Switch

A setting that takes effect the moment it is flipped. Not a checkbox: that one waits for the form to be saved.

When to use it

The choice is saved immediately — a toggle in account settings, switching a module on, showing a column.
The state is binary and reads as on/off, not as selected.
Several such choices stand under each other and should look the same.

The choice takes effect when the form is saved. That is IngotCheckbox — a switch would promise an immediate effect that did not happen.
One option out of several is being chosen. That is IngotRadioGroup or IngotSegmented.
The change is irreversible or expensive. A switch does not carry that; a button with a confirmation does.

checked: boolean — The state. Controlled — the caller owns the value.
onChange: (next: boolean) => void — Called right after the flip. Saving is the caller's job and should be immediate.
label: ReactNode — Translated visible label. It carries the control's name, hence required.
hint: ReactNode — A sentence under the label — what happens when it is on. Bound with aria-describedby.
disabled: boolean — An unavailable choice, typically because of a plan or permissions.
className: string — The row's layout only.
testId: string — An anchor for tests; the hint gets `${testId}-hint`.