What's Changed

• View transition support in page-router.js
• Active navigation links are set with active property. Styleable via [active] { ... }
• All CSS processed with Lightning CSS, which is now a hard dependency
• Disable Lightning CSS via config: lightning_css: false
• Nue islands are now embedded with Web Component compatible is attribute
• include: [ foo ] and exclude: [ bar ] settings to include/exclude CSS files from app/page
• Removed prefetch_global setting