Every unlocked unit carried the "current" class, so three nodes lit up
identically and none of them pointed anywhere. Mark only the first
unlocked unit that is not finished; the rest stay open but quiet.
The finish node filled its whole circle with chequers, which read as the
placeholder pattern for a missing image rather than as a flag, most of
all in light mode. Give it the plain face the other locked nodes have and
put the chequers in a small badge where they show a padlock.
Co-authored-by: Cursor <cursoragent@cursor.com>
