[Build] feat(checkout): add promo eligibility UX and tooltip guidance

# Checkout Cerdas: Memastikan Promo Nggak Terlewat Aku baru saja menyelesaikan fitur yang menurutku cukup --- ### Raw Commit Data ## GitHub Update **Repository:** [MKWcorp/POS-DRW-Skincare](https://github.com/MKWcorp/POS-DRW-Skincare) **Author:** multimediadrw **Date:** 5/13/2026, 6:13:47 PM **Commit:** [`4854990`](https://github.com/MKWcorp/POS-DRW-Skincare/commit/485499086c59fb9f6d4a26aab51f1314fc2c26f5) ### Commit Message feat(checkout): add promo eligibility UX and tooltip guidance --- _This story was imported from historical commits._