feat(mline): render multilines from their MLINESTYLE + complex linetypes

Multilines were drawn with a fixed ±scale/2 two-line guess in the entity
colour, ignoring the MLINESTYLE entirely, so a drawing's custom style (per-
element offsets, colours and linetypes) was lost — a red/yellow multiline
rendered as a white box.

- mline.rs: resolve the MLINESTYLE (by style_handle, then name) and build one
  parallel line per element from its offset x scale + justification shift.
- tessellate.rs: special-case MLINE (like Leader) to emit one WireModel per
  element in the element's own colour, CPU-dashing every element through
  apply_along so the parallel lines stay in phase.
- linetypes.rs: render a drawing's OWN complex linetypes (embedded text/shape),
  document definition first and the bundled .lin catalog only as a fallback, so
  a file-defined text linetype like PLYN shows its text.
- Run the dash/glyph layout in a local frame (f64 origin subtracted, re-split to
  double-single after) so spacing stays precise at UTM coordinates, and pass
  tracking = 1.0 so embedded text keeps its letter spacing.

Cargo.lock pins acadrust to the MLINE->MLINESTYLE handle-link reader fix.

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

Cargo.lock

@@ -73,7 +73,7 @@ checksum = "366ffbaa4442f4684d91e2cd7c5ea7c4ed8add41959a31447066e279e432b618"
 [[package]]
 name = "acadrust"
 version = "0.4.0"
-source = "git+https://github.com/OpenAEC-Foundation/acadifc?branch=main#a7f4741eb9dbcc8f44170eca3a5c85143b6cf432"
+source = "git+https://github.com/OpenAEC-Foundation/acadifc?branch=main#ecd1ac82985cfef77af54cb37b1b50bcdb29b7c1"
 dependencies = [
  "ahash 0.8.12",
  "anyhow",