fix(planner): draw only the selected day's automated transports

Closes #2019

The route toggle belongs to one day; the reservation list it filtered is the
whole trip. So turning on a day's routing let every transit reservation in the
trip draw its geometry at once, including the ones belonging to other days —
on a day that has no transport of its own, which is what the reporter saw.

Only automated transports rode it, and that is the distinction they drew: a
manually entered train or flight is type 'train'/'flight' and reaches the map
only through its own per-booking toggle. Only the transit search stores
type 'transit'.

Gate the transit branch on the day, and gate only that one — the per-booking
toggle stays trip-wide, because switching a booking's route on is a deliberate
act about that booking. The predicate is the day-order range, not the departure
day: an overnight journey carries end_day_id and has to stay on both of its
days, the same rule the sidebar timeline already applies. Day order rather than
day id, since ids stop being monotonic once days are reordered.

The day context is optional throughout, so a map without one — collections —
keeps behaving exactly as it did. Not a 4.0.0 regression: it reproduces on
3.4.1 too.

client/src/components/Map/MapView.tsx

@@ -16,7 +16,7 @@ import { useTransportRoutes } from '../../hooks/useTransportRoutes'
 import { visibleRouteReservations } from '../../utils/reservationRoutes'
 import { safeHexColor } from '../../utils/safeColor'
 import { escapeHtml } from '@trek/shared'
-import type { Reservation, RouteVia } from '../../types'
+import type { Day, Reservation, RouteVia } from '../../types'
 import { POI_CATEGORY_BY_KEY, type Poi } from './poiCategories'
 import { resolveTrackColor, hasManualTrackColor } from './trackColors'
 import { DEFAULT_MAP_CENTER, DEFAULT_MAP_ZOOM, SATELLITE_TILE_URL, SATELLITE_TILE_ATTRIBUTION, SATELLITE_TILE_MAXZOOM } from '../../constants/mapDefaults'
@@ -526,6 +526,8 @@ export const MapView = memo(function MapView({
   showReservationStats = false,
   visibleConnectionIds = [] as number[],
   showTransitRoutes = true,
+  days = [] as Day[],
+  selectedDayId = null,
   onReservationClick,
   pois = [] as Poi[],
   onPoiClick,
@@ -545,8 +547,8 @@ export const MapView = memo(function MapView({
     </Marker>
   )), [pois, onPoiClick])
   const visibleReservations = useMemo(() => (
-    visibleRouteReservations(reservations, { visibleConnectionIds, showTransitRoutes })
-  ), [reservations, visibleConnectionIds, showTransitRoutes])
+    visibleRouteReservations(reservations, { visibleConnectionIds, showTransitRoutes, selectedDayId, days })
+  ), [reservations, visibleConnectionIds, showTransitRoutes, selectedDayId, days])
   // Real road geometry for car/bus/taxi/bicycle bookings (straight line until it loads/if it fails).
   const transportRoutes = useTransportRoutes(visibleReservations)
   // Dynamic padding: account for sidebars + bottom inspector + day detail panel