kde/katomic — reverse-engineered prompt

Build me a small desktop puzzle game called KAtomic that feels fun and educational. The core idea should be sliding atoms around a board to assemble the right molecule for each level, so it plays like a chemistry puzzle game that is easy to pick up even if the player is not very technical.

I want it to load level packs from simple INI style files, with basic info like the pack name, description, author, and number of levels, plus each level’s board layout, atom definitions, and target molecule. Please use the atom and bond encoding described in the project docs, and include support for the provided levels, themes, and icons so it feels like a complete app.

Make the game polished enough to browse level sets, start a level, solve puzzles, and switch themes. Keep it as a normal Linux desktop app with clean code and sensible defaults. Look up current docs online if you need to.