refactor: address loading review findings (#18)

frontend/src/app/components/apartment-form/apartment-form.spec.ts

@@ -58,6 +58,7 @@ describe('ApartmentForm', () => {
     fixture.detectChanges();
 
     expect(fixture.nativeElement.querySelector('fieldset').disabled).toBe(true);
+    expect(fixture.nativeElement.querySelector('[role=status]').closest('fieldset')).toBeNull();
     expect(fixture.nativeElement.textContent).toContain('Enregistrement…');
     expect(fixture.nativeElement.textContent).toContain(
       'Impossible d’enregistrer cet appartement.',