feat(noise): preserve segment lengths during displacement

The noise node previously displaced each path point's XYZ independently,
which stretched/compressed segments and produced kinked edges. After
displacement, re-project each point onto the sphere of radius
seg_lens[i-1] centered at the previous point — same pattern used by the
gravity node. Total path length is now preserved; noise bends the path
rather than stretching it.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Cargo.lock

@@ -117,6 +117,7 @@ dependencies = [
 name = "noise"
 version = "0.1.0"
 dependencies = [
+ "glam",
  "nodarium_macros",
  "nodarium_utils",
  "noise 0.9.0",