cdc-sys/level-thumbs-mod — reverse-engineered prompt

Build me a C++ mod called LevelThumbnails for this repo. The goal is simple: when a player is browsing levels, each level row or cell should show a small thumbnail image so the list feels more visual and easier to scan. Use the existing mod setup, resources, logo, metadata, and build files already in the project. Keep it lightweight and stable, and don’t change unrelated UI behavior.

If the game or modding API already has a way to get a level preview image, use that. If not, make a clean placeholder thumbnail system that can be filled in later, and make sure missing thumbnails don’t crash anything. The thumbnail should fit neatly inside the level cell, not cover the title, creator, buttons, or stats. Please add any needed resource files and hook the UI code in the right place. Look up the current modding docs online if you need to.