Simplify `GlobalPath` transforms

It's not an object, so it doesn't make much sense to include it with the
transformation infrastructure of objects.

crates/fj-kernel/src/algorithms/transform/mod.rs

@@ -4,7 +4,6 @@ mod curve;
 mod cycle;
 mod edge;
 mod face;
-mod path;
 mod shell;
 mod sketch;
 mod solid;

crates/fj-kernel/src/algorithms/transform/path.rs

@@ -1,22 +0,0 @@
-use fj_math::Transform;
-
-use crate::{objects::Objects, path::GlobalPath, validate::ValidationError};
-
-use super::TransformObject;
-
-impl TransformObject for GlobalPath {
-    fn transform(
-        self,
-        transform: &Transform,
-        _: &Objects,
-    ) -> Result<Self, ValidationError> {
-        match self {
-            Self::Circle(curve) => {
-                Ok(Self::Circle(transform.transform_circle(&curve)))
-            }
-            Self::Line(curve) => {
-                Ok(Self::Line(transform.transform_line(&curve)))
-            }
-        }
-    }
-}

crates/fj-kernel/src/algorithms/transform/surface.rs

@@ -15,7 +15,7 @@ impl TransformObject for Handle<Surface> {
         objects: &Objects,
     ) -> Result<Self, ValidationError> {
         Ok(objects.surfaces.insert(Surface::new(
-            self.u().transform(transform, objects)?,
+            self.u().transform(transform),
             transform.transform_vector(&self.v()),
         ))?)
     }

crates/fj-kernel/src/path.rs

@@ -22,7 +22,7 @@
 //! [`Surface`]: crate::objects::Surface
 //! [#1021]: https://github.com/hannobraun/Fornjot/issues/1021
 
-use fj_math::{Circle, Line, Point, Scalar, Vector};
+use fj_math::{Circle, Line, Point, Scalar, Transform, Vector};
 
 /// A path through surface (2D) space
 #[derive(Clone, Copy, Debug, Eq, PartialEq, Hash, Ord, PartialOrd)]
@@ -141,4 +141,15 @@ impl GlobalPath {
             Self::Line(line) => line.vector_from_line_coords(vector),
         }
     }
+
+    /// Transform the path
+    #[must_use]
+    pub fn transform(self, transform: &Transform) -> Self {
+        match self {
+            Self::Circle(curve) => {
+                Self::Circle(transform.transform_circle(&curve))
+            }
+            Self::Line(curve) => Self::Line(transform.transform_line(&curve)),
+        }
+    }
 }