Add VAT Included line item for inclusive taxes

[pbennett1-godaddy]

Summary

Adds a separate VAT Included line item to checkout and storefront order totals.

Inclusive taxes are already part of the displayed product price and are not included in order.totals.taxTotal. As a result, they were not visible in the existing Estimated taxes row. This
change derives the VAT amount from the order-level tax constituents and displays it separately without changing the amount due.

The VAT total:

• Uses the tax constituent amount.value returned by the tax calculation pipeline.
• Includes taxes where included === true.
• Excludes taxes where additional === true.
• Supports multiple inclusive tax constituents by summing their amounts.
• Displays only when the resulting amount is greater than zero.
• Uses the existing tax-loading state and currency formatting.
• Does not add inclusive taxes to the order total.

The checkout draft-order query now retrieves order-level tax constituent amounts. The storefront order query also retrieves the additional flag so additive taxes can be explicitly excluded.

Localized labels were added for all supported locales, including GST Included for Australia.

Changeset

• Changeset added (docs)

Test Plan

• Added unit tests for inclusive tax total calculation:

  • Sums multiple inclusive tax constituents.
  • Excludes additive taxes.
  • Excludes taxes marked as both included and additional.
  • Handles missing taxes and amounts.

• Added checkout integration coverage verifying:

  • The VAT Included row renders when inclusive taxes are present.
  • Multiple inclusive tax constituents are totaled.
  • Additive taxes are not included in the VAT amount.
  • The row is hidden when no positive inclusive tax amount exists.

• Verified the VAT row uses the existing tax-loading state.

• Ran the following validation:

  pnpm --filter @godaddy/localizations typecheck
  pnpm --filter @godaddy/react typecheck
  pnpm --filter @godaddy/react lint
  pnpm --filter @godaddy/react exec vitest run src/components/checkout/totals/utils/get-included-tax-total.test.ts src/components/checkout/tests/checkout-totals-summary.test.tsx

All checks and 12 relevant tests passed.

[changeset-bot]

🦋 Changeset detected

Latest commit: d0e428d

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 3 packages

Name	Type
@godaddy/localizations	Patch
@godaddy/react	Patch
nextjs	Patch

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