Function resolve_vector_xaml 

pub fn resolve_vector_xaml(name: &str) -> Option<PathBuf>

Resolve a vector name to its staged XAML geometry (docs/vectors.md), the form day-xaml draws as real Path geometry: vector at any size, and tintable by brush at runtime. DAY_VECTOR_XAML_ROOT under day launch, else vectors/xaml beside a flat-layout exe. None (name isn’t a vector, the art was outside the convertible subset, or the layout carries no geometry) means fall back to resolve_image_file’s raster resolution.