Rotate reader (portrait mode)

[micamur]

Describe your suggested feature

Hi, I would love to have the ability of rotating the reader sideways. It doesn't have to be the whole UI, even just the reader would be awesome.

I imagine the option in the reader menu, next to "Reading mode", "Scaling", etc.

My use case is reading on a Steam Deck, which I use only in lanscape mode except for reading manga. The big screen size is awesome. It would also benefit for transformable laptops with detachable keyboard.

I'm using v1.66.0

I've seen it mentionned in this issue but I'd like to bump it again (as the project is now archived): https://gitlab.com/valos/Komikku/-/issues/274

Here's what it looks like when forcing the system on portrait mode:

And in landscape mode:

(The difference feels huge, not sure the picture does justice)

Other details

No response

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