I think this is cool, but 2 things... 

1. Will all nostr apps have opportunity on all views to add a comment? How does it look on the edge cases?

2. The bar actually looks big, especially on some of the other demo pages, I would suggest to reduce the rounded corners by at least 1/2.

I do like the idea that this becomes a best practice widget that any app can style however they feel looks best for their own apps but that users can get familiar with.