Haven't tried lovable yet for anything Nostr related. I was able to get v0.dev to allow a user to login via a browser extension and display their feed. I tried getting it to work with nostr-sdk js bindings, but in the end nostr-tools is all I could get working (maybe it's been around longer and was in the training data of the LLM; although I did try dumping many examples of nostr-sdk js code).

I'm curious which Nostr features you got working?