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/translations.ts

@@ -1097,6 +1097,7 @@ export interface Translations {
     compareEmptyTitle: string;
     compareEmptyDescription: string;
     clearCompare: string;
+    removeFromCompare: string;
     hideIdentical: string;
     highlightDifferences: string;
     clearRecentlyViewed: string;