Pull request

Description

This PR integrates the shuffle and repeat modes inside the demo player toolbar.

Changes made

• Update the demo player toolbar to optionally display shuffle and repeat buttons.
• Remove the shuffle button from the playlist view.
• Update the playlist view to display the "Add" and "Remove all" buttons as FABs.
• Remove the repeat mode toggle from CustomPlaybackSettingsShowcase.
• Add a new Player.repeatModeAsFlow().
• Add a new Player.Commands.canSetShuffleMode().
• Add a new Player.Commands.canSetRepeatMode().
• Add a new Player.repeatModeAsState().

Screenshots

Description	Dark mode	Light mode
Playlist view
CustomPlaybackSettingsShowcase

Checklist

• APIs have been properly documented (if relevant).
• The documentation has been updated (if relevant).
• New unit tests have been written (if relevant).
• The demo has been updated (if relevant).