fix(dimension): land DXF round-trip fixes (re-pin acadrust)

Re-pins acadrust to the dimension DXF round-trip fixes (rotation/text/oblique
degree<->radian units, radial/angular/ordinate group codes, ordinate X/Y bit)
and drops the OCS-side fix_dxf_dimension_rotations dimension arm, which now
lives in the acadrust DXF reader (keeping it here would double-convert).

Completes the dimension audit (Batch 5). Refs #181.

Co-Authored-By: Claude Opus 4.8 <[email protected]>

Cargo.lock

@@ -71,7 +71,7 @@ checksum = "366ffbaa4442f4684d91e2cd7c5ea7c4ed8add41959a31447066e279e432b618"
 [[package]]
 name = "acadrust"
 version = "0.4.0"
-source = "git+https://github.com/HakanSeven12/acadrust?branch=main#7c0c12fe2801cf6c8e5a93ea3d7527afc62f3513"
+source = "git+https://github.com/HakanSeven12/acadrust?branch=main#ad507470661689a85a999166daf7f22ee507e63c"
 dependencies = [
  "ahash 0.8.12",
  "anyhow",
@@ -3410,7 +3410,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0b577e2d69827c4740cba2b52efaad1c4cc7c73042860b199710b3575c68438d"
 dependencies = [
  "bytecount",
- "memchr 2.8.2",
+ "memchr 1.0.2",
  "nom 8.0.0",
 ]
 

src/io/mod.rs

@@ -16,7 +16,7 @@ pub mod patterns;
 pub mod update_check;
 
 use crate::scene::DerivedCaches;
-use acadrust::entities::{Dimension, EntityType};
+use acadrust::entities::EntityType;
 use acadrust::io::dwg::DwgReader;
 use acadrust::{CadDocument, DwgWriter, DxfReader, DxfWriter};
 use std::path::{Path, PathBuf};
@@ -856,9 +856,9 @@ fn fix_viewport_status_flags(doc: &mut CadDocument) {
 fn fix_dxf_dimension_rotations(doc: &mut CadDocument) {
     for entity in doc.entities_mut() {
         match entity {
-            EntityType::Dimension(Dimension::Linear(d)) => {
-                d.rotation = d.rotation.to_radians();
-            }
+            // Dimension angles (rotation / text / oblique) are converted
+            // degrees->radians inside the acadrust DXF reader now, so a
+            // dimension arm here would double-convert.
             EntityType::AttributeDefinition(a) => {
                 a.rotation = a.rotation.to_radians();
             }