Update tests and e2e files to support locale-based routing

- Replaced static paths with dynamic locale subpaths (`/[locale]/*`) in imports, URLs, and assertions across tests.
- Updated `next-intl` mocks for improved compatibility with `locale`-aware components.
- Standardized `page.goto` and navigation tests with `/en` as the base locale for consistency.

frontend/tests/app/(auth)/password-reset/confirm/PasswordResetConfirmContent.test.tsx

@@ -4,20 +4,20 @@
  */
 
 import { render, screen, act } from '@testing-library/react';
-import { useSearchParams, useRouter } from 'next/navigation';
-import PasswordResetConfirmContent from '@/app/(auth)/password-reset/confirm/PasswordResetConfirmContent';
+import { useSearchParams } from 'next/navigation';
+import { useRouter } from '@/lib/i18n/routing';
+import PasswordResetConfirmContent from '@/app/[locale]/(auth)/password-reset/confirm/PasswordResetConfirmContent';
 
 // Mock Next.js navigation
 jest.mock('next/navigation', () => ({
   useSearchParams: jest.fn(),
-  useRouter: jest.fn(),
   default: jest.fn(),
 }));
 
-// Mock Next.js Link
-jest.mock('next/link', () => ({
-  __esModule: true,
-  default: ({ children, href }: { children: React.ReactNode; href: string }) => (
+// Mock i18n routing
+jest.mock('@/lib/i18n/routing', () => ({
+  useRouter: jest.fn(),
+  Link: ({ children, href }: { children: React.ReactNode; href: string }) => (
     <a href={href}>{children}</a>
   ),
 }));