component/active-listener-card: display user listening activity

[Rend1027]

• Follow wireframe layout for active listener display

Build ActiveListenerCard component that shows:

• Album cover image (not sure about this one)
• Song title
• Artist name
• Display name (later maybe location of listener)
• Preview button linking to Spotify
• Make responsive and reusable across:
  - Dashboard
  - “Active Listeners” section

The SongCard will be used in:

🎧 Real-time dashboard

📍 Map popups (maybe)

📈 Trending section

Helps users see who is actively listening and what they're playing — makes the app feel alive and social.