Pull a brand palette from a screenshot

A button on a summit or brand record in Airtable calls the webhook. The workflow marks the screenshot status as running and sends the branding page screenshot to an OpenAI model through the chat completions API.

The model returns a brand palette: primary, secondary, accent, dark neutral and light neutral, as hex codes. The palette is saved to the record's branding_palette field and the status is updated. A code step works out the cost from the token usage, and a row is added to an AI usage table with the brand, summit, model, tokens and cost.