Add support of GenAI to rapidly assist in content creation

[SharadKumar]

It would be super useful if we could have context provided in config (or also on admin) and have a GenAI sparkle icon next to text input/textarea fields in Keystatic admin. Admins setup their own OpenAI compatible api keys of course.

For example:
https://dub.co/blog/introducing-dub-ai

Vercel SDK released yesterday makes it much easier (cleaner) to implement. Also you get compatibility with various models.
https://sdk.vercel.ai/docs/ai-sdk-core/generating-structured-data

This shall bring utility of Keystatic admin and content authoring to another level.

[simonswiss]

Ummmm, so... 🤗

https://twitter.com/thekeystatic/status/1788462053038125520