Function get_title_category_rendering 

pub fn get_title_category_rendering(
    title_type: &TitleType,
    ref_type: Option<&str>,
    language: Option<&str>,
    config: &Config,
) -> Option<Rendering>

Resolve title-category-specific rendering overrides for a title component.

The returned rendering reflects title type, mapped reference category, and optional language-specific overrides from the style configuration.