Faster Upsells and Translatable Labels

Performance

• Faster upsell loading on cart drawer open — browser caching and parallelized product fetching reduce repeat load times
• Fix N+1 variant lookup that fetched the full product catalog per variant
• Deduplicate product IDs to prevent redundant network requests
• Add Cache-Control headers to all public API routes

New Features

• Translatable “Save” badge label on cart items
• Translatable “Savings” and “Discount” labels in cart summary
• Support {code} placeholder in promo code invalid coupon message. Eg: Discount code {code} does not exist

Improvements

• Add race condition guard to prevent duplicate upsell renders
• Fix variant title overwriting custom product description