Agent query: How is the music player app working? Can you browse through the library, artists, and playlists sections? Is the audio player interface visible at the bottom of the screen?

Add basic music player web app with library browsing functionality for songs, playlists, and artists.

Screenshot: https://storage.googleapis.com/screenshot-production-us-central1/576c3241-436b-4a7f-9839-25f219a22757/dcd372f4-97a1-46b8-a2ff-ec9551b52f98.jpg
