fix: restore curve declaration after duplicate removal

src/brep/modeling.cpp

@@ -334,6 +334,7 @@ BrepModel fillet(const BrepModel& body, int edge_id, double radius) {
     }
     if (face_b < 0) return body;  // No adjacent face found
 
+    const auto& curve = *edge.curve;
     // Compute face normals
     Vector3D n_a = compute_face_normal(body, face_a);
     Vector3D n_b = compute_face_normal(body, face_b);

src/brep/step_import.cpp

@@ -393,26 +393,7 @@ static int to_ref(const StepValue& v) { return (v.type == StepValue::Type::Ref)
 
 static bool is_omitted(const StepValue& v) { return v.type == StepValue::Type::Omitted; }
 
-// ─────────────────────────────────────────────────────────────
-//  AXIS2_PLACEMENT_3D → coordinate frame
-// ─────────────────────────────────────────────────────────────
-struct Placement3D {
-    Point3D origin = Point3D(0, 0, 0);
-    Vector3D axis = Vector3D(0, 0, 1);   // Z-axis (primary)
-    Vector3D ref_dir = Vector3D(1, 0, 0); // X-axis (secondary, optional)
-};
-
-static Placement3D decode_axis2_placement_3d(const StepEntity& ent) {
-    Placement3D p;
-    // Args: name, location (CARTESIAN_POINT ref), axis (DIRECTION ref, optional), ref_direction (DIRECTION ref, optional)
-    if (ent.args.size() >= 2) {
-        p.origin = to_point({}); // will be resolved later via reference
-        // Store refs for later resolution
-    }
-    return p;
-}
-
-// For internal use: we store placement's refs
+// For internal use: we store placement's reference frame
 struct ResolvedPlacement {
     Point3D origin = Point3D(0, 0, 0);
     Vector3D z_axis = Vector3D(0, 0, 1);