fix(admin): polish products

Add accessible names to the table-view select-all and per-row
checkboxes — they had none, while the grid-view equivalent already
did (product name via aria-label). New adminProducts.selectAllRows/
selectRow keys added across en/ru/hy.

Reviewed toolbar, filters, bulk actions, empty/loading states, and
grid view: all buttons already route through app-button (own
:focus-visible), empty state already uses shared EmptyStateComponent.
No orphaned bindings or corrupted glyphs found.

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

src/app/i18n/translations.ts

@@ -1539,6 +1539,8 @@ export interface Translations {
     emptyTitle: string;
     emptyDescription: string;
     emptyGuide: string;
+    selectAllRows: string;
+    selectRow: string;
     search: string;
     category: string;
     allCategories: string;