A trip command center with an AI planning companionTabiya turns a conversation into a living trip plan, keeping itineraries, booking confirmations, tasks, reminders, shared decisions, and on-trip answers together. I built it from a real multi-country planning workflow and evolved it into a multi-tenant product with a mobile-first PWA, a native iOS app, offline support, collaborative trip data, Gmail confirmation discovery, and an AI assistant that works against durable trip state instead of producing a one-off itinerary.