The main popover component that manages state and positioning.
:id - Required unique identifier for the popover.:open - Whether the popover is initially open. Defaults to false.:use-portal - Whether to move content outside its root while open. Defaults to false.:portal-container - CSS selector for portal target. Used only when :use-portal is true.:on-open - Handler for popover open event.:on-close - Handler for popover close event.:class - Additional CSS classes.:on-open - Fired when the popover opens.:on-close - Fired when the popover closes.