fix(frontend): remove locale-dependent routing and migrate to centralized locale-aware router

- Replaced `next/navigation` with `@/lib/i18n/routing` across components, pages, and tests.
- Removed redundant `locale` props from `ProjectWizard` and related pages.
- Updated navigation to exclude explicit `locale` in paths.
- Refactored tests to use mocks from `next-intl/navigation`.

frontend/tests/components/projects/ProjectDashboard.test.tsx

@@ -92,18 +92,8 @@ jest.mock('@/lib/hooks/useProjectEvents', () => ({
   useProjectEvents: jest.fn(() => mockUseProjectEventsResult),
 }));
 
-// Mock next/navigation
-const mockPush = jest.fn();
-jest.mock('next/navigation', () => ({
-  useRouter: () => ({
-    push: mockPush,
-    back: jest.fn(),
-    forward: jest.fn(),
-    refresh: jest.fn(),
-    replace: jest.fn(),
-    prefetch: jest.fn(),
-  }),
-}));
+// Import mock from next-intl/navigation mock (used by @/lib/i18n/routing)
+import { mockPush } from 'next-intl/navigation';
 
 describe('ProjectDashboard', () => {
   const projectId = 'test-project-123';