GoogleCastMiniController class

A floating mini controller widget for Google Cast media playback.

This widget provides a beautiful, floating mini controller that displays:

• Media artwork with rounded corners and shadows
• Media title and casting device information
• Play/pause controls with theme-aware styling
• A sleek progress indicator

The widget consumes and respects the ExpandedGoogleCastPlayerTheme for consistent styling.

Example usage:

GoogleCastMiniController(
  theme: ExpandedGoogleCastPlayerTheme(
    backgroundColor: Colors.white,
    titleTextStyle: TextStyle(
      fontSize: 16,
      fontWeight: FontWeight.w600,
      color: Colors.black,
    ),
    deviceTextStyle: TextStyle(
      fontSize: 12,
      color: Colors.grey[600],
    ),
    iconColor: Colors.blue,
    iconSize: 28,
    imageBorderRadius: BorderRadius.circular(12),
    imageShadow: [
      BoxShadow(
        color: Colors.black26,
        blurRadius: 8,
        offset: Offset(0, 2),
      ),
    ],
  ),
  margin: EdgeInsets.all(16),
  borderRadius: BorderRadius.circular(16),
  showDeviceName: true,
)