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

frontend/src/hooks/__tests__/useActiveClub.test.ts

@@ -1,7 +1,6 @@
-import { describe, it, expect, beforeEach, vi, afterEach } from 'vitest';
+import { describe, it, expect, beforeEach, vi } from 'vitest';
 import { renderHook, act } from '@testing-library/react';
 import { useActiveClub } from '../useActiveClub';
-import type { Session } from 'next-auth';
 
 const mockUseSession = vi.fn();
 
@@ -33,15 +32,15 @@ describe('useActiveClub', () => {
       status: 'authenticated',
     });
     
-    (localStorage.getItem as any).mockImplementation((key: string) => {
+    (localStorage.getItem as ReturnType<typeof vi.fn>).mockImplementation((key: string) => {
       return localStorageData[key] || null;
     });
     
-    (localStorage.setItem as any).mockImplementation((key: string, value: string) => {
+    (localStorage.setItem as ReturnType<typeof vi.fn>).mockImplementation((key: string, value: string) => {
       localStorageData[key] = value;
     });
     
-    (localStorage.clear as any).mockImplementation(() => {
+    (localStorage.clear as ReturnType<typeof vi.fn>).mockImplementation(() => {
       localStorageData = {};
     });
   });