fix(web): stop chat jitter when opening citations at the bottom

[brendan-kellam]

Fixes SOU-1486

Clicking a citation while scrolled to the bottom of a chat caused the view to jitter vertically (repeatedly, on every click).

The chat scroll container uses useStickToBottom. While the user is at (or within ~70px of) the bottom, the hook keeps the container anchored to the bottom and re-asserts that position whenever content resizes or scrolls. Selecting a citation kicks off a scrollIntoView (in chatThreadListItem.tsx) to reveal/center the reference, and useStickToBottom fights that scroll by yanking back to the bottom. The two compete for the scroll position for a frame or two on each click, which is the jitter. It only reproduces "at the bottom" because that's the only state where the stick-to-bottom lock is engaged.

Fix: release the stick-to-bottom lock (stopScroll()) when a citation reference is selected, so the reveal scroll can settle without a fight. This is the same state the hook enters when the user scrolls up manually, and it matches the intent of the interaction (you're now inspecting a citation, not following streaming output). Sending a new message re-engages auto-scroll as before.

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