obrassard/HomeSentry ? reverse-engineered prompt

Build me a simple home security app that turns old phones into live camera feeds I can watch from a web dashboard.

I want a mobile app where I can log in, turn on the camera, and start streaming video from that phone. Then I want a website where I can sign in, see all the phones I’ve connected, and watch their live feeds in real time without refreshing the page. It should feel easy to set up, let me add multiple devices to one account, and only show me my own cameras after I’m logged in.

Please make the whole thing polished enough to demo, with a clean dashboard, basic authentication, and live video working end to end. If you need to check current docs for anything, go ahead and look them up online.