build(control-ui): prefer bun for UI build

scripts/package-mac-app.sh

@@ -146,8 +146,8 @@ else
 fi
 
 if [[ "${SKIP_UI_BUILD:-0}" != "1" ]]; then
-  echo "🖥  Building Control UI (pnpm ui:build)"
-  (cd "$ROOT_DIR" && pnpm ui:build)
+  echo "🖥  Building Control UI (ui:build)"
+  (cd "$ROOT_DIR" && node scripts/ui.js build)
 else
   echo "🖥  Skipping Control UI build (SKIP_UI_BUILD=1)"
 fi