Address Form

A shipping or billing address whose fields follow the country: a state and ZIP code for the US, a town and postcode for the UK, family name first for Japan, a generic shape for the rest. Country and region are your shadcn Combobox, searchable, and every field carries its section-prefixed autocomplete token, so browser autofill fills the lot. validateAddress is a pure function in its own file, so your server runs the same rules. Error summary that links to each field, an address-lookup slot, save-as-default, a loading skeleton. Fields that come and go with the country grow and fold to their measured height (Motion; a fade under reduced motion).