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/i18n/en.ts

@@ -261,6 +261,14 @@ export const en: Translations = {
     filterColor: 'Color',
     filterSize: 'Size',
     filterAttributes: 'Attributes',
+    favorite: 'Add to favorites',
+    compare: 'Compare',
+    share: 'Share',
+    quickView: 'Quick view',
+    stockHigh: 'In stock',
+    stockMedium: 'Limited stock',
+    stockLow: 'Almost gone',
+    stockOut: 'Out of stock',
   },
   productDetails: {
     loading: 'Loading product...',