Update Storybook dependencies

[joshblack]

Closes N/A

Changelog

New

N/A

Changed

• Updated Storybook-related dev dependencies to their latest published versions.
• Regenerated package-lock.json for the updated dependency graph.

Removed

N/A

Rollout strategy

• Patch release
• Minor release
• Major release; if selected, include a written rollout or migration plan
• None; dev dependency update only, with no published package API or runtime behavior change.

Testing & Reviewing

• npm run build:storybook
• npm run build
• npm test -- --run hit two transient Chromium click timeouts; rerunning the affected test files passed.
• npm run type-check
• npm run lint
• npm run lint:css
• npm run format:diff

Merge checklist

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

[changeset-bot]

⚠️ No Changeset found

Latest commit: 9140c9c

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[Copilot]

Pull request overview

This pull request updates Storybook-related development dependencies across the monorepo (root, @primer/react, and @primer/styled-react) and regenerates package-lock.json to reflect the new dependency graph.

Changes:

• Bumped Storybook core (storybook) and Storybook React/Vite + addons to ^10.4.2.
• Updated Storybook-related tooling dependencies (notably @storybook/addon-mcp and @storybook/icons).
• Regenerated package-lock.json after dependency updates.

Show a summary per file

File	Description
packages/styled-react/package.json	Updates @storybook/react-vite dev dependency version.
packages/react/package.json	Updates Storybook-related dev dependencies and storybook version used by the React package’s Storybook setup.
package.json	Updates root Storybook tooling deps (including storybook and eslint-plugin-storybook).
package-lock.json	Regenerated lockfile reflecting updated Storybook/tooling dependency graph.

Copilot's findings

• Files reviewed: 3/4 changed files
• Comments generated: 1