Merge PR #1279 and complete parametric UI actions

src/app/update/mod.rs

@@ -4329,6 +4329,13 @@ impl OpenCADStudio {
                 }
                 let i = self.active_tab;
                 self.tabs[i].scene.selection.borrow_mut().context_menu = None;
+                // A selected constraint-glyph pill takes Delete before entity
+                // erase — the two selections are mutually exclusive (see
+                // `Scene::selected_constraint`).
+                if let Some(id) = self.tabs[i].scene.selected_constraint {
+                    self.delete_parametric_constraint(id);
+                    return Task::none();
+                }
                 let handles: Vec<_> = self.tabs[i].scene.selected.iter().cloned().collect();
                 if !handles.is_empty() {
                     // Erase is delta-safe unless a target is in a group (group
@@ -6263,7 +6270,6 @@ impl OpenCADStudio {
                 self.refresh_properties();
                 Task::none()
             }
-
             // ── Options / About windows ───────────────────────────────────
             Message::OptionsOpen => {
                 self.active_modal = Some(super::ModalKind::Options);