Resolved taxonomy configuration; a disabled one yields null.
GeoLeaf layer id, or null to read it off the feature.
The feature whose taxonomy entry is resolved.
null when taxonomy is disabled, the layer id is unknown, or the layer
is not bound to any taxonomy.
Resolves a feature against its layer's taxonomy: the binding, plus the category and sub-category entries its column values land on.
The single entry point behind
resolvePoiIcon,resolveTitleIconand the badge resolver — they differ only in what they do with the result.