chore: use Banner instead of custom implementation for SelectPanel notice

[francinelucca]

Closeshttps://github.com/github/primer/issues/5647

Changelog

Changed

• Replaced custom SelectPanel notice implementation in favor of Banner

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]

🦋 Changeset detected

Latest commit: 8971a92

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
@primer/react	Patch
@primer/styled-react	Patch

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[Copilot]

Pull Request Overview

This PR refactors the SelectPanel component's notice display to use the reusable Banner component instead of a custom implementation. This change improves code consistency and maintainability by leveraging an existing design system component.

Key Changes

• Replaced custom notice implementation with Banner component from the design system
• Updated variant mapping to handle Banner's 'critical' variant for error states
• Removed redundant icon mapping and styling code

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
SelectPanel.tsx	Replaced custom notice implementation with Banner component and updated variant mapping
SelectPanel.module.css	Updated CSS selector to match Banner's 'critical' variant instead of 'error'

[github-actions]

👋 Hi, this pull request contains changes to the source code that github/github depends on. If you are GitHub staff, we recommend testing these changes with github/github using the integration workflow. Thanks!

[github-actions]

size-limit report 📦

Path	Size
packages/react/dist/browser.esm.js	88.58 KB (-0.07% 🔽)
packages/react/dist/browser.umd.js	88.7 KB (-0.04% 🔽)