BranchName: Update storybook

[lukasoppermann]

Closes https://github.com/github/primer/issues/5270

Changelog

Updated storybook story to make sure we can test all instances of BranchName

New

Changed

Removed

Rollout strategy

• Patch release
• Minor release
• Major release; if selected, include a written rollout or migration plan
• None; if selected, include a brief description as to why

Testing & Reviewing

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 (Learn more about how to run integration tests)

[changeset-bot]

⚠️ No Changeset found

Latest commit: 93a040c

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.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR

[github-actions]

👋 Hi, this pull request contains changes to the source code that github/github-ui depends on. If you are GitHub staff, test these changes with github/github-ui using the integration workflow. Or, apply the integration-tests: skipped manually label to skip these checks.

[Copilot]

Pull Request Overview

This PR introduces stricter TypeScript typing for the BranchName component to ensure type safety around the href attribute. The component now enforces that href is required when rendering as an anchor tag (either explicitly with as="a" or by default), and disallows href when rendering as other elements.

Key changes:

• Added conditional type constraint requiring href: string when As extends 'a' and href?: never otherwise
• Updated default generic parameter to 'a' for better type inference
• Added test coverage for the new type constraints using @ts-expect-error annotations

Reviewed Changes

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

File	Description
packages/react/src/BranchName/BranchName.tsx	Added conditional type to enforce href requirement based on as prop value and set default generic parameter to 'a'
packages/react/src/BranchName/tests/BranchName.test.tsx	Updated existing tests to comply with new type constraints and added three new tests to verify type enforcement
.changeset/plenty-cloths-dance.md	Added changeset documenting the breaking type change as a patch release

[siddharthkp]

Don't need a changset if you are only updating stories. Just add skip changeset label to your PR :)

[siddharthkp]

only one change needed