ECHOES-1409 Update spinner default styling

[marciopmoreira6]

Summary

• update Spinner default arc color to inverse
• render the weak track as a fixed solid border
• preserve spinner arc color overrides via --spinner-color-override
• add style regression tests for the default arc, override path, and fixed weak track

Tests

• yarn jest src/components/spinner/tests/Spinner-test.tsx src/components/buttons/tests/Button-test.tsx src/components/buttons/tests/ButtonIcon-test.tsx src/components/badges/tests/BadgeSeverity-test.tsx
• yarn lint
• yarn prettier --check src/components/spinner/SpinnerStyles.tsx src/components/spinner/SpinnerOverrideColor.tsx src/components/spinner/tests/Spinner-test.tsx

Jira: https://sonarsource.atlassian.net/browse/ECHOES-1409

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[hashicorp-vault-sonar-prod]

ECHOES-1409

[david-cho-lerat-sonarsource]

The spinner is now going backwards

https://deploy-preview-713--echoes-react.netlify.app/?path=/story/echoes-spinner--with-label

[sonarqube-next]

Quality Gate passed

Issues
0 New issues
0 Fixed issues
0 Accepted issues

Measures
0 Security Hotspots
0 Dependency risks
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube

[david-cho-lerat-sonarsource]

Well done! 👍

[gitar-bot]

Code Review ✅ Approved

Updates the spinner default arc color to inverse and standardizes the weak track rendering. Style regression tests were added to ensure consistent behavior across overrides and components, with no issues found.

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