feat(sweep): associative swept surfaces in the drawing's network

Swept surfaces made with SURFACEASSOCIATIVITY on keep their profile and
path and are written as a swept-surface action of the drawing's
associative network, reading the profile and path and their scale and
twist expressions. They follow edits of their sources.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/scene/mod.rs

@@ -3677,6 +3677,11 @@ impl Scene {
                     changes.push(change);
                 }
             }
+            for change in self.refresh_associative_sweeps(&changes) {
+                if !changes.iter().any(|(handle, _)| *handle == change.0) {
+                    changes.push(change);
+                }
+            }
             if solve_parametric && !self.parametric_constraints.is_empty() {
                 for change in self.refresh_parametric_constraints_with_initial_policy(
                     &changes,