Enhancement: Retain layers when copying multiple objects

Replicate

0. Create a new drawing
1. Open the Layers panel
2. Add a new layer (e.g., LayerA)
3. Add a new layer (e.g., LayerB)
4. Add an object to LayerA (e.g., CircleA)
5. Add an object to LayerB (e.g., CircleB)
6. Ensure LayerA is selected
7. Select both objects
8. Copy the objects
9. Paste the objects

Expected Results

- LayerA has CircleA and a copy of CircleA.
- LayerB has CircleB and a copy of CircleB.

Actual Results

- LayerA has CircleA, and both copies.
- LayerB has CircleB.