SelectPanel: Add example of inactiveText usage

[TylerJDev]

Context: https://github.com/github/primer/issues/5220

Adds example of inactiveText usage in SelectPanel

Changelog

Changed

• Adds example of inactive usage in SelectPanel

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: 154262a

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]

size-limit report 📦

Path	Size
packages/react/dist/browser.esm.js	94.51 KB (0%)
packages/react/dist/browser.umd.js	94.64 KB (0%)

[Copilot]

Pull Request Overview

This PR adds a new Storybook example demonstrating how to use the inactiveText prop in SelectPanel.

• Introduces a new Items type with an optional inactiveText field
• Creates itemsWithInactive, an array extending the base items to include one inactive item
• Adds the WithInactiveItems story to showcase the inactiveText usage

Comments suppressed due to low confidence (2)

packages/react/src/SelectPanel/SelectPanel.features.stories.tsx:809

• [nitpick] The type name Items is plural and generic. Consider renaming it to a singular, descriptive name like SelectPanelItemWithInactiveText to more clearly convey its purpose.

type Items = ItemInput & {

packages/react/src/SelectPanel/SelectPanel.features.stories.tsx:819

• There are no existing tests covering the new inactiveText prop. Consider adding unit or integration tests to verify that this text is rendered correctly in SelectPanel when items are inactive.

inactiveText: 'Currently inactive due to an outage',