Tracks the scroll position and shows a small date chip pinned to the
right edge of the timeline, fading in while the user scrolls and out
700ms after they stop. Only active in date-sorted views — other sort
modes hide it since the label would be meaningless. A cached
row-offset/date index keeps the lookup to a single binary search per
scroll frame.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
dtoro
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