Gift wrap + greeting card add-on at cart, how does the workflow actually run?

Q4 attach rate runs 18-32% on toy stores I ship; pure margin. Architecture:

• Native Magento gift options, per-line-item or per-order gift wrap + message. Free for basic functionality, but UI is ugly.
• Mageplaza Gift Wrap or Amasty Gift Wrap, both add per-line-item wrap selection with multiple wrap styles (kids / classic / luxury), custom message (250 char), recipient address. ~$129-$199 one-time. Best fit for most toy stores.
• Custom build, if you sell gift sets or wrap is a meaningful margin line, build it native. ~$3k-$6k.

The operational piece most stores miss:

• Wrap SKUs as separate inventory items, "Holiday wrap red" is SKU GIFT-WRAP-RED, "Holiday wrap blue" is GIFT-WRAP-BLUE. Warehouse picks them with the order. You can run out of red wrap and the cart auto-disables that option.
• Greeting card SKUs, same model. Pre-printed (Birthday / Get Well / Christmas / Hanukkah / Diwali / Generic) plus custom-message option.
• Ship-to-different-address per line item, gift orders often go to multiple recipients. Magento can do this natively if the order is split into multiple shipments at checkout.

Q4 UI rule: mobile-first cart drawer. Customers buying at 11pm on a phone don’t want a 3-click upsell. One toggle, message field auto-expands, done. Hyvä handles this in ~40 lines of Alpine.js.