I've recently developed a LV/React bridge and am using it on a production app, but nothing open sourced at the moment. I'll open it up at some point soon and try and post back here!
If you like the idea of tailwind and don't want to look at utility classes and still want the power of styled-components or react-emotion I'd check out Chakra UI [0].
Nice work! I like the option to annotate with photos and notes! Have you guys checked out Spire? It's a free app, but could be paired with their hardware. It's different in that it's a really simple app for multitrack recording and editing, but I've also been using it for a similar function as Tape It. Not to take away from your work though, I will give the app a go :)
I've been building a Next.js app with a Django backend using django-rest-framework and dj-rest-auth. dj-rest-auth[1] handles auth and registration out of the box and takes no time to get up and running.