Add trips to UI

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

drb-frontend/lib/c2api.ts

@@ -134,6 +134,19 @@ export const c2api = {
   setPreferredToken: (tokenId: string, systemId: string) =>
     request<{ ok: boolean; preferred_for_system_id: string | null }>(`/tokens/${tokenId}/prefer/${systemId}`, { method: "PUT" }),
 
+  // Trips
+  getTrips: () => request<import("@/lib/types").TripRecord[]>("/trips"),
+  getTrip: (id: string) =>
+    request<import("@/lib/types").TripRecord & { events: import("@/lib/types").TripEvent[] }>(`/trips/${id}`),
+  createTrip: (body: object) =>
+    request<import("@/lib/types").TripRecord>("/trips", { method: "POST", body: JSON.stringify(body) }),
+  deleteTrip: (id: string) =>
+    request(`/trips/${id}`, { method: "DELETE" }),
+  createTripEvent: (tripId: string, body: object) =>
+    request<import("@/lib/types").TripEvent>(`/trips/${tripId}/events`, { method: "POST", body: JSON.stringify(body) }),
+  deleteTripEvent: (tripId: string, eventId: string) =>
+    request(`/trips/${tripId}/events/${eventId}`, { method: "DELETE" }),
+
   // Per-system AI flag overrides
   setSystemAiFlags: (systemId: string, flags: { stt_enabled?: boolean | null; correlation_enabled?: boolean | null }) =>
     request<{ ok: boolean; ai_flags: Record<string, boolean> }>(`/systems/${systemId}/ai-flags`, {