Show active tracking reference tooltip

src/app/command_driver.rs

@@ -87,6 +87,7 @@ impl OpenCADStudio {
         self.snapper.from_point = None;
         self.snapper.clear_tracking();
         self.otrack_active = None;
+        self.otrack_kind = None;
         self.axis_lock_dir = None;
         self.dyn_user_reshaped = false;
         self.dyn_coord_absolute = false;