WIP: ✨ (expo): Support bookmarking and theme customizations

[aaronleopold]

This is a heavy WIP, we'll see if I can clean it up enough to get it in before the new year

[codecov]

Codecov Report

❌ Patch coverage is 0% with 15 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
crates/graphql/src/mutation/epub.rs	0.00%	15 Missing ⚠️

Files with missing lines	Coverage Δ
crates/graphql/src/mutation/epub.rs	0.00% <0.00%> (ø)

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