Pending tracking-number reservation summary (banner + dialog warning)

Pending reservation summary: {"requested_numbers": X, "open_tickets": N}.

requested_numbers is fulfillment-aware — per portal, entries on open reservation tickets minus active numbers of that portal attributed since the first open request — so the banner clears when the requested portals actually have numbers, without waiting for the admin to resolve the ticket. resolved/closed tickets never count (cancel path). Zero → banner hides.