ShenSeanChen/launch-DeepResearch-Frontend ? reverse-engineered prompt

Build me a polished Next.js web app for an AI deep research tool.

I want a chat like interface where a user can paste a question and watch the research happen live, with streaming updates that show the thinking process, progress stages, and sources as they come in. It should feel modern, clean, and responsive on mobile and desktop, a bit like Perplexity or OpenAI thinking mode.

Please include support for switching between a few models, and a compare mode where I can run the same prompt across multiple models and see the results and timing side by side. I also want a simple way for users to enter and save API keys in the browser, plus an option to import and export them.

Make sure the app keeps research state when I move around the page, and add a nice export to Google Docs flow for the final report with sources formatted properly. If you need current API details, look up the latest docs online.