Complete spline fit and control grip modes

src/app/update/command.rs

@@ -1723,15 +1723,13 @@ pub(super) fn on_tab_close(&mut self, idx: usize) -> Task<Message> {
                         .get_entity(popup.handle)
                         .is_some_and(|entity| match (item.action, entity) {
                             (GripMenuAction::ShowFit, acadrust::EntityType::Spline(spline)) => {
-                                !spline.cv_frame_visible
-                                    && crate::entities::spline::uses_fit_method(spline)
+                                crate::entities::spline::shows_fit_points(spline)
                             }
                             (
                                 GripMenuAction::ShowControlVertices,
                                 acadrust::EntityType::Spline(spline),
                             ) => {
-                                spline.cv_frame_visible
-                                    || !crate::entities::spline::uses_fit_method(spline)
+                                crate::entities::spline::shows_control_vertices(spline)
                             }
                             _ => false,
                         });

src/app/view/mod.rs

@@ -591,7 +591,8 @@ bg={bg_ms:.1}ms n={view_count}"
             };
             let control_polygon = tab.selected_handle.and_then(|handle| {
                 let spline = match tab.scene.document.get_entity(handle) {
-                    Some(acadrust::EntityType::Spline(spline)) if spline.cv_frame_visible => spline,
+                    Some(acadrust::EntityType::Spline(spline))
+                        if crate::entities::spline::shows_control_vertices(spline) => spline,
                     _ => return None,
                 };
                 if tab