The clickable-button variant of relationRow was missing the truncate
class that the read-only span fallback already had — long slugs (task
UUIDs, exec IDs) rendered at their full pre-truncated length inside a
shrink-only flex item, overflowing the narrow detail sidebar and
wrapping to extra lines. Give both sides flex-1 + truncate so they
share the row's width evenly and always stay on one line.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>