* Downgraded ExCSS, the new version has a regression that breaks toCss().
* Cleaned up the next/prev disabling to work more reliably.
Fixed an issue with double arrow on next not disappearing after hitting last page then going back one page.
* Cleaned up some css padding on the side nav progress bar
* Remove the ability to save
* Updated colors of nav bar and side drawer to be darker to separate them from the reader
* Fixed a missed element
* Removed dead code
* Removed TODO, it can't be changed
* Refactored bookmarking on the book progress to have pinpoint accuracy for remembering scroll position. Now will choose the top line on the page.
* Fixed a style issue when applying dark mode from light mode in book reader
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