BookStackApp
Include "Add book to shelf" option in Book view
Adding a Book to a Shelf is non-intuitive
The only way to add an existing book to a shelf is by editing the shelf. A user is probably going to want to add a book to a shelf while working on or using the book itself, and so I would expect something in the book's UI menus to show an option to "add to shelf" option, but the only place where this exists is in the shelf "edit" menu - it's basically buried in there.
Include "Add Book to Shelf..." option in Book view
It would reduce UI friction and allow an easier experience when a user wants to add a book to a shelf.
We have had multiple users ask how to move books because they couldn't find the option to do it inside the book. It would also be a workaround for #3266 when you have many books.
