Shubz284/Nexus-app ? reverse-engineered prompt

Build me a full stack personal second brain app where people can sign up, log in with email or Google, and save useful stuff they find online in one place.

I want a clean dashboard where users can collect links from YouTube, social posts, and other web pages, see a preview, search by title or tags, and organize everything easily. Add a private notes area where users can create, edit, pin, color code, tag, and search notes. Add a documents area where users can upload PDFs and Word files, manage them, pin them, and search through them too.

Please also make it possible to share a saved collection with a public link. If possible, add a simple AI helper that gives a short explanation or summary when searching the saved content. Include a Chrome extension so users can quickly save the page they are on without leaving the tab. Keep the UI responsive and modern, and look up current docs online if you need to.