Requirement
Introduce an in-app assistant that talks to a backend over AG-UI, with UI built from assistant-ui.
- Entry point: Repurpose the top bar search: natural language opens the assistant; 16 - 32 hex strings still go to trace lookup.
- Layout: Assistant opens as a fixed-width right column (not a floating modal), transform on the main column when the dock is open so trace views fixed stay in the main area and don’t cover the panel.
User flows: https://docs.google.com/document/d/1hMp-XebGJgOIWO5EzGBlHX332akVQTO13sGVh100AOc/edit?usp=sharing