fix(point): preserve relative marker sizing

Keep rendering, picking, block transforms, and plotted output on the
same viewport-relative PDSIZE geometry without overloading wire width
fields.

src/modules/model/primitive_cmd.rs

@@ -511,6 +511,7 @@ inventory::submit!(crate::command::CommandRegistration {
 
 fn wire(name: &str, points: Vec<[f32; 3]>) -> WireModel {
     WireModel {
+        point_marker: None,
         taper_widths: Vec::new(),
         world_width: 0.0,
         depth_override: None,