Co-authored-by: 砍砍 <git@qaq.wiki>
close AF-1663, AF-1756 - new global `ModalConfigContext` - new logic to judge whether inside modal - render `✕` for PageHeader back if inside modal - only enable `NavigationGesture` when there is `<` in PageHeader
Co-authored-by: EYHN <cneyhn@gmail.com>