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.

src/scene/text/complex_lt.rs

@@ -311,6 +311,7 @@ pub fn apply_along(
         .map(|pts| WireModel {
             point_marker: None,
             taper_widths: Vec::new(),
+            pattern_stations: Vec::new(),
             world_width: 0.0,
             depth_override: None,
             display_visible: true,
@@ -358,6 +359,7 @@ pub fn apply_along(
         out.push(WireModel {
             point_marker: None,
             taper_widths: Vec::new(),
+            pattern_stations: Vec::new(),
             world_width: 0.0,
             depth_override: None,
             display_visible: true,