fix(linetype): keep complex linetypes precise at large coordinates

A circle with a complex linetype (embedded shapes/text, e.g. IZOLACE) drew
its dashes and symbols scattered far off the entity at UTM-scale
coordinates. Two defects compounded, both catastrophic-cancellation at a
~1.2M-unit origin:

- The single-entity complex-linetype path fed apply_along the wire's HIGH
  double-single half only (`base.points`), an absolute f32 quantised to
  ~0.1 at 1.2M. Walking the pattern along those points blew the shape /
  dash positions up to ~1e308. Reconstruct the absolute f64 path from
  high+low, re-origin it at the first vertex, walk apply_along in that
  local frame, then lift each result wire back to world with
  shift_wire_to_world (now pub(crate)) — the same local-frame trick the
  MLINE complex-linetype path already uses. Fixes every entity, not just
  circles.

- The circle was tessellated with truck's circle_arc (arc-through-three-
  points), whose fit cancels catastrophically at 1.2M and returned a ~3%
  radius wobble with uneven segments. Tessellate directly as a cos/sin
  polyline (adaptive segment count from the curve tolerance); adding a
  small ±r term to the centre stays precise, and the Lines path RTE-splits
  it. Arc and polyline bulges share the circle_arc root and remain to fix.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/scene/convert/tessellate.rs

@@ -74,7 +74,7 @@ pub(crate) fn points_to_ds(
 /// The MLINE complex-linetype path uses this because `apply_along` lays out its
 /// dashes and glyphs in f32, which would otherwise quantise fine spacing far
 /// from the origin.
-fn shift_wire_to_world(w: &mut WireModel, origin: [f64; 3]) {
+pub(crate) fn shift_wire_to_world(w: &mut WireModel, origin: [f64; 3]) {
     if !w.points.is_empty() {
         let mut hi = Vec::with_capacity(w.points.len());
         let mut lo = Vec::with_capacity(w.points.len());