refactor: initialize QTimer with parent and ensure proper thread cleanup on stop

core/camera/camera_controller.py

@@ -23,7 +23,7 @@ class CameraWorker(QObject):
     @Slot()
     def initialize_worker(self):
         """Initializes the timer in the worker's thread."""
-        self.timer = QTimer()
+        self.timer = QTimer(self)
         self.timer.timeout.connect(self._update_frame)
 
     @Slot(BaseCamera, int)
@@ -138,12 +138,15 @@ class CameraController(QObject):
 
         # Initialize worker when thread starts
         self._thread.started.connect(self._worker.initialize_worker)
+        self._thread.finished.connect(self._worker.stop_camera)
 
         self._thread.start()
 
     def stop(self):
-        self._thread.quit()
-        self._thread.wait()
+        if self._thread.isRunning():
+            self._thread.quit()
+            self._thread.wait()
+            self._thread.deleteLater()
 
     def set_camera(self, camera: BaseCamera, fps: int = 15) -> None:
         self._set_camera_requested.emit(camera, fps)