Function resolve_styled_item_spans 

pub fn resolve_styled_item_spans(
    spans: &[(usize, usize)],
    decoder: &mut EntityDecoder<'_>,
) -> FxHashMap<u32, GeometryStyleInfo>

Resolve geometry-attached styled-item spans into a style index — the defer-mode replay (fast_first_batch), and the building block resolve_prepass uses internally.