nathanpikelny6-oss/CineOS ? reverse-engineered prompt

Build me a polished browser movie app called CineOS that feels like a simple streaming site. I want a clean home screen, a real movie list, nice poster style cards, and a player experience that can use the local video files already in the project. Please make the split screen feature actually work so I can watch or compare two videos side by side, and tidy up the folders and scripts so the project feels organized and easy to run.

There are a few unfinished things in the repo, like the proxy and any AI related bits, so either fix them in a basic practical way or remove broken parts so the whole app works from start to finish. Keep it lightweight with plain web tech, but give it a much better visual design, smoother interactions, and a few small extra features that make it feel more complete. If you need to, look up current docs online.