Personalisation: an inscription or other text the buyer writes

In the product editor, the "Personalisation" card adds fields the buyer fills in — for example "Inscription on the cake" or "Name on the mug". Press "Add a field", write the field name (optionally in English too), the maximum number of characters (1–200) and tick "Required" if you can't sell the product without it; a product can have up to 3 fields. Add flavour and size as ordinary options — those can have their own price and stock; a text field never changes the price. On the product page the fields sit under the options, the same product added with different text stays as separate cart lines, and the text is saved on the order line and shows on the order page and in the email. The server checks the length and required fields. "Quick add" from a card opens the product page for such products so the buyer can write the text.