Function screenshot 

pub async fn screenshot(
    host: &Host,
    device_id: &str,
    output: &Path,
) -> Result<()>

Capture a screenshot from an Android device.

Uses adb exec-out screencap -p to capture the screen and writes the PNG data directly to the output file.

Errors

Returns an error if the screenshot command fails, the device is not available, or the output file cannot be written.