fc-010 Assistant threads and messages

Pages

• Library assistant threads - BusDK UI library assistant thread list contract.
• AIThreadList UI component - Dedicated BusDK UI reference for AIThreadList.
• Library assistant messages - BusDK UI library assistant message rendering contract.
• AIMessage UI component - Dedicated BusDK UI reference for AIMessage.
• AIMarkdown UI component - Dedicated BusDK UI reference for AIMarkdown.