✨ Add image reader experience options

[aaronleopold]

Resolves #384
Resolves #391
Resolves #437

This PR implements a few image-based reader features:

1. View two images at once (double spread)
2. Specify the scaling mode for the images (height, width, none)
3. Support right-to-left reading
4. Horizontal scroll reading mode (not an ideal UX yet, IMO)

You will be able to configure defaults for the reading experience on a per-library basis, and override any individual setting per-book.

⚠️ I've only implemented the first and third features for the paged reader. This change-set is rather large, so I'd rather tackle adding them to the horizontal scroll reader at another time

I've sneaked in a few other changes, as well:

• Tweaked the contrast for some of the new themes
• Add optional gradient support for themes
• Refactored all of the tailwind configuration to use TypeScript
• A few others I can't remember

There are some cleanup tasks remaining, and I'd like to add the corresponding library configuration I mentioned above in the settings pages, and then this should be ready to go. I'm aiming for sometime next week

[codecov]

Codecov Report

Attention: Patch coverage is 6.09756% with 77 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
core/src/db/entity/common.rs	0.00%	40 Missing ⚠️
apps/server/src/routers/api/v1/library.rs	0.00%	18 Missing ⚠️
core/src/db/entity/library/config.rs	0.00%	12 Missing ⚠️
core/src/lib.rs	0.00%	5 Missing ⚠️
apps/server/src/routers/api/v1/media.rs	0.00%	1 Missing ⚠️
apps/server/src/routers/api/v1/user.rs	0.00%	1 Missing ⚠️

Files with missing lines	Coverage Δ
apps/server/src/utils/test_utils.rs	100.00% <100.00%> (ø)
core/src/db/entity/user/preferences.rs	80.64% <100.00%> (+0.25%)	⬆️
core/src/db/filter/smart_filter.rs	60.46% <100.00%> (+0.07%)	⬆️
core/src/opds/v2_0/publication.rs	98.47% <100.00%> (+<0.01%)	⬆️
apps/server/src/routers/api/v1/media.rs	0.00% <0.00%> (ø)
apps/server/src/routers/api/v1/user.rs	0.00% <0.00%> (ø)
core/src/lib.rs	0.00% <0.00%> (ø)
core/src/db/entity/library/config.rs	0.00% <0.00%> (ø)
apps/server/src/routers/api/v1/library.rs	0.00% <0.00%> (ø)
core/src/db/entity/common.rs	8.23% <0.00%> (-7.33%)	⬇️

[aaronleopold]

Alright, I think this is almost ready to go. There are a few things I want to highlight as things I'll have to either improve or fix as follow-ups:

1. The reader isn't aware when the viewport is too small for double spread. I definitely will add this kind of detection logic, but the work around for the time being is... don't do that lol
2. When double spread is active, highlight both pages in the image previews (bottom bar)
3. Add the ability to artificially constrain the reader width (see [BUG] Image scaling makes long strip comics unreadable #437 (comment))

There is one other issue that I'd like to tackle before merge where the bottom bar preview is too "strict" and will scroll you back as you try to navigate ahead. Otherwise, I'm anxious to get this out for further testing. My tentative plan moving forward is:

• Wrap up the sdk rewrite
• Probably release after this change-set sits for a week in nightly
• Either flesh out smart list UI (e.g. actually support creating a list outside the API) OR start bulk management features
• Go back to reader enhancement follow-ups
• I'm itching to take a "break" and work on the mobile app, but we'l see. There is a lot of other important bits to tackle

[aaronleopold]

There is one other issue that I'd like to tackle before merge where the bottom bar preview is too "strict" and will scroll you back as you try to navigate ahead

I've fixed this for the most part, so I am going to merge this in shortly. I don't think the UX is perfect TBH, but am eager to get it out there and tested