Function apply_settings 

pub fn apply_settings(
    unique_id: &str,
    autos: &[(AutoToggle, bool)],
    values: &[(CameraControl, i32)],
) -> Result<(), ControlError>

Apply auto toggles and control values in one device open.

Autos are written first: a manual value is rejected while its auto mode still owns the control, so dragging an auto-gated slider must clear the mode before the value lands. Controls are then batched per class, since VIDIOC_S_EXT_CTRLS refuses a mixed-class call.

Unsupported controls are skipped rather than failing the batch — a profile saved against a Brio shouldn’t fail wholesale when applied to a C270.

Errors

ControlError::NotFound when no node matches unique_id; the first I/O error otherwise.