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The chat outline concatenated tail and head, reduced over the result in the render body, and rebuilt jumpToPrompt on every delta even when the outline was disabled, which is every native viewport. Memoize the tail's contribution, scan only the head per delta, do nothing while disabled, make jumpToPrompt a stable event so the rail's memo holds, and republish the active prompt only when the index or reading position changes. The view built a Set of every mounted id plus the live head per delta for the outline's pending-jump check; key it on mounted history only and treat live head rows as always mounted. Split plugin projection so a head change does not re-project the tail, memoize the history-window boundary lookup, and read the turn presentation's submission flag with some() instead of allocating a filtered array. Refs #4816 Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>