chore: add pay component to lab back

[enesozturk]

Description

Please include a brief summary of the change.

Type of change

• Chore (non-breaking change that addresses non-functional tasks, maintenance, or code quality improvements)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Associated Issues

For Linear issues: Closes APKT-xxx
For GH issues: closes #...

Showcase (Optional)

If there is a UI change include the screenshots with before and after state.
If new feature is being introduced, include the link to demo recording.

Checklist

• Code in this PR is covered by automated tests (Unit tests, E2E tests)
• My changes generate no new warnings
• I have reviewed my own code
• I have filled out all required sections
• I have tested my changes on the preview link
• Approver of this PR confirms that the changes are tested on the preview link

[changeset-bot]

⚠️ No Changeset found

Latest commit: 11825ac

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[vercel]

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Project	Deployment	Preview	Comments	Updated (UTC)
appkit-basic-html	Ready	Preview	Comment	Sep 1, 2025 11:45am
appkit-demo	Ready	Preview	Comment	Sep 1, 2025 11:45am
appkit-gallery	Ready	Preview	Comment	Sep 1, 2025 11:45am
appkit-laboratory	Canceled		Comment	Sep 1, 2025 11:45am

10 Skipped Deployments

Project	Deployment	Preview	Comments	Updated (UTC)
appkit-basic-example	Ignored			Sep 1, 2025 11:45am
appkit-basic-sign-client-example	Ignored			Sep 1, 2025 11:45am
appkit-basic-up-example	Ignored			Sep 1, 2025 11:45am
appkit-ethers5-bera	Ignored			Sep 1, 2025 11:45am
appkit-nansen-demo	Ignored			Sep 1, 2025 11:45am
appkit-vue-solana	Ignored			Sep 1, 2025 11:45am
appkit-wagmi-cdn-example	Ignored			Sep 1, 2025 11:45am
ethereum-provider-wagmi-example	Ignored			Sep 1, 2025 11:45am
next-wagmi-solana-bitcoin-example	Ignored			Sep 1, 2025 11:45am
vue-wagmi-example	Ignored			Sep 1, 2025 11:45am

[Copilot]

Pull Request Overview

This PR adds the pay component back to the laboratory application by importing and rendering the AppKitPay component in DemoContent.

• Import AppKitPay component in DemoContent.tsx
• Render AppKitPay component in the main demo content area

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[github-actions]

Coverage Report

Status	Category	Percentage	Covered / Total
🔵	Lines	78.32%	34816 / 44448
🔵	Statements	78.32%	34816 / 44448
🔵	Functions	76.22%	3837 / 5034
🔵	Branches	86.71%	8222 / 9482

File Coverage

No changed files found.

Generated in workflow #14664 for commit 11825ac by the Vitest Coverage Report Action