ditpowuh/chat-beyond — reverse-engineered prompt

Build me a simple web app that feels like a lightweight alternative to ChatGPT, using the OpenAI API and a familiar chat style interface. I want it to be easy for a normal person to open, paste in their API key in settings, pick from supported OpenAI models, and start chatting right away.

Please make conversations and app data save locally in an easy to find place, and show a rough input cost estimate based on tokens and model pricing. The chat should handle normal text well, render code nicely, and display images in the conversation. It should also let people attach files, especially images, PDFs, text files, code files, and csv files, with the same basic limits described in the project. Keep it lightweight, clean, and simple to use, with most settings editable inside the app instead of making people edit config files.

If it already has Bun and Node support in mind, keep that working. Look up current OpenAI docs online if you need to.