Three deep-linkable tabs (#/trip/:id/:tab): Trip (countdown, calendar,
map, summary), Money (costs + expenses side by side), Checklist. Panels
stay mounted; switching toggles visibility and updates the URL via
history.replaceState so an open day editor and the live tickers are
undisturbed. The Leaflet map revalidates its size on every trip-tab
activation but only auto-fits once, when its container first gains
real size - later visits keep the user's pan/zoom.
The full-width trip-header card is gone: the navbar now carries a
compact identity (back link, truncated name, date/days/currency) plus
a single overflow menu holding members, join code, edit (now a
centered modal) and delete. Dead header CSS removed; new styles live
in tabs.css.
grabowski