Prepare 0.2.0 usability release and refresh desktop demo

apps/solvecraft-cli/src/main.rs

@@ -248,7 +248,7 @@ fn icon_png(size: usize) -> Result<Vec<u8>, String> {
         let mesh = body.mesh();
         scene.meshes.push(SceneMesh { mesh: std::sync::Arc::clone(&mesh), color: Rgb(90, 160, 240), face_colors: Vec::new() });
         for (i, e) in mesh.edges.iter().enumerate() {
-            if !mesh.seams.get(i).copied().unwrap_or(false) {
+            if mesh.shaded_edge_visible(i) {
                 scene.lines.push(SceneLine { points: e.clone(), color: Rgb(24, 52, 96), width: (3.0 * px).max(0.8), on_top: false });
             }
         }