fix(admin): polish orders

Same gap as products/categories: table select-all and per-row select
checkboxes had no accessible name. Added aria-label (row label
includes order number for context). New adminOrders.selectAllRows/
selectRow keys across en/ru/hy.

Order detail page and order-timeline component reviewed — no
interactive checkboxes or focus-visible gaps found there.

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

src/app/i18n/translations.ts

@@ -1291,6 +1291,8 @@ export interface Translations {
     back: string;
     search: string;
     export: string;
+    selectAllRows: string;
+    selectRow: string;
     view: string;
     orderNumber: string;
     customer: string;