[Primitive] Switch

[jbatte47]

Summary

Introduce a Switch primitive for binary on/off state.

Intended role in Lattice

Switch provides a token-driven, accessible toggle control without domain logic.

Proposed API

• checked / onCheckedChange (controlled)
• size: sm | md | lg
• state: default | invalid | disabled | loading

Variants

• size: sm | md | lg
• state: default | invalid | disabled | loading

Non-goals

• Does not implement descriptive labels (compose externally).
• Does not accept arbitrary colors.

States

• default | hover | focus-visible | checked | invalid | disabled | loading.

Accessibility checklist

• Implements switch ARIA pattern or native checkbox semantics.
• Keyboard toggle behavior required.
• Focus-visible styles required.