Add accessible label to the compare-chip remove button: it rendered
only a bare × glyph with no aria-label, announced as meaningless
symbol text by screen readers. Added ux.removeFromCompare across all
three locales.
Global :focus-visible already covers .btn/.btn-primary/.btn-ghost, so
no separate focus styling was needed here.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>