fix(frontend): remove unused test import blocking docker build

Drop unused fireEvent import in EntityDetailPage test to satisfy TypeScript noUnusedLocals during frontend build inside docker compose.

frontend/src/__tests__/pages/EntityDetailPage.test.tsx

@@ -1,4 +1,4 @@
-import { render, screen, waitFor, fireEvent } from '@testing-library/react'
+import { render, screen, waitFor } from '@testing-library/react'
 import { describe, it, expect, vi } from 'vitest'
 import { MemoryRouter, Route, Routes } from 'react-router-dom'
 import { QueryClient, QueryClientProvider } from '@tanstack/react-query'