[Primitive] Slider

[jbatte47]

Summary

Introduce a Slider primitive for numeric range selection.

Intended role in Lattice

Slider provides an accessible control for selecting a numeric value without product logic.

Proposed API

• value / onValueChange (controlled)
• min / max / step
• size: sm | md | lg
• state: default | invalid | disabled | loading

Variants

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

Non-goals

• Does not implement range sliders (multi-thumb) unless specified.
• Does not accept arbitrary colors.

States

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

Accessibility checklist

• Implements slider ARIA pattern.
• Keyboard controls for increment/decrement.
• Proper aria-valuemin, aria-valuemax, aria-valuenow.