public static RightSidebarState ReduceRightSidebarExistsAction(RightSidebarState state, RightSidebarExistsAction action) => new RightSidebarState(action.Exists, state.IsDisplay);
public static RightSidebarState ReduceToggleRightSidebarAction(RightSidebarState state, ToggleRightSidebarAction action) => new RightSidebarState(state.Exists, !state.IsDisplay);