The title screen now shows a course-select row: one card per course with its
emoji, name, your best time, and a ghost badge. The current course is
highlighted "you are here"; the others are links. COURSE_META in course/spec
is the one source of truth for the rotation — the title cards and the in-game
switcher both read it, so they can't drift.
Fixes a real cross-course bug found while scoping this: ghosts were stored
under one global key, so your Breakfast Rush ghost would replay through Butter
Run's walls. save/load/has/time now take an optional course key (threaded
installGhost -> recorder/player); the default course keeps the bare legacy key
so nobody's existing ghost is orphaned. The title's best/ghost line is
course-aware for the same reason.
Browser-verified with seeded storage: cards show per-course bests and ghost
badges independently, current-course card highlights, clicking a card loads
that course, breakfast's data untouched from butter. tsc + build green.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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