Feature Request: Generative UI support

[zahlekhan]

Problem
Onyx agents can retrieve structured data from 40+ connectors, RAG, and the web, but can only present it as markdown or code interpreter output. When an agent pulls Q3 sales numbers or compares documents, users get walls of text instead of charts, tables, or interactive cards.

Proposed Solution
Integrate OpenUI, an open-source (MIT) Generative UI framework.