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/src/app/[locale]/(authenticated)/projects/[id]/issues/page.tsx

@@ -10,7 +10,7 @@
  */
 
 import { useState, use } from 'react';
-import { useRouter } from 'next/navigation';
+import { useRouter } from '@/lib/i18n/routing';
 import { Plus, Upload } from 'lucide-react';
 import { Button } from '@/components/ui/button';
 import { Skeleton } from '@/components/ui/skeleton';
@@ -25,7 +25,7 @@ interface ProjectIssuesPageProps {
 }
 
 export default function ProjectIssuesPage({ params }: ProjectIssuesPageProps) {
-  const { locale, id: projectId } = use(params);
+  const { id: projectId } = use(params);
   const router = useRouter();
 
   // Filter state
@@ -49,7 +49,7 @@ export default function ProjectIssuesPage({ params }: ProjectIssuesPageProps) {
   const { data, isLoading, error } = useIssues(projectId, filters, sort);
 
   const handleIssueClick = (issueId: string) => {
-    router.push(`/${locale}/projects/${projectId}/issues/${issueId}`);
+    router.push(`/projects/${projectId}/issues/${issueId}`);
   };
 
   const handleBulkChangeStatus = () => {