gaudimannan/trainease ? reverse-engineered prompt

Build me a desktop train ticket booking app in Java with a clean, modern looking GUI.

I want regular users to be able to search trains, book tickets, cancel bookings, and see seat availability and schedule updates without needing to refresh anything manually. Please include a simple login flow if needed, and make the screens easy to use for someone who is not technical.

Also add an admin area where I can add, update, and remove trains, and manage schedules and availability. Make sure the app handles bad input nicely, shows clear error messages, and feels polished rather than like a school project. Use a modern Swing based design with FlatLaf styling, and connect it to a cloud database so the data stays saved and updates in real time. If you need to check current docs for any setup details, go ahead and look them up online.