Dropdown

A menu button: a trigger that opens a role=menu of actions. Data-driven — you pass the items and salle renders the popup and handles open/close, keyboard, and dismissal. Unlike Select it has no chosen value; picking an item runs it and closes:

Dropdown(
  items = Seq(
    MenuItem("edit", "Edit", onSelect = () => edit()),
    MenuItem("dup", "Duplicate", onSelect = () => duplicate()),
    MenuDivider,
    MenuItem("del", "Delete", danger = true, onSelect = () => remove()),
  ),
  onSelect = key => log(key),
)("Actions")

Items are built with MenuItem(key, label, icon, disabled, danger, onSelect) and MenuDivider. Choosing an item runs its own onSelect and reports its key to the dropdown-level onSelect. It’s fully keyboard-driven (arrows skip dividers and disabled items with wrap, Home/End, Enter/Space, Escape refocuses the trigger, Tab closes), dismisses on outside click (via core useClickOutside), and carries the full aria-haspopup/expanded/activedescendant wiring. Submenus and hover-to-open are out of scope for now.