Sent Template Builder UI

Design the interface around Sent's v3 definition contract. The UI may import Meta material, but its canonical saved and submitted model must never be Meta's components[] payload.

Product model

Use one draft object with:

• optional category and language;
• required definition.body.multiChannel;
• optional complete body overrides for sms, whatsapp, and rcs;
• optional definition.header, footer, buttons, definitionVersion, and authenticationConfig;
• submission controls for creation_source, submit_for_review, and sandbox.

Do not expose top-level create fields named name, channels, body, header, or buttons. If the product needs an internal display label, keep it outside the Sent create payload.

Recommended editor sequence