fix(frontend): resolve lint blockers for gitea frontend-ci

frontend/src/app/(protected)/tasks/[id]/page.tsx

@@ -2,7 +2,6 @@
 
 import { use } from 'react';
 import Link from 'next/link';
-import { useRouter } from 'next/navigation';
 import { useTask, useUpdateTask } from '@/hooks/useTasks';
 import { Button } from '@/components/ui/button';
 import { Badge } from '@/components/ui/badge';
@@ -25,7 +24,6 @@ const statusColors: Record<string, string> = {
 
 export default function TaskDetailPage({ params }: { params: Promise<{ id: string }> }) {
   const resolvedParams = use(params);
-  const router = useRouter();
   const { data: task, isLoading, error } = useTask(resolvedParams.id);
   const { mutate: updateTask, isPending } = useUpdateTask();