Dryxio/ariane ? reverse-engineered prompt

Build me a modern map editor for GTA III, Vice City, and San Andreas.

I want an app where I can open a game map, place, move, rotate, and delete objects, then save the edits back out cleanly. It should feel easy to use, with search and favorites for objects, thumbnail previews, 3D previews before placing things, and the ability to copy, cut, paste, and undo changes. Please include snapping, exact transform editing, a 3D gizmo for moving things around, and options to align objects to the ground.

It should also support prefabs, custom DFF models and TXD textures, and let me save changes either into the original game files or into a separate mod folder. If possible, add the game testing workflow too, so I can launch and check changes in game, and hot reload San Andreas edits when supported. Look up current docs online if you need to, and build it so it works across the three games as smoothly as possible.