A per-user ShotCommentRead marker records how far each person has read a
shot's comments. Comments and replies from others after the marker put an
orange "!" beside the shot code; its popover lists them and only "Mark
read" clears it. A chip filters the board to flagged shots and marks all
read. The migration marks existing comments as read so the board starts
clean.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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