[UI/UX] BEATS Tab - Music Player Improvements

[ucguy4u]

Part of #187 - UI/UX Architecture Improvements

Tab Purpose

Music discovery and playback

Required Changes

• AppBar: Title 'Beats' with Search and Queue action icons
• Now Playing section (prominent, always visible when playing)
• Browse sections: Playlists, Artists, Recently Played
• Mini player available within this tab
• Streaming quality indicator

UX Rules

• Music mini player shows here
• No greetings
• No quotes

Files to Modify

• app/lib/features/music/presentation/screens/music_screen.dart
• app/lib/features/music/presentation/widgets/mini_player.dart