Days with 4+ entries open with an hour-grid timeline in the day editor:
untimed entries in an all-day strip, timed ones positioned by start/end
with side-by-side columns for overlaps, click-to-edit. Layout math lives
in a pure, unit-tested module (timelineLayout.js).
Today's month-grid cell gets a vertical red slider positioned by the
fraction of the day elapsed; the timeline gets the classic horizontal
red current-time line. Both tick every minute with cleanup on unmount,
and the initial positioning runs unconditionally while the node is
still detached (the isConnected self-heal gates only interval ticks).
Also splits entryRow rendering out of dayEditor.js to stay under the
500-line cap.
grabowski
b0bdd2570c