http://localhost:3000 is a development server started by Vite to serve your assets like CSS and JavaScript, and is started when running npm run dev.
The APP_URL displayed is the URL set in your .env file, the default APP_URL is auto-generated to match the folder name and ends with .test for Laravel Valet since that is the TLD Valet uses. It won't be accessible if you're serving via artisan serve and if you're using artisan serve for your development I'd recommend changing the APP_URL to match http://localhost:8000 instead.
