fix(alert-dialog): added missing imports

[Rajdeepc]

Description

Added missing import statements for required Spectrum Web Components that are used within the AlertDialog component:

@spectrum-web-components/button-group/sp-button-group.js
@spectrum-web-components/icons-workflow/icons/sp-icon-alert.js
@spectrum-web-components/divider/sp-divider.js

Added Stackblitz link to documentation site.

Motivation and context

The AlertDialog component renders these elements in its template but was missing the corresponding import statements. This caused the components to not be properly registered and available at runtime, leading to broken VRT (Visual Regression Tests).

Impact

✅ Fixes VRT failures for AlertDialog component
✅ Ensures proper component registration and availability
✅ Maintains visual consistency across all AlertDialog variants

Related issue(s)

• fixes [Issue Number]

Screenshots (if appropriate)

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Author's checklist

• I have read the CONTRIBUTING and PULL_REQUESTS documents.
• I have reviewed at the Accessibility Practices for this feature, see: Aria Practices
• I have added automated tests to cover my changes.
• I have included a well-written changeset if my change needs to be published.
• I have included updated documentation if my change required it.

---

Reviewer's checklist

• Includes a Github Issue with appropriate flag or Jira ticket number without a link
• Includes thoughtfully written changeset if changes suggested include patch, minor, or major features
• Automated tests cover all use cases and follow best practices for writing
• Validated on all supported browsers
• All VRTs are approved before the author can update Golden Hash

Manual review test cases

• Descriptive Test Statement

  1. Go here
  2. See the divider and the button-group is not rendering

• Check new VRTs

  1. Go here
  2. Compare the new UI with imports which should be the correct baseline

Device review

• Did it pass in Desktop?
• Did it pass in (emulated) Mobile?
• Did it pass in (emulated) iPad?

[github-actions]

📚 Branch Preview

• Documentation Site
• Storybook

🔍 Visual Regression Test Results

When a visual regression test fails (or has previously failed while working on this branch), its results can be found in the following URLs:

• Spectrum | Light | Medium | LTR
• Spectrum | Dark | Large | RTL
• Express | Light | Medium | LTR
• Express | Dark | Large | RTL
• Spectrum-two | Light | Medium | LTR
• Spectrum-two | Dark | Large | RTL
• High Contrast Mode | Medium | LTR

Deployed to Azure Blob Storage: pr-5669

If the changes are expected, update the current_golden_images_cache hash in the circleci config to accept the new images. Instructions are included in that file.
If the changes are unexpected, you can investigate the cause of the differences and update the code accordingly.

[github-actions]

Tachometer results

Currently, no packages are changed by this PR...

[changeset-bot]

⚠️ No Changeset found

Latest commit: 65b6810

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[Rajdeepc]

This fixes import dependencies of divider and button group UI issue in AlertDialog, new VRT changes are expected.