[DEMO Per-Product · OOS accessory] Kalerm A5 Coffee Machine

Demo scenario: Out-of-stock accessory in a pick-and-choose list
How to test: One of the three accessories is out of stock. It still appears, greyed out and unselectable, with an “Out of stock” note. Turn on Upgrade Settings → Out of stock → “Hide out-of-stock products” to drop it from the list entirely instead.