refactor(text): let acadrust carry the rotation through a transform

The merged fix added the rotation update on this side, matching only
`EntityTransform::Rotate`. That left `Affine` -- which several entity
paths and the UCS world transform emit -- still dropping the angle, and
it sat against the contract this crate already relies on: MIRROR is
delegated precisely because acadrust's entity-aware paths "handle
direction flags, stored-angle conventions and bulges themselves", and
`mirror_text` did exactly that for the same field.

Moved upstream (acadrust 9ecaffc), where one helper carries the angle for
every entity that keeps one. That covers rotation, affine and reflection
in a single place, and closes the same gap for SHAPE and the ATTRIB pair,
which a rotation left facing the old way too -- attributes noticeably so,
since INSERT already turned itself while its attributes did not.

Co-Authored-By: Claude Opus 5 <[email protected]>

src/entities/mtext.rs

@@ -554,11 +554,6 @@ fn apply_transform(t: &mut MText, tr: &EntityTransform) {
         let line_angle = dy.atan2(dx);
         entity.rotation = 2.0 * line_angle - entity.rotation;
     });
-    // Keep MTEXT's explicit rotation in sync with ROTATE / ALIGN.
-    if let EntityTransform::Rotate { angle_rad, .. } = tr {
-        t.rotation =
-            (t.rotation + *angle_rad).rem_euclid(std::f64::consts::TAU);
-    }
 }
 
 impl TruckConvertible for MText {

src/entities/text.rs

@@ -484,12 +484,6 @@ fn apply_transform(t: &mut Text, tr: &EntityTransform) {
         entity.rotation = 2.0 * line_angle - entity.rotation;
         entity.oblique_angle = -entity.oblique_angle;
     });
-    // The generic entity transform moves the TEXT geometry, but acadrust
-    // does not update the DXF rotation field used by our text renderer.
-    if let EntityTransform::Rotate { angle_rad, .. } = tr {
-        t.rotation =
-            (t.rotation + *angle_rad).rem_euclid(std::f64::consts::TAU);
-    }
 }
 
 impl TruckConvertible for Text {