Focus: textarea gets refocused via inputRef after the AI response (or error) lands
Persistence: chat history saved to localStorage keyed by trip ID, loaded on mount — survives refreshes
lib/types.ts — TripRecord and TripEvent types
lib/c2api.ts — getTrips, getTrip, createTrip, deleteTrip, createTripEvent, deleteTripEvent
lib/useTrips.ts — Firestore realtime hook on the trips collection, ordered by start date
app/trips/page.tsx — List page split into Upcoming / Past sections, card click navigates to detail, "+ New Trip" modal for admins with all fields including date range and maps link
app/trips/[id]/page.tsx — Detail page fetched via C2 API (gets trip + events in one call), day-by-day itinerary with time, location, maps link, notes, and Discord attendees. Add Event modal (date constrained to trip range). Admin-only delete trip + remove event.
components/Nav.tsx — Trips link added to the nav