KDE/katomic — reverse-engineered prompt

Build me a small desktop puzzle game called KAtomic. I want it to feel like a fun educational chemistry game where the player solves levels by arranging atoms on a grid so they form the correct molecule. Include a good set of built in levels, simple polished visuals with theme support, and basic screens for starting the game, picking a level set, and changing settings like theme or language if translations are available.

Please make it load custom level packs from easy ini style files so people can add new puzzles without changing code. Each level should be able to describe the board layout, the atoms and bonds, and the target molecule, and the game should clearly detect when the puzzle is solved. Keep the project clean and easy to build with CMake, and make it feel like a proper Linux desktop app with icons and app metadata. If anything about the level format is unclear, look at the included level files and current docs online.