M0: desktop app: toolbar, browser, timeline, GPU viewport, view cube, sketch tools, dialogs, control channel

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

crates/render/src/raster.rs

@@ -219,6 +219,7 @@ mod tests {
             triangles: vec![[0, 1, 2]],
             tri_face: vec![0],
             edges: vec![],
+            seams: vec![],
         };
         let scene =
             Scene { meshes: vec![SceneMesh { mesh: Arc::new(mesh), color: Rgb(200, 30, 30) }], lines: vec![], background: None, radius: 20.0 };