The automated unused-var cleanup incorrectly removed const mx = useMatrixClient()
from MessageDeleteItem and ReportMessage components in Message.tsx. Both components
use mx inside their useCallback closures (mx.redactEvent, mx.reportEvent). This
caused a ReferenceError crash on the messages view in production.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>