withspectrum/spectrum ? reverse-engineered prompt

Build me a modern online community app like Spectrum, where people can create communities, join discussions, and chat in a forum style space at the same time.

I want the main experience to feel simple and fast, with threaded conversations by default, clear community pages, user profiles, private messaging or real time discussion, and good moderation tools so admins can manage members and keep things healthy. Please make it a full working product, not just a landing page, with sign in, community browsing, posting, replying, notifications, and basic admin controls. It should have a clean React frontend, a Node backend, and a GraphQL API, with the data stored in a database and background jobs where needed. Use the existing project structure if possible, and keep the codebase organized and readable. If you need current library docs or best practices, look them up online first and then implement it.