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 <[email protected]>

src/app/update/file.rs

@@ -678,6 +678,7 @@ impl OpenCADStudio {
             image_frame: crate::scene::frame::profile_image_mode(),
             attdef_on_screen: crate::modules::draw::draw::attdef::session().on_screen,
             field_display: crate::entities::field::display(),
+            surface_associativity: crate::scene::model::sweep_model::surface_associativity(),
             ncopy_bind: self.ncopy_bind,
             cursor_type: self.cursor_type,
             crosshair_color: self.crosshair_color,
@@ -787,6 +788,7 @@ impl OpenCADStudio {
         crate::scene::frame::set_profile_image_mode(s.image_frame);
         crate::modules::draw::draw::attdef::session().on_screen = s.attdef_on_screen;
         crate::entities::field::set_display(s.field_display);
+        crate::scene::model::sweep_model::set_surface_associativity(s.surface_associativity);
         self.ncopy_bind = s.ncopy_bind;
         self.cursor_type = s.cursor_type;
         self.crosshair_color = s.crosshair_color;