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]>

src/scene/text/complex_lt.rs

@@ -185,9 +185,12 @@ pub fn apply_along(
                             &mut atlas,
                             *tx_scale,
                             fwd_angle,
+                            1.0, // width_factor
+                            0.0, // oblique
+                            // tracking = 1.0 applies the font's natural
+                            // letter_spacing; 0.0 zeroes it and cramps the glyphs
+                            // (every other text path passes 1.0).
                             1.0,
-                            0.0,
-                            0.0,
                             style,
                             false,
                             &resolved,