fix(catalog): translate product-card stock badge and action-button labels

P0-1: stock badge rendered the raw item.remainings value ('High',
etc) untranslated on every product card sitewide. Now maps to
catalog.stockHigh/Medium/Low/Out via the translate pipe; the 'out'
class check is now case-insensitive to match.

P0-2: favorite/share/quick-view action-button aria-labels rendered
literal 'catalog.favorite'/'catalog.share'/'catalog.quickView' keys
because they never existed in translations.ts/en.ts/ru.ts/hy.ts
(only catalog.compare existed, and it was likewise unused). Added
all 4 keys to the Translations interface and all 3 locales.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/app/components/product-card/product-card.component.html

@@ -6,7 +6,7 @@
         <div class="discount-badge" [attr.aria-label]="'Discount ' + item.discount + '%'">-{{ item.discount }}%</div>
       }
       @if (showStock && item.remainings) {
-        <span class="stock-badge" [class.out]="item.remainings === 'out'">{{ item.remainings }}</span>
+        <span class="stock-badge" [class.out]="item.remainings.toLowerCase() === 'out'">{{ stockLabelKey(item.remainings) | translate }}</span>
       }
 
       @if (showFavoriteControl() || showCompareControl() || showShareAction || showQuickViewPlaceholder) {