────────────────────────────────────────────
     terminal = lib.mkOption {
       type = lib.types.str;
-      default = "ghostty";
+      default = config.nomarchy.settings.terminal or "ghostty";
       description = "Terminal emulator command, used by keybinds and $TERMINAL.";
     };
 
     keyboard.layout = lib.mkOption {
       type = lib.types.str;
-      default = "us";
+      default = config.nomarchy.settings.keyboard.layout or "us";
       example = "de";
       description = ''
         XKB layout for the Hyprland session. The console (and the LUKS

modules/nixos/options.nix

@@ -11,7 +11,7 @@
 
     greeter.autoLogin = lib.mkOption {
       type = lib.types.nullOr lib.types.str;
-      default = null;
+      default = config.nomarchy.settings.greeter.autoLogin or null;
       example = "ada";
       description = ''
         Log this user straight into Hyprland on boot (greetd