swayam-rajput/athos ? reverse-engineered prompt

Build me a social site called Linkun where people can share and organize the digital content they love. I want users to be able to sign up with email or Google, set up a profile with a photo, bio, display name, and a username that can only be changed once. They should be able to save links, have the app pull in the page title, description, and icon automatically, and group links into named collections with privacy controls for both individual links and whole collections.

I also want a discovery area where people can find interesting curators, follow them, search by username or display name, and rate profiles from 1 to 5 stars with an average score shown. Make it feel polished and modern, with a clean social feed style, smooth animations, and good mobile layout. Use the existing database and auth setup if needed, and look up current docs online if you need to.