- Convert PDF highlights from filled rectangles to underlines matching EPUB style
- Update PDF annotation editor with EPUB-style design: gold sidebar rail, semi-transparent background, improved spacing and shadows, dark mode support
- Change PDF page-curl paging from left-right horizontal to up-down vertical: update gesture recognition and tap regions accordingly
Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
