KhanPalash/VideoGPT — reverse-engineered prompt

Build me a simple web app called VideoGPT using the existing TypeScript web app setup in this repo.

I want it to feel like a small AI tool where someone can add a video, either by uploading one or pasting a video link, then ask questions about it in a chat box. The app should show the selected video, a clean summary area, and a conversation panel where the user can ask things like “what is this video about” or “give me the main points.” If real video processing or AI keys are needed, wire it up with environment variables and make the missing setup obvious, but keep the app usable with a friendly placeholder response so it can still be demoed.

Please make the interface modern, simple, and responsive. Add sensible loading states, error messages, and empty states. Keep the code clean and easy to understand, and look up current docs online if you need to.