Sarthak2845/RoamIO — reverse-engineered prompt

Build me an AI travel agent web app called RoamIO. I want a clean travel planning page where someone can type where they want to go, dates, budget, number of travelers, travel style, and things they like, then the app generates a practical day by day itinerary in plain language. It should include suggested activities, food ideas, neighborhoods or areas to stay in, rough timing, estimated costs, and simple tips like weather, safety, and what to pack when possible. Let users revise the plan with follow up requests, save or copy the trip, and start a new one easily.

Please make the frontend feel modern and friendly, with loading states and helpful empty states. Set up the backend to call an AI model through environment variables, with clear placeholders if keys are missing. Keep everything in TypeScript, wire the frontend and backend together, and add basic setup instructions so I can run it locally. Look up current docs online if needed.