Update changeset to reflect latest PageLayout.Pane resizable API

[Copilot]

The changeset was outdated, describing an earlier iteration of the resizable API that used {persist: false} and {save: fn} as separate config objects. The implemented API uses a unified persist: false | 'localStorage' | fn syntax and adds controlled width support via resizable.width.

Changelog

Changed

• Updated .changeset/pagelayout-resizable-persistence.md to document:
  • Unified persist property accepting false | 'localStorage' | PersistFunction
  • Controlled width mode via resizable.width property (separates current value from constraints)
  • Current type exports: PersistFunction, PersistConfig, SaveOptions, ResizableConfig, PaneWidth, PaneWidthValue
• Replaced examples to demonstrate controlled width patterns:

  // Controlled width with custom persistence
  const [currentWidth, setCurrentWidth] = useState(defaultPaneWidth.medium)
  <PageLayout.Pane
    width="medium"
    resizable={{
      width: currentWidth,
      persist: (width) => setCurrentWidth(width)
    }}
  />

Removed

• References to deprecated types (NoPersistConfig, CustomPersistConfig)
• Numeric width prop support (removed from implementation)

Rollout strategy

• Patch release
• Minor release
• Major release
• None

Testing & Reviewing

Changes are documentation-only in the changeset file. Review that the documented API matches the implementation in commits 28e77e6 and 3115cac.

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
• Integration tests pass at github/github

---

💬 We'd love your input! Share your thoughts on Copilot coding agent in our 2 minute survey.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 05ab961

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 changesets to release 1 package

Name	Type
@primer/react	Minor

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