fix(3d): move and paste ACIS solids to the right place

Solids were missing from the entity transform dispatch, so move / rotate /
scale / mirror were silently no-ops on a 3D solid (only its wires shifted)
and a pasted solid stayed at its original location. Add a Transformable impl
for Solid3D/Region/Body/Surface (delegating to acadrust, which now composes
the move into the ACIS body placement) and register them in the dispatcher.

Also make cross-drawing paste land at the cursor: the clipboard centroid is
measured in the source drawing's offset-relative frame, so correct the paste
translation by the source/target world_offset difference (zero within one
drawing). Bumps acadrust for the solid-geometry transform fixes.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/entities/traits.rs

@@ -422,6 +422,7 @@ impl EntityTypeOps for EntityType {
                 Tolerance, Solid, Face3D, PolygonMesh, PolyfaceMesh, Mesh,
                 Table, MText, Point, Spline, Text, Viewport, Dimension,
                 Leader, MultiLeader, Underlay, Shape, Ole2Frame,
+                Solid3D, Region, Body, Surface,
             ],
             _ => {},
         )