ReservationOverlay was Leaflet-only: react-leaflet components, L.divIcon,
panes, useMap/useMapEvents. When the user switched the planner map to
Mapbox GL, the entire feature disappeared — no polylines, no endpoint
badges, no clickable IATA labels.
Add a matching overlay for the Mapbox renderer:
- New reservationsMapbox.ts with an imperative `ReservationMapboxOverlay`
class — mapbox-gl is imperative, so a React component wrapper would
fight its own lifecycle every render. The manager owns one GeoJSON
source + line layer for the arcs, one HTML `mapboxgl.Marker` per
endpoint badge, and one per flight stats label. It cleans itself up
when the map is rebuilt (style/token/3d toggle) or unmounted.
- Geometry helpers (great-circle arc, antimeridian split, haversine,
tz-aware duration math, label formatting) are copied from the Leaflet
overlay so both renderers produce the same lines. Great-circle is
useful even on the Mapbox globe because the mercator projection mode
still draws the short-way line, and the antimeridian split prevents
a NYC↔Tokyo flight from wrapping halfway around the planet.
- Flights / cruises get geodesic arcs; trains / cars get straight
lines. All four types get clickable endpoint badges with the
matching lucide icon; only flights render the rotating mid-arc stats
label (IATA → IATA · distance · duration) — same rule as the Leaflet
overlay.
- The stats label's rotation is recomputed on every `render` event by
projecting two points straddling the arc midpoint, which keeps it
parallel to the arc as the camera rotates/zooms on the globe.
- Visibility thresholds mirror the Leaflet overlay (per-type min pixel
distance before a line / endpoint label is worth drawing).
- MapViewGL now accepts the `reservations`, `visibleConnectionIds`,
`showReservationStats`, `onReservationClick` props that the Leaflet
MapView already took. `visibleConnectionIds` is honoured the same way
— the per-booking toggle in DayPlanSidebar controls which routes
appear, so switching the renderer doesn't lose that UX.
- Added a `mapReady` gate so the overlay can only add its source/layer
once the map's `load` handler has attached the other trip sources;
the gate resets on every style rebuild.
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