Conversion to mpv for playback mostly complete.

src/config_manager.py

@@ -56,6 +56,10 @@ class ConfigManager:
             'show_text': 'true'
         }
 
+        self.config['Audio'] = {
+            'playback_speed': '1.0'
+        }
+
         self.config['Paths'] = {
             'last_book': '',
             'books_directory': str(Path.home()),
@@ -306,3 +310,19 @@ class ConfigManager:
         serverUrl = self.get_abs_server_url()
         username = self.get_abs_username()
         return bool(serverUrl and username)
+
+    def get_playback_speed(self):
+        """Get audio playback speed (0.5 to 2.0)"""
+        try:
+            speed = float(self.get('Audio', 'playback_speed', '1.0'))
+            # Clamp to valid range
+            return max(0.5, min(2.0, speed))
+        except ValueError:
+            return 1.0
+
+    def set_playback_speed(self, speed):
+        """Set audio playback speed (0.5 to 2.0)"""
+        # Clamp to valid range
+        speed = max(0.5, min(2.0, float(speed)))
+        self.set('Audio', 'playback_speed', str(speed))
+        self.save()