A dashed edge and a thinner wash say "this bar has not started". They do
not say where the running ones ended, so a board with the future switched
on had to be decoded bar by bar to answer the question a reader opens it
with — what is on now.
So the boundary gets a label, and it is the same object as a lane's name:
a small eyebrow pinned to the left edge, surviving any scroll position. In
muted ink rather than a hue, because a hue on this board means "whose
event is this" and this is not about a game. One per lane, since "where
does this stop running?" is a different answer for each of them.
Where it goes is a single index rather than a per-row test, because there
is only one boundary: every order this board can be given puts live rows
before upcoming ones, and `splitAt` is exported so that is a test rather
than a comment.
Co-Authored-By: Claude Opus 5 (1M context) <[email protected]>
