Allow book owner to add customised AI writing prompts
Context
Currently, book owners can turn on AI writing prompts for their book. This allows collaborators with edit-access to use free-text prompts. There are use cases for book owners to limit free-text prompts and set customised prompts (e.g. for frequently used prompts or context-specific prompts)
Proposal
- When AI prompt use is enabled, let book owners set customised prompts per book
- When customised prompts are enabled, let book owners limit free-text prompts