0.28.7

• [html] Fix missing check for showing inlines as tabs. #390
• [css] Improve m2m selector style.
• [css] Fix m2m selector not styled correctly. #393
• [css] Update related-widget links margins.
• [css] Use position: fixed; for related modal.
• [css] Improve html list preview rendering with django-streamfield.
• [js] Code refactoring for adding modal params to url and use const and let instead of var.
• [ci] Bump pre-commit hooks.