fix(storefront): polish compare

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>

src/app/i18n/en.ts

@@ -1098,6 +1098,7 @@ export const en: Translations = {
     compareEmptyTitle: 'No products to compare',
     compareEmptyDescription: 'Add products from catalog cards to compare specs and prices.',
     clearCompare: 'Clear compare',
+    removeFromCompare: 'Remove from compare',
     hideIdentical: 'Hide identical values',
     highlightDifferences: 'Highlight differences',
     clearRecentlyViewed: 'Clear recently viewed',