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* fix(web): kick the compositor on a chat scroll freeze, then take the wheel and keyboard over by default When the freeze probe calls the chat log frozen, apply one frame of `will-change: transform` so Blink rebuilds the scroller's compositing state from the current layout, let the next downward wheel through natively and measure it against what it asked for (the detector's own normalisation and 8px yardstick), and only if it stuck, fell short or snapped back answer the wheel and the scrolling keys from JavaScript. The takeover is on by default now; `open-design:chat-scroll-takeover = '0'` is the escape hatch. `ChatPane` releases the takeover — and asks the probe to start a fresh surface — when `activeConversationId` changes, because the log node is reused across conversations. A healed surface is released the same way so a recurrence can be judged again. One new event, `client_chat_scroll_heal`, carries the outcome, the kick geometry and the notch arithmetic, joined to the freeze by `probe_id`; `client_chat_scroll_frozen` is untouched. * fix(web): keep Home/End finite and let the takeover go when the chat log is removed Home and End were ±Infinity folded into the same pixel accumulator as the arrows, so Home-then-End in one frame (or key repeat) summed to NaN and the browser read the NaN scrollTop as 0 — End could not reach the bottom. Edge jumps now live in their own `pendingEdge` slot: the last edge pressed wins, pressing one discards the steps queued before it, and steps pressed after it apply on top; applyPending refuses to write a non-finite value. A tab or route unmount removes the chat log without a conversation change, and the probe only notices on a scroll the missing node never sends, so the takeover stayed engaged with its document-level keydown listener cancelling arrows and paging with nothing to scroll. Every input path (wheel, keydown, frame) now checks `isConnected` and disengages, and ChatPane's release effect also releases in its cleanup.