The palette already lived in CSS custom properties, so dark mode is a
token-override block in the new theme.css, applied via data-theme on
the document element. A moon/sun toggle sits top right in the navbar;
an explicit choice persists in localStorage, otherwise the app follows
the OS preference live. An inline head script applies the theme before
first paint so a dark reload never flashes light.
Token hygiene sweep alongside: literal colours that broke under a dark
palette (timeline chip text, color-mix against white, calendar stripes
and bands, warning banners, nav background) moved into ten new tokens
with light-mode values unchanged. The flip clock keeps its fixed dark
look by design; the map keeps standard light tiles in both themes.
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