Tweak the updated Button styles

[connor-baer]

Addresses #ticket-number.

Purpose

After implementing the new button, we received feedback from multiple teams on different aspects of the component.

Approach and changes

• Normalized the border-radius to 8px for all sizes.
• Removed the horizontal padding of the tertiary variant and improved the color contrast its underline.
• Updated the disabled styles to distinguish the button variants.

Definition of done

• Development completed
• Reviewers assigned
• Unit and integration tests
• Meets minimum browser support
• Meets accessibility requirements

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
oss-circuit-ui	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 9, 2024 4:29pm

[changeset-bot]

🦋 Changeset detected

Latest commit: 243dd36

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

This PR includes changesets to release 7 packages

Name	Type
@sumup/circuit-ui	Major
@sumup/design-tokens	Minor
@sumup/eslint-plugin-circuit-ui	Major
@sumup/stylelint-plugin-circuit-ui	Major
@sumup/astro-template-circuit-ui	Patch
@sumup/remix-template-circuit-ui	Patch
next-app	Patch

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.30%. Comparing base (0e76c53) to head (a1a5efb).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2551   +/-   ##
=======================================
  Coverage   88.30%   88.30%           
=======================================
  Files         206      206           
  Lines       22813    22819    +6     
  Branches     1527     1528    +1     
=======================================
+ Hits        20144    20150    +6     
  Misses       2617     2617           
  Partials       52       52           

Files	Coverage Δ
packages/circuit-ui/components/Button/Button.tsx	88.67% <100.00%> (+0.67%)	⬆️
.../circuit-ui/components/ButtonGroup/ButtonGroup.tsx	89.47% <100.00%> (ø)
packages/design-tokens/themes/dark.ts	100.00% <100.00%> (ø)
packages/design-tokens/themes/light.ts	100.00% <100.00%> (ø)