pub(crate) fn parse_mesh_size(s: &str) -> Result<(u32, u32), String>Expand description
Parse --mesh-size arg: accepts named presets (low, medium,
high, ultra) or an explicit COLSxROWS form (e.g. 64x48).
Returns the resolved (cols, rows). Values are clamped to MD2’s
[2, 192] × [2, 96] window downstream by MilkRenderer::set_mesh_size.