feat: implement style api for tabs component

[mxschll]

Description

Extends the prompt input component with a style API for customization, allowing developers to override default component styles.

Related links, issue #, if available: n/a

How has this been tested?

• Added unit tests for style prop validation and CSS class application
• Screenshot tests passed without visual regressions

Review checklist

The following items are to be evaluated by the author(s) and the reviewer(s).

Correctness

• Changes include appropriate documentation updates.
• Changes are backward-compatible if not indicated, see CONTRIBUTING.md.
• Changes do not include unsupported browser features, see CONTRIBUTING.md.
• Changes were manually tested for accessibility, see accessibility guidelines.

Security

• If the code handles URLs: all URLs are validated through the checkSafeUrl function.

Testing

• Changes are covered with new/existing unit tests?
• Changes are covered with new/existing integration tests?

---

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.26%. Comparing base (7790068) to head (e0ed207).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4027   +/-   ##
=======================================
  Coverage   97.25%   97.26%           
=======================================
  Files         859      861    +2     
  Lines       25400    25452   +52     
  Branches     9050     9072   +22     
=======================================
+ Hits        24703    24755   +52     
- Misses        650      691   +41     
+ Partials       47        6   -41     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.