feat(system): nomarchy-control-center TUI

Implemented TUI control center using gum. Added to systemPackages and rofi System menu. Verified: V1. Pending: V3 visual check.

modules/home/rofi.nix

@@ -557,6 +557,10 @@ ${themeRows}
         exec ${cfg.terminal} -e sh -c "nomarchy-doctor
           printf '\nEnter to close.'; read -r _" ;;
 
+      controlcenter)
+        # Nomarchy TUI Control Center.
+        exec ${cfg.terminal} -e nomarchy-control-center ;;
+
       rollback)
         # Undo, one menu away (informative + rock-stable). Desktop =
         # Home Manager generations: theme/config history is already one
@@ -650,6 +654,7 @@ ${themeRows}
           command -v nomarchy-snapshots >/dev/null 2>&1 && row "Snapshots" timeshift
           row "Rollback" edit-undo
           command -v nomarchy-doctor >/dev/null 2>&1 && row "Doctor" utilities-system-monitor
+          command -v nomarchy-control-center >/dev/null 2>&1 && row "Control Center" preferences-desktop
           if [ -e "''${bats[0]}" ] && command -v powerprofilesctl >/dev/null 2>&1; then
             row "Power profile" preferences-system-power
           fi
@@ -669,6 +674,7 @@ ${themeRows}
           *Snapshots*)        exec "$0" snapshot ;;
           *Rollback*)         exec "$0" rollback ;;
           *Doctor*)           exec "$0" doctor ;;
+          *"Control Center"*) exec "$0" controlcenter ;;
           *"Power profile"*)  exec "$0" power-profile ;;
         esac ;;
 

modules/nixos/default.nix

@@ -280,6 +280,7 @@ in
     environment.systemPackages = with pkgs; [
       nomarchy-theme-sync # provided by overlays.default
       nomarchy-doctor     # read-only health check (System › Doctor)
+      nomarchy-control-center # TUI control center
 
       # Friendly wrappers for the two rebuild paths (README §3). Run as
       # your user: `nix flake update` must NOT run as root (libgit2