black674/transcripto — reverse-engineered prompt

Build me a polished SaaS style web app called Transcripto where someone can paste a YouTube video or playlist link and get the transcript, read it cleanly, and chat with an AI assistant about what was said in the video. I want it to feel modern and smooth, with a strong frontend experience, responsive layout, nice animations, toast messages, and clean pages for FAQ, Terms, and Privacy.

Please include sign up and login, protected profile and history pages, and subscription handling so free and paid usage can be supported. The app should save user history, support transcript based Q and A in real time, and connect the frontend to a lightweight backend with APIs for transcripts, auth, profiles, payments, and streaming chat.

Keep the backend simple but working, and make the frontend the star of the project. Make it feel production ready, with sensible loading, error, and empty states. If anything is unclear, check the docs in the repo and look up current docs online if needed.