Analytics: redesigned delivery insights

Statistics is now called Analytics, and it's out of public preview. Delivery insights now live in one place: an order journey timeline (fulfillment → carrier handover → transit, per carrier and against the platform average), reliability cards showing first-attempt rate, exceptions, returns and stuck parcels per carrier, and a destination leaderboard with a country × carrier matrix that recommends the best carrier per destination. Tracking now shows just the shipments that need your attention, and active shipments refresh every 4 hours instead of once a day.