fix: render wipeout fills after wire pass so they correctly mask wires

Previously wipeout solid fills were part of the hatch pass (pass 1),
drawn before wires (pass 5), so all wires appeared on top of the
wipeout. This fix moves wipeout fills into a dedicated pass 6 that
runs after wires, so the background-colored polygon correctly covers
the lines/text beneath it — matching AutoCAD behaviour.

- Scene.wipeout_models() separated from synced_hatch_models()
- Primitive.wipeout_hatches populated via wipeout_models()
- Pipeline.gpu_wipeouts + upload_wipeouts() + pass 6 after wires

Co-Authored-By: Claude Sonnet 4.6 <[email protected]>

src/scene/render.rs

@@ -27,6 +27,8 @@ pub struct CameraState {
 pub struct Primitive {
     pub(super) wires: Vec<WireModel>,
     pub(super) hatches: Vec<HatchModel>,
+    /// Wipeout fills — rendered in a separate pass AFTER wires.
+    pub(super) wipeout_hatches: Vec<HatchModel>,
     pub(super) images: Vec<ImageModel>,
     pub(super) meshes: Vec<MeshModel>,
     pub(super) uniforms: Uniforms,
@@ -60,6 +62,7 @@ impl<Msg: std::fmt::Debug + Clone> shader::Program<Msg> for Scene {
         Primitive {
             wires: all_wires,
             hatches: self.synced_hatch_models(),
+            wipeout_hatches: self.wipeout_models(),
             images: self.images.values().cloned().collect(),
             meshes: self.meshes.values().cloned().collect(),
             uniforms: Uniforms::new(&cam, bounds),
@@ -125,6 +128,7 @@ impl shader::Primitive for Primitive {
         pipeline.viewcube.ensure_depth_texture(device, size);
         pipeline.upload_uniforms(queue, &self.uniforms);
         pipeline.upload_hatches(device, &self.hatches);
+        pipeline.upload_wipeouts(device, &self.wipeout_hatches);
         pipeline.upload_images(device, queue, &self.images);
         pipeline.upload_meshes(device, &self.meshes);
         pipeline.upload_wires(device, &self.wires);