mapeditor/tiled ? reverse-engineered prompt

Build me a desktop tile map editor for 2D games. I want something like a flexible map making tool for RPGs, platformers, and similar tile based games, with a clean interface that feels usable right away. Users should be able to create maps of any size, choose any tile size, add as many layers as they want, and place both tiles and objects on the map. Maps, layers, tiles, and objects should all support custom properties so people can store gameplay data in the editor.

Please support the TMX map format and let a map use multiple tilesets at once. Tilesets should stay editable after they are added to a project. Make sure opening, editing, and saving maps works reliably, and keep the project buildable as a native app for the major desktop operating systems using the existing setup in the repo. If there are examples, docs, or tests already here, use them to stay consistent. Look up current docs online if you need to.