feat(properties): refine quick properties

- Keep the floating panel near the selection and inside the viewport
- Persist the toggle and hide the panel without a selection
- Show only Material in 3D Visualization

src/app/update/mod.rs

@@ -3216,6 +3216,11 @@ impl OpenCADStudio {
             }
             Message::ToggleQuickProperties => {
                 self.quick_properties ^= true;
+                if self.quick_properties {
+                    self.quick_properties_anchor =
+                        self.tabs[self.active_tab].last_cursor_screen;
+                }
+                self.save_config();
                 Task::none()
             }
             Message::ToggleSelectionCycling => {
@@ -3226,12 +3231,19 @@ impl OpenCADStudio {
             }
             Message::CycleSelect(handle) => {
                 // Add the picked object to the current selection (accumulate).
+                let quick_properties_anchor = self
+                    .cycle_candidates
+                    .as_ref()
+                    .map(|(point, _)| *point);
                 self.cycle_candidates = None;
                 let i = self.active_tab;
                 self.tabs[i].scene.set_hover_highlight(None);
                 self.tabs[i].scene.select_entity(handle, false);
                 self.tabs[i].scene.expand_selection_for_groups(&[handle]);
                 self.refresh_properties();
+                if let Some(point) = quick_properties_anchor {
+                    self.quick_properties_anchor = point;
+                }
                 Task::none()
             }
             Message::CycleHover(handle) => {