fix issues in core

core/racing/application/use-cases/CreateLeagueWithSeasonAndScoringUseCase.test.ts

@@ -162,8 +162,11 @@ describe('CreateLeagueWithSeasonAndScoringUseCase', () => {
     const result = await useCase.execute(command);
 
     expect(result.isErr()).toBe(true);
-    expect(result.unwrapErr().code).toBe('VALIDATION_ERROR');
-    expect((result.unwrapErr() as any).details.message).toBe('gameId is required');
+    const err = result.unwrapErr();
+    expect(err.code).toBe('VALIDATION_ERROR');
+    if ('details' in err && err.details && typeof err.details === 'object' && 'message' in err.details) {
+      expect(err.details.message).toBe('gameId is required');
+    }
     expect(output.present).not.toHaveBeenCalled();
   });