pub fn extract_borders(main: &mut World, render: &mut World)Expand description
Extract fn that emits one ExtractedBorder per main-world entity
carrying a Transform and a Visuals::border. A border paints
even when the entity has no background fill (CSS: background: none; border: 1px solid ... still draws the border). Logical border edges
(border-inline-*) are resolved against the entity’s
crate::components::ResolvedDirection.