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.ts

@@ -6,6 +6,13 @@ import { LangRoutePipe } from '../../pipes/lang-route.pipe';
 import { TranslatePipe } from '../../i18n/translate.pipe';
 import { getBadgeClass, getDiscountedPrice, getMainImage } from '../../utils/item.utils';
 
+const STOCK_LABEL_KEYS: Record<string, string> = {
+  high: 'catalog.stockHigh',
+  medium: 'catalog.stockMedium',
+  low: 'catalog.stockLow',
+  out: 'catalog.stockOut'
+};
+
 export type ProductCardAppearance = 'standard' | 'compact';
 
 @Component({
@@ -83,6 +90,10 @@ export class ProductCardComponent {
     this.shareRequested.emit(this.item.itemID);
   }
 
+  stockLabelKey(remainings: string): string {
+    return STOCK_LABEL_KEYS[remainings.toLowerCase()] ?? STOCK_LABEL_KEYS['high'];
+  }
+
   showFavoriteControl(): boolean {
     return this.showFavoriteAction || this.showFavoritePlaceholder;
   }