Clicking a folder in the sidebar (or any section change) didn't
reset the timeline's scroll position. If the user was scrolled deep
into All Photos, the new folder loaded at the same y-offset, often
landing on empty space below the last row.
The section-change effect already cleared selection and reset the
auto-focus guard; just needed to also reset parentRef.current.scrollTop.
Synchronous so the first paint of the new section is anchored at
photo[0]; the auto-focus selectPhoto call still runs after render
to highlight the first photo.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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