[Suggestion] return to library button logic is not intuitive enough

[frankli998]

Please describe your suggestion, and the problem it'd solve.
Currently, the "return to library" button always return to homepage of LRR, but it's not intuitive enough. For example, I entered reading mode from page 10 of my whole collection, but when I returned to library, I ended up page 1. Same with category. Suppose I am viewing some category, I would like to return to that category after finish reading instead of just returning to homepage.

That is to say, return to library is better return to where I entered reading mode instead of directly go to homepage.

Additional context
Add any other context or screenshots about the feature request here.

[Difegue]

There have been a few requests for this; The way I'd implement it would be to save last search/sort in localStorage so that loading the index will automatically do the last search if no other URL parameters are specified.

[Difegue]

Left the localStorage idea on the table since it was much more annoying to implement and went for a referrer-based solution, which pulls the query parameters off the URL that led to the reader, and slaps them on the "return to index" button.

This is a bit of a naive solution, but the server will just ignore query parameters it doesn't know, so I don't think it'll bring any issues.