smidr.overlays

..
UIContextMenu	A popup menu shown on `UIRoot.popupLayer` behind a click-blocking backdrop. Used by `UIMenuBar` dropdowns and directly for right-click context menus. Escape or an outside click closes it; selecting an item closes then runs its callback.
UIToast	Transient status messages: slide up near the bottom of the viewport, hold, then fade out. One shared instance; a new message replaces the current one immediately.
UITooltip	The shared hover tooltip. `install()` hooks it into `UIRoot`'s hover-delay driver; any widget with a `tooltip` (and optional `tooltipShortcut`, rendered right-aligned) gets one for free. One instance, idle-free, fades via `UITween`.