Replace close button with a simple 'x' text for improved clarity and simplicity

b0esche_cloud/lib/widgets/audio_player_bar.dart

@@ -294,16 +294,19 @@ class _AudioPlayerBarState extends State<AudioPlayerBar>
               fontWeight: FontWeight.w500,
             ),
           ),
-          // Close button (smaller)
+          // Close button (simple small x)
           if (widget.onClose != null)
             Padding(
               padding: const EdgeInsets.only(left: 8.0),
-              child: ModernGlassButton(
-                onPressed: widget.onClose!,
-                child: const Icon(
-                  Icons.close,
-                  color: AppTheme.primaryText,
-                  size: 18,
+              child: GestureDetector(
+                onTap: widget.onClose!,
+                child: const Text(
+                  '×',
+                  style: TextStyle(
+                    color: AppTheme.primaryText,
+                    fontSize: 20,
+                    fontWeight: FontWeight.bold,
+                  ),
                 ),
               ),
             ),