chore: bump version to v2026.4.318 and fix navbar dropdown scroll}
- Bump version from v2026.4.317 to v2026.4.318 across docs and package.json - Bump package.json internal version from 2026.4.318 to 2026.4.319 - Update CSS cache-busting hash in themes.js and package.json corifeus config - Apply color-scheme (dark/light) to both body and html element via :has() selector - Disable dropdown's own scroll inside navbar theme/language lists, deferring to navbar container scroll - Add changelog entry for v2026.4.318