YouBTech01/YouBGram_WebApp ? reverse-engineered prompt

Build me a modern social media web app called YouBGram that feels fast like a mobile app and works as a progressive web app.

I want users to be able to sign up, log in, post images or videos, comment, chat in real time, and manage their profile photo and posts. It should have a clean creator friendly home feed, protected pages for logged in users, and an admin area with stronger security. Please make it work with a Node and React setup, use a simple local database, and keep uploaded media stored safely so it does not get lost when the app is updated.

Also make the public pages SEO friendly, so profile pages and post pages can show the right title and description when shared. Add offline support, caching, and install behavior like a real PWA. If you need current docs for anything, look them up online first.