Portree-Kid/terramaster — reverse-engineered prompt

Build me a small desktop app called TerraMaster for FlightGear. I want a simple GUI where I can point it at my FlightGear scenery folder, browse scenery on a map, and manage which scenery collections or regions I have installed. It should feel like a practical scenery manager, with an obvious Settings button, saved preferences in a terramaster.properties file, and a runnable jar so I can just launch it with Java and use it.

Please make it build cleanly with Maven and package as terramaster.jar. If it makes sense for this project, include map based lookup for airports and nav aids, plus basic world or coastline data so it is easy to understand what area I am looking at. Keep the interface straightforward rather than flashy, and make sure the app starts reliably and is easy for a normal FlightGear user to set up. Look up current docs online if you need to.