fix issue with database path falling back to faulty path

update logic in welcome wizard, add checks for qapplication instance

src/ui/userInterface.py

@@ -66,7 +66,7 @@ log.add(
     rotation="1 day",
     retention="1 month",
 )
-
+log.critical("UI started")
 valid_input = (0, 0, 0, 0, 0, 0)
 
 
@@ -1812,7 +1812,11 @@ def launch_gui():
     # #log.debug("checking if database available")
 
     log.info("Starting login dialog")
-    app = QtWidgets.QApplication(sys.argv)
+    app = QtWidgets.QApplication.instance()
+    if app is None:
+        app = QtWidgets.QApplication(sys.argv)
+    else:
+        log.info("Using existing QApplication instance")
     login_dialog = QtWidgets.QDialog()
     ui = LoginDialog()
     ui.setupUi(login_dialog)