Browse library by Author with book counts

As a user with a large library (2,000+ books imported from Calibre), I'd like a dedicated Authors view that:

1. Lists all authors in my collection alphabetically
2. Shows the number of books per author
3. Lets me tap an author to see all their books

This is a standard feature in e-book managers like Marvin and mirrors how a physical library organizes bookshelves. Currently BookShelves can sort by author and search by author, but there's no grouped author index view.

Source: support email from user migrating from Marvin.