feat(samples): review and update headless-commerce-react (KIT-5680)

[alexprudhomme]

KIT-5680

Problem

The existing headless-commerce-react sample needs review and updates to ensure it meets scaffolding template standards.

Solution

Review the existing sample, ensure it uses searchuisamples credentials, has proper minimal configuration, and is ready to serve as a scaffolding template.

[svcsnykcoveo]

✅ Snyk checks have passed. No issues have been found so far.

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[changeset-bot]

⚠️ No Changeset found

Latest commit: a3dc02e

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[pkg-pr-new]

• coveo-atomic-pkg-new-template

@coveo/atomic

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@coveo/atomic-hosted-page

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@coveo/atomic-react

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@coveo/auth

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@coveo/bueno

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@coveo/create-atomic

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@coveo/create-atomic-component

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@coveo/create-atomic-component-project

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@coveo/create-atomic-result-component

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@coveo/create-atomic-rollup-plugin

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@coveo/headless

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@coveo/headless-react

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@coveo/shopify

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commit: a3dc02e