yazi 26.x renamed the previewer/fetcher match key from name to url. The
fetchers were updated but the markdown previewer still used name, so the
whole [plugin] config failed to parse ("at least one of 'url' or 'mime'
must be specified") and yazi fell back to its presets.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>