[Primitive] Combobox

[jbatte47]

Summary

Introduce a Combobox primitive for searchable option selection.

Intended role in Lattice

Combobox provides an accessible, composable control for filtering and selecting options without product logic.

Proposed API

• value / onValueChange (controlled)
• items: array of options
• size: sm | md | lg
• variant: outline | subtle
• state: default | invalid | disabled | loading

Variants

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

Non-goals

• Does not provide async data fetching.
• Does not implement multi-select.
• Does not accept arbitrary colors.

States

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

Accessibility checklist

• Implements combobox ARIA pattern.
• Keyboard navigation for listbox options.
• Proper aria-expanded, aria-controls, and aria-activedescendant management.