OptionalEnsureIdempotent loader for reference geometries. Optional for backwards compatibility.
OptionalLoadedTrue once the underlying engine has finished loading reference geometries.
Resolve a coordinate pair to its containing country and state/province.
Callers should await EnsureLoaded() first if the resolver lazy-loads.
Provides coordinate-based geographic resolution via point-in-polygon. Used by map components to resolve lat/lng to country/state for choropleth rendering.