Zec Mobility

- Improved Bluetooth communication and device status updates for more reliable data reading and command delivery. - Improved recovery when the controller temporarily stops responding, reducing repeated connection attempts and alerts. - Added clearer warnings for unresponsive controllers, communication errors, and potentially outdated device data. - Improved speed control in diagnostic mode, including stop-command handling when releasing the slider, leaving the screen, or moving the app to the background. - Added a warning and retry option when a stop command is not confirmed. - Refined related messages in English, Chinese, and Korean.