Add an "add all" furigana toggle (or rework how it's displayed)

Description of your request or bug report: It seems a bit silly to have to toggle furigana for each individual book provider, especially if there are 15 of them:

I would think it would only be special cases where a version of a book is sold with (or without furigana) at specific providers only. In that case, could a button be added that toggles all the furigana notations at once? Or move the furigana notation from the book provider list to somewhere else? Maybe in the “general info” section?

Trello link: (leave in blank)

I wonder if this is something that maybe would make sense to be rolled into the edition handling that I believe is one of the upcoming ‘to do’ items stated by Brandon :thinking: