Function useMapSelectionBinding

Two-way binding between a mounted MapLibre layer set and the enclosing HonuaSelectionProvider:

• layer clicks toggle the clicked feature in the shared store;
• every store change (from the map or from non-map components) is mirrored onto MapLibre feature-state under stateKey, so paint expressions like ["case", ["boolean", ["feature-state", "selected"], false], …] respond.

Requires a map with on/off and setFeatureState (any MapLibre map). No-ops while the map is null or there is no enclosing HonuaSelectionProvider. StrictMode-safe: listeners and mirrored feature-state are fully removed on cleanup.