Stacked alert banners for pending organization invitations.
Rendered by LayoutWrapper when pk_pending_invitations is assigned
via PhoenixKitWeb.Hooks.InvitationHook.
Events are forwarded to the parent LiveView which must have the
InvitationHook attached to handle accept_invitation / decline_invitation.
Summary
Functions
Renders a stacked list of invitation banners, one per pending invitation.