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Danielle Maywood
7617b6bdcc
Refactor the Agents chat timeline so live assistant output renders as a timeline row through the same components as durable messages, ahead of the stacked MessageScroller migration in #28130. `ConversationTimeline`'s block rendering is extracted into `MessageBlocks`, the streaming/durable assistant split collapses into a shared `AssistantOutput`, and `LiveStreamTail` shrinks to the empty state and terminal failure callout. Row keys are plain `message:<id>` strings; the live assistant row is a separate ephemeral row. This PR does not change scrolling behavior and adds no backend, API, or database fields. <details> <summary>Implementation notes</summary> - Extract `BlockList` and friends from `ConversationTimeline` into `MessageBlocks` (pure move). - Replace `StreamingOutput` with `AssistantOutput`, used for both live and durable assistant rows. - Render the live assistant as a timeline row via `assignTimelineRows` instead of separate transient content below the transcript. - Keep existing transcript grouping, prompt navigation, and the current scroll container unchanged; the scroller swap happens in #28130. </details> Generated by Coder Agents on behalf of @DanielleMaywood.