Open large designs faster: meshes, face names and Measure on all cores (#916)

Display meshes after opening, the face names read when a feature finds a face by name, and inspect.measure over all bodies are now worked out per body on plain scoped threads (solidcraft_kernel::for_each_on_threads / map_on_threads), in body order and with the same results; the browser build stays serial.

apps/solidcraft-cli/src/main.rs

@@ -431,6 +431,8 @@ fn cmd_bench_open(args: &[String]) -> Result<(), String> {
     }
     let t = std::time::Instant::now();
     let st = s.world_state();
+    // As the desktop app prepares a design it opened.
+    st.warm_meshes(|| true);
     let triangles: usize = st.bodies.iter().map(|b| b.mesh().triangles.len()).sum();
     println!("{}", json!({"step": "mesh", "ms": t.elapsed().as_secs_f64() * 1000.0, "bodies": st.bodies.len(), "triangles": triangles}));
     Ok(())