The home page no longer reads ?week=YYYY-MM-DD from the URL. Selected week
lives in the tcWeek cookie, set via a server action that revalidates the
home page so the next render reflects it. The URL stays at "/" regardless
of which week the user is viewing.
WeekNav prev/next/today buttons (and the arrow-key bindings) call the
server action directly — no router.refresh dance, no client-side cookie
write. BackToCalendarLink drops its localStorage-based href reconstruction
and just links to "/" since the cookie already remembers the right week
across navigations.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
HomePageClient writes the current weekStart to localStorage("lastWeek")
whenever it changes. BackToCalendarLink (new client component) reads
that value on mount and builds the href — falling back to "/" if nothing
is stored (e.g. direct link to a park page).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>