fix(web): threads open at the newest message, not thousands of pixels above it (#19663)

Co-authored-by: Aaron Queen <bompus@users.noreply.github.com>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
Co-authored-by: Julius Marminge <julius0216@outlook.com>
a0fd206386Theo Browne committed on 10/19/2026, 6:07:15 PM· committed by GitHubparentbab2613
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