Fixed Theme Button component’s outline variant

[veenaypokhriyal]

Description

Removed the custom variant="outline" fallback logic from the button component.
Previously, the component overrode Chakra UI’s default outline variant when no explicit variant was provided. This prevented Chakra’s built‑in colorScheme styling from being applied correctly.

Default variant is already managed in

defaultProps: {
    colorScheme: 'blue'
}

Types of Changes

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Documentation update
• Breaking change (could cause existing functionality to not work as expected)
• Other changes (non-breaking changes that does not fit any of the above)

Changes

Removed the custom outline variant fallback so Chakra UI can handle the variant and colorScheme as intended.

How to Test-Drive This PR

Render a button without specifying a colorScheme and verify that Saleforce default outline styling is applied.
Render a button with specifying a colorScheme and verify that appropriate outline styling is applied.

Confirm that buttons using explicit variants continue to behave as expected.

Checklists

General

• Changes are covered by test cases
• CHANGELOG.md updated with a short description of changes (not required for documentation updates)

Accessibility Compliance

You must check off all items in one of the follow two lists:

• There are no changes to UI

or...

• Changes were tested with a Screen Reader (iOS VoiceOver or Android Talkback) and had no issues
• Changes comply with WCAG 2.0 guidelines levels A and AA
• Changes to common UI patterns and interactions comply with WAI-ARIA best practices

Localization

• Changes include a UI text update in the Retail React App (which requires translation)

[salesforce-cla]

Thanks for the contribution! Before we can merge this, we need @veenaypokhriyal to sign the Salesforce Inc. Contributor License Agreement.

[cc-prodsec]

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[veenaypokhriyal]

Kindly include this PR in PWA Kit 3.14 release