Mock POST /api/search/nl (delayed fixture: 2-name directional + applied
keyword), assert loading announcement → chips render → axe-clean in light
and dark → removing the keyword chip re-runs a keyword GET with the
remaining sender+receiver params. Adds a data-testid wrapper on the NL
results region for axe scoping.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
