I am having similar problem, I have

import { bootstrapApplication } from '@angular/platform-browser';
import { provideHttpClient, withInterceptorsFromDi } from '@angular/common/http';
import { provideAnimationsAsync } from '@angular/platform-browser/animations/async';
import { providePrimeNG } from 'primeng/config';
import Aura from '@primeng/themes/aura';
import { AppComponent } from './app/app.component';

bootstrapApplication(AppComponent, {
  providers: [
    provideAnimationsAsync(),
    providePrimeNG({
      theme: { preset: Aura }
    }),
    provideHttpClient(withInterceptorsFromDi())
  ]
});

But it doesn't seem to use the theme.