Fix tray visibility and message reception issues

- Disable sound initialization to prevent hanging
- Add missing import re in utils.py
- Fix settings loading for QSettings
- Update file paths to use PROJECT_ROOT
- Revert to working API paths and listener from commit efdc63e

test_tray.py

@@ -0,0 +1,13 @@
+#!/usr/bin/env python3
+
+import sys
+from PyQt6 import QtWidgets
+
+app = QtWidgets.QApplication(sys.argv)
+
+if QtWidgets.QSystemTrayIcon.isSystemTrayAvailable():
+    print("System tray is available")
+else:
+    print("System tray is NOT available")
+
+sys.exit(0)