fix(Disclosure): Don't incorrectly show disclosure content

[stdavis]

Closes #9004

It was unclear to me exactly how the project maintainers wanted this to work so I made my best guess and erred on the side of simplicity. I'm happy to update this further with feedback.

Thanks for the awesome project!

✅ Pull Request Checklist:

• Included link to corresponding React Spectrum GitHub Issue.
• Added/updated unit tests and storybook for this change (for new code or code which already has tests).
• Filled out test instructions.
• Updated documentation (if it already exists for this component).
• Looked at the Accessibility Practices for this feature - Aria Practices
  I couldn't find anything about disclosures being disabled.

📝 Test Instructions:

You may test this by going to the "Disclosure Group Example" storybook story and pressing the "Toggle Disabled" button.

🧢 Your Project:

Utah Geospatial Resource Center (UGRC)

[Copilot]

Pull Request Overview

This PR fixes an issue where disabled Disclosure components were not showing their content when the isExpanded prop was set to true. The fix ensures that the isDisabled state doesn't override the visibility of disclosure panels when they are explicitly set to be expanded.

• Updated the useDisclosure hook to remove the disabled state check from the panel's hidden attribute logic
• Modified tests to reflect the new expected behavior where disabled disclosures can still show content when expanded
• Added a new Storybook story to demonstrate and test the fix

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
packages/@react-aria/disclosure/src/useDisclosure.ts	Simplified panel visibility logic to only depend on expansion state
packages/react-aria-components/test/Disclosure.test.js	Updated test expectations to allow disabled disclosures to show content when expanded
packages/@react-aria/disclosure/test/useDisclosure.test.ts	Added test to verify panel remains hidden when toggling disabled state
packages/react-aria-components/stories/DisclosureGroup.stories.tsx	New Storybook story for testing disclosure group with disabled state toggle

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}

[stdavis]

I'm working on getting approvals and direction on signing the CLA...

[stdavis]

Closing and re-opening to retrigger the Signed CLA check...

[reidbarber]

LGTM, thanks for the PR!