fix programmatic split panel focus

Author: just-boris

src/app-layout/visual-refresh-toolbar/state/use-app-layout.tsx

@@ -222,7 +222,7 @@ export const useAppLayout = (
     openTools: () => onToolsToggle(true),
     focusToolsClose: () => drawersFocusControl.setFocus(true),
     focusActiveDrawer: () => drawersFocusControl.setFocus(true),
-    focusSplitPanel: () => splitPanelFocusControl.refs.slider.current?.focus(),
+    focusSplitPanel: () => splitPanelFocusControl.setLastInteraction({ type: 'open' }),
     focusNavigation: () => navigationFocusControl.setFocus(true),
   }));