feat: [combobox] add createItems for id-based values

[ravisuhag]

Summary

• Add Combobox.createItems from Base UI 1.8. It wraps a data array with getValue and getLabel, so value and onValueChange use IDs while the list renders full items.
• Add an Item type parameter to the root prop types. It defaults to Value, so existing code type-checks as before.
• Combobox.Content accepts a function child that renders each item matching the input when items is set.
• Multi-select chips show the item label from getLabel, not the raw value. Before, a chip showed the ID.
• Add a "Using IDs as values" docs section and tests.

Stacked on #945. Merge that first.

• I have followed the pull request section of the contributing guide.

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Project	Deployment	Actions	Updated
apsara	Ready	Preview	Oct 8, 2026 1:20am UTC

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📥 Commits

Reviewing files that changed from the base of the PR and between d715734 and 086e18a.

📒 Files selected for processing (9)

• apps/www/src/content/docs/components/combobox/demo.ts
• apps/www/src/content/docs/components/combobox/index.mdx
• apps/www/src/content/docs/components/combobox/props.ts
• packages/react/components/combobox/__tests__/combobox.test.tsx
• packages/react/components/combobox/combobox-content.tsx
• packages/react/components/combobox/combobox-input.tsx
• packages/react/components/combobox/combobox-items.ts
• packages/react/components/combobox/combobox-root.tsx
• packages/react/components/combobox/combobox.tsx

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commit: 086e18a