Display tessellation plans (4/4): one GPU dispatch for the scene, intersection edges by Newton (#806)

Packs the scene's planned bodies into one GPU upload and dispatch, and evaluates intersection edges by seeded Newton refinement from a fitted B-spline through exactly solved leader points, falling back to the previous evaluation near tangency. Intersection nodes carry their faces' parameters. This changes speed, not what the app draws.

Part 4 of 4 of #303.

Co-authored-by: jyviko <2501648+jyviko@users.noreply.github.com>

crates/kernel/src/tess/uv.rs

@@ -33,7 +33,7 @@ pub(crate) fn domain(s: &EvalSurface) -> Domain {
 }
 
 impl Domain {
-    fn clamp(&self, uv: [f64; 2]) -> [f64; 2] {
+    pub(crate) fn clamp(&self, uv: [f64; 2]) -> [f64; 2] {
         let mut out = uv;
         for (d, x) in out.iter_mut().enumerate() {
             if let (Some((a, b)), None) = (self.range[d], self.period[d]) {