chore: bump version to v2026.4.270 and update dependencies}
- Bump project version from 2026.4.266 to 2026.4.270 in package.json - Update build version references from v2026.4.265 to v2026.4.268 across docs - Upgrade bootstrap and bootswatch from ^5.3.3 to ^5.3.8 - Upgrade sass from ^1.86.0 to ^1.98.0 - Upgrade marked from =17.0.4 to =17.0.5 - Upgrade codemirror from ^6.0.0 to ^6.0.2 - Add changelog entry for v2024.4.261 (Bootstrap 3->5, jQuery 3->4, CodeMirror 5->6) - Fix punctuation in commits-list.twig and index.twig templates (add commas) - Update yarn.lock to reflect dependency changes