[Royalroad] Wrap authors notes in "details" tag

[Palloxin]

Describe your suggested feature

Author notes can be... immersion-breakers. Some do not like them, some instead favor them.
To meet both preferences, wrapping the author notes in details html tag would be the IDEAL solution.

Other details

YouCut_20250704_201954867.mp4

Acknowledgements

• I have searched the existing issues and this is a new ticket, NOT a duplicate or related to another open issue.
• I have written a short but informative title.
• If this is an issue with the app itself, I should be opening an issue in the app repository.
• I have updated the app to version 1.1.19.
• I will fill out all of the requested information in this form.

[Palloxin]

I suggest to implement this feature ONLY after beta 4 gets released since the details and summary tags will be allowed by the sanitizer only after that version.