fix: load designs off-thread and cache recent thumbnails as PNGs

crates/kernel/src/meshbody.rs

@@ -101,7 +101,14 @@ pub fn mesh_body(positions: &[Vec3], triangles: &[[u32; 3]]) -> Result<Body> {
             t.swap(1, 2);
         }
     }
-    Ok(Body { solid: Arc::new(crate::body::Solid::new_unchecked(Vec::new())), mesh: Some(Arc::new(out)), color: None, paint: None, splits: None })
+    Ok(Body {
+        solid: Arc::new(crate::body::Solid::new_unchecked(Vec::new())),
+        coarse_missing: None,
+        mesh: Some(Arc::new(out)),
+        color: None,
+        paint: None,
+        splits: None,
+    })
 }
 
 /// Wind every connected piece one way: a triangle that runs a side in the same direction as
@@ -185,6 +192,13 @@ impl Body {
                 t.swap(1, 2);
             }
         }
-        Some(Body { solid: self.solid.clone(), mesh: Some(Arc::new(out)), color: self.color, paint: self.paint.clone(), splits: self.splits.clone() })
+        Some(Body {
+            solid: self.solid.clone(),
+            coarse_missing: None,
+            mesh: Some(Arc::new(out)),
+            color: self.color,
+            paint: self.paint.clone(),
+            splits: self.splits.clone(),
+        })
     }
 }