Avoid using Plane with Handle

`Plane` is not an operation (i.e. it doesn't implement the `Operation`
trait), and I'm working on change that will restrict `Handle` to working
with operations.

experiments/2024-12-09/src/geometry/sketch.rs

@@ -10,7 +10,7 @@ pub struct Sketch {
 }
 
 impl Sketch {
-    pub fn to_face(&self, surface: Handle<Plane>) -> Face {
+    pub fn to_face(&self, surface: Plane) -> Face {
         let vertices = self
             .points
             .iter()

experiments/2024-12-09/src/model.rs

@@ -9,13 +9,13 @@ pub fn model() -> AnyOp {
         let sketch =
             Sketch::from([[-0.5, -0.5], [0.5, -0.5], [0.5, 0.5], [-0.5, 0.5]]);
 
-        let surface = Handle::new(Plane {
+        let surface = Plane {
             origin: Point::from([0., 0., 0.5]),
             coords: Bivector {
                 a: Vector::from([1., 0., 0.]),
                 b: Vector::from([0., 1., 0.]),
             },
-        });
+        };
 
         sketch.to_face(surface)
     };

experiments/2024-12-09/src/topology/connect.rs

@@ -39,9 +39,8 @@ impl ConnectExt for Handle<Face> {
             .half_edges()
             .zip(other.half_edges())
             .map(|([q, r], [t, s])| {
-                let surface = Handle::new(Plane::from_points(
-                    [q, r, s].map(|vertex| vertex.point),
-                ));
+                let surface =
+                    Plane::from_points([q, r, s].map(|vertex| vertex.point));
                 let face = Face::new(
                     surface,
                     [q, r, s, t].map(|vertex| vertex.clone()),

experiments/2024-12-09/src/topology/face.rs

@@ -12,13 +12,13 @@ use super::vertex::Vertex;
 
 #[derive(Debug)]
 pub struct Face {
-    surface: Handle<Plane>,
+    surface: Plane,
     vertices: Vec<Handle<Vertex>>,
 }
 
 impl Face {
     pub fn new(
-        surface: Handle<Plane>,
+        surface: Plane,
         vertices: impl IntoIterator<Item = Handle<Vertex>>,
     ) -> Self {
         Self {
@@ -41,7 +41,7 @@ impl Face {
 
     pub fn flip(&self) -> Self {
         Self {
-            surface: Handle::new(self.surface.flip()),
+            surface: self.surface.flip(),
             vertices: self.vertices.clone(),
         }
     }
@@ -50,7 +50,7 @@ impl Face {
         let offset = offset.into();
 
         Self {
-            surface: Handle::new(self.surface.translate(offset)),
+            surface: self.surface.translate(offset),
             vertices: self
                 .vertices
                 .iter()