AdithyaKammara/Smart-Assistant ? reverse-engineered prompt

Build me a polished web app called Riya, a smart assistant that feels like a real product, not a demo. I want users to sign up with email, chat with the assistant in real time, see answers stream in, and have every conversation saved to their account so they can come back later. The assistant should be able to answer from uploaded PDFs too, and when it uses the documents it should show citations in the reply so people can see where the answer came from.

I also want voice support, so users can talk into the mic and hear responses read aloud in the browser. Add a simple way for the assistant to check the current time when needed. Make it work well on desktop and mobile, with a clean light and dark theme, and include proper error handling, rate limiting, and basic safety checks. If you need to look up current docs online while building it, go ahead.