## Summary

- rebuild the chat transcript around grouped authors and 20px shape-coded identity marks - collapse each tool run to one fixed-height status line with an expandable completed summary - replace mention-driven chrome with explicit Room and Planner destinations, truthful queue promotion, and composer-level Stop and question controls - keep tool ownership stable across live events and reloads, and allow Room conversation when the agent is off

## Evidence

The browser coverage captures both required states:

- a running turn with a queued Planner request - a finished turn with a failed tool call expanded

Both states are asserted by `e2e/smoke.e2e.ts` and were visually checked from the generated Playwright captures.

## Test plan

- `bun run ci` - `bun run types` - `bun test` — 594 passed - `bun run e2e` — 59 passed