Om280/prompthub ? reverse-engineered prompt

Build me a web app called PromptHub that helps turn a rough idea into a polished prompt I can copy into ChatGPT, Claude, or Gemini.

It should ask only the important follow up questions first, let me choose how much detail I want, then generate a clean model specific prompt and let me refine it with actions like improve, shorten, expand, regenerate, or tweak the tone. I want a simple focused interface with a centered editor style layout, dark first design, history for past prompts, and a clear copy button as the main action.

Please also make it work with API keys for common providers, but fall back gracefully if a key is missing, and keep the keys server side only. If you need to, look up current docs online for the AI provider setup. Make it responsive on mobile, support keyboard shortcuts, and keep the whole flow fast and smooth from idea to final prompt.