feat(display): add model lineweight scale

src/scene/view/render.rs

@@ -3847,7 +3847,9 @@ impl Scene {
             full_bounds,
             self.document.header.lineweight_display || display_plot_lineweights,
         );
-        if self.current_layout != "Model" {
+        if self.current_layout == "Model" {
+            uniforms.lineweight_scale = self.model_lineweight_scale;
+        } else {
             let paper_per_pixel = 2.0 * self.camera.borrow().ortho_size() / canvas.1.max(1.0);
             let paper_units_per_mm = self.paper_space_unit_factor() as f32;
             uniforms.lineweight_scale = paper_units_per_mm / paper_per_pixel / MM_TO_PX;