46c2109f1f
## Summary Closes #766. Thank you for the help @bramschulting! **What is the goal of this PR?** - First and foremost, fix issue #766. - Through working on that, I realized the current CSS parsing/loading code can be improved dramatically for large files and still had additional performance improvements to be made, even with EPUBs with small CSS. **What changes are included?** - Stream CSS parsing and reuse normalization buffers to cut allocations - Add rule limits and selector validation to release rules and free up memory when needed - Skip CSS parsing/loading entirely when "Book's Embedded Style" is off ## Additional Context - My test EPUB has been updated [here](https://github.com/jdk2pq/css-test-epub) to include a very large CSS file to test this out --- ### AI Usage While CrossPoint doesn't have restrictions on AI tools in contributing, please be transparent about their usage as it helps set the right context for reviewers. Did you use AI tools to help write this code? _**YES**_, Codex
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