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/app/commands/mod.rs

@@ -697,6 +697,7 @@ inventory::submit!(crate::command::CommandRegistration {
         "PDFOSNAP",
         "UOSNAP",
         "FIELDDISPLAY",
+        "SURFACEASSOCIATIVITY",
         "FIELDEVAL",
         "PDFIMPORTMODE",
         "PDFIMPORTFILTER",

src/app/commands/styleprops.rs

@@ -1093,6 +1093,7 @@ impl OpenCADStudio {
                     | "DGNOSNAP"
                     | "UOSNAP"
                     | "FIELDDISPLAY"
+                    | "SURFACEASSOCIATIVITY"
                     | "PDFIMPORTMODE"
                     | "PDFIMPORTFILTER"
                     | "PDFIMPORTLAYERS"
@@ -1301,6 +1302,28 @@ impl OpenCADStudio {
                         }
                         return Some(self.finish_dispatch(cmd));
                     }
+                    if name == "SURFACEASSOCIATIVITY" {
+                        use crate::scene::model::sweep_model;
+                        let current = i16::from(sweep_model::surface_associativity());
+                        match value.as_deref().map(|v| v.trim().parse::<i16>().ok().filter(|v| (0..=1).contains(v))) {
+                            Some(Some(mode)) => {
+                                if current != mode {
+                                    sweep_model::set_surface_associativity(mode == 1);
+                                    self.save_config();
+                                }
+                            }
+                            Some(None) => {
+                                self.command_line.push_error(crate::t!("Requires 0 or 1 only.").as_ref());
+                                self.command_line.push_output(&format!("Enter new value for SURFACEASSOCIATIVITY <{current}>:"));
+                                self.pending_setvar = Some(name.clone());
+                            }
+                            None => {
+                                self.command_line.push_output(&format!("Enter new value for SURFACEASSOCIATIVITY <{current}>:"));
+                                self.pending_setvar = Some(name.clone());
+                            }
+                        }
+                        return Some(self.finish_dispatch(cmd));
+                    }
                     if name == "FIELDDISPLAY" {
                         let current = i16::from(crate::entities::field::display());
                         match value.as_deref().map(|v| v.trim().parse::<i16>().ok().filter(|v| (0..=1).contains(v))) {