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 <[email protected]>

src/entities/solid3d.rs

@@ -6,13 +6,36 @@
 // fallback stays in sync; the caller (scene/mod.rs apply_grip) translates
 // the MeshModel vertices to match.
 
-use acadrust::entities::{Body, Region, Solid3D};
+use acadrust::entities::{Body, Region, Solid3D, Surface};
 use glam::Vec3;
 
+use crate::command::EntityTransform;
 use crate::entities::common::{center_grip, ro_prop as ro};
-use crate::entities::traits::{Grippable, PropertyEditable};
+use crate::entities::traits::{Grippable, PropertyEditable, Transformable};
 use crate::scene::model::object::{GripApply, GripDef, PropSection};
 
+/// Shared transform for the ACIS volume entities. Translate / rotate / scale
+/// delegate to acadrust (which composes the move into the solid's ACIS
+/// placement), and mirror delegates via a reflection transform. Without this
+/// the entity dispatcher treated solids as non-transformable, so a moved or
+/// pasted solid stayed at its original ACIS placement.
+macro_rules! impl_acis_transformable {
+    ($ty:ty) => {
+        impl Transformable for $ty {
+            fn apply_transform(&mut self, t: &EntityTransform) {
+                crate::scene::view::transform::apply_standard_entity_transform(self, t, |e, p1, p2| {
+                    let m = crate::scene::view::transform::reflection_about_xy_line(p1, p2);
+                    acadrust::Entity::apply_transform(e, &m);
+                });
+            }
+        }
+    };
+}
+impl_acis_transformable!(Solid3D);
+impl_acis_transformable!(Region);
+impl_acis_transformable!(Body);
+impl_acis_transformable!(Surface);
+
 // ── shared helpers ────────────────────────────────────────────────────────────
 
 fn dvec3(v: &acadrust::types::Vector3) -> glam::DVec3 {

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,
             ],
             _ => {},
         )