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The streaming and settled versions of the trailing assistant reply were two components, so settling unmounted one and mounted the other and the entrance tween replayed over text the reader was already on. One LatestAssistantEntry now owns that row under a single key, and the history list excludes it. The CSS entrance keyframe that doubled the GSAP tween is gone and the tween matches the documented 160ms. The step timeline no longer remounts on settle: it is a button-controlled disclosure with a 180ms grid-rows transition, the reader's own toggle wins over the live default, and an in-flight request with no events yet shows a queued row instead of an empty shell. BUG-474 BUG-475 Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01JUei7K13cYxLHE3Axe4A45