A Mac OS 9 styled app shell layout with collapsible sidebar, context-driven open/closed state, menu items with azul active and lavender hover, keyboard shortcut (Cmd+B) toggle, and icon-only collapsed mode. Provides RetroSidebarProvider, RetroSidebar, RetroSidebarHeader, RetroSidebarContent, RetroSidebarFooter, RetroSidebarMenu, RetroSidebarMenuItem, RetroSidebarMenuButton, RetroSidebarGroup, RetroSidebarGroupLabel, RetroSidebarTrigger, and RetroSidebarInset.
pnpm dlx shadcn@latest add "https://nostalgia-ui.com/r/retro-sidebar.json"