fix(polyline): render fill mode boundaries

Use kernel-produced band outlines when FILLMODE is off. Preserve centerline linetype stations through inserts, clipping, projection, and PDF export.

Cargo.lock

@@ -878,7 +878,7 @@ checksum = "fc652a48c352aef3ea3aed32080501cf3ef6ed5da78602a020c991775b0aff04"
 [[package]]
 name = "cadkernel"
 version = "0.1.0"
-source = "git+https://github.com/HakanSeven12/cadkernel.git?rev=76de3b3#76de3b35e55a45f3ffb813c499cf3affe176351d"
+source = "git+https://github.com/HakanSeven12/cadkernel.git?rev=b2b1d4b#b2b1d4b0cd7def2d26a0d519991fc89a89f916d3"
 dependencies = [
  "acadrust",
  "cavalier_contours",