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- Batch live chat events: fold a burst in one pass per animation frame
(rAF + timeout fallback for hidden tabs) instead of one reactive cycle per
WS frame. Flushed before send/resync to keep ordering.
- De-dup the late-join replay against committed history: provisional chunks
of the in-flight turn already persisted (CR-6 per-step persistence) are
hidden by aligned-prefix matching (fail-safe: mismatch shows, never hides).
- Memoize chunks/turnMetrics getters by state identity.
- LazyCollapse: tool/thinking card bodies mount only on first open.
- content-visibility:auto on transcript rows.
- scripts/probe-replay.ts + bench-pure.ts for measuring the replay path.
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