Mail client app shell with folder sidebar, split list and reading panes, and icon app rail

reui/app-shell-20

Email workspace: inset Sidebar with account menu, compose dialog, folders, labels and contacts, a search and category-filter message list, a reading pane, and a right icon rail. shadcn Sidebar, Card, Empty, Dialog, ReUI Badge. Mail inbox, webmail UI.

Paid component: its registry needs a licence from the library, so install it from their site.