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

gotify_tray/__main__.py

@@ -8,12 +8,13 @@ def main():
         print(__version__)
     else:
         # Check for display before importing GUI modules
-        if not os.environ.get("DISPLAY"):
+        if not (os.environ.get("DISPLAY") or os.environ.get("WAYLAND_DISPLAY")):
             print(
                 "Error: No display environment detected. This application requires a graphical desktop environment to run.",
                 file=sys.stderr,
             )
             sys.exit(1)
+        print("Launching GUI")
         from gotify_tray.gui import start_gui
 
         start_gui()