Adjust ConfirmationDialog heading styling

[langermank]

Closes https://github.com/github/primer/issues/4257

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Merge checklist

• Added/updated tests
• Added/updated documentation
• Added/updated previews (Storybook)
• Changes are SSR compatible
• Tested in Chrome
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• (GitHub staff only) Integration tests pass at github/github (Learn more about how to run integration tests)

[changeset-bot]

🦋 Changeset detected

Latest commit: 68cf909

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

This PR includes changesets to release 2 packages

Name	Type
@primer/react	Patch
@primer/styled-react	Patch

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[Copilot]

Pull Request Overview

This PR updates the ConfirmationDialog component's heading styling by replacing the custom-styled <h1> element with the design system's Heading component to ensure consistent typography across the application.

Key changes:

• Import and use the Heading component instead of plain <h1>
• Remove custom CSS styles for the heading element
• Apply "small" variant to the Heading component for consistent sizing

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
packages/react/src/ConfirmationDialog/ConfirmationDialog.tsx	Replaces custom <h1> with Heading component using "small" variant
packages/react/src/ConfirmationDialog/ConfirmationDialog.module.css	Removes custom font-size, font-weight, and margin styles for h1 element

[Copilot]

The CSS selector > h1 may not match the new Heading component structure. Consider updating the selector to target the actual rendered element or use a more generic approach to ensure the padding and flex-grow styles are properly applied.

Suggested change

	> h1 {
	> * {

[github-actions]

👋 Hi, this pull request contains changes to the source code that github/github depends on. If you are GitHub staff, we recommend testing these changes with github/github using the integration workflow. Thanks!