feat(web): add unit tests for Badge component

[SherlockShemol]

What's this PR about?

Hey there! 👋

I noticed the Badge component was missing test coverage, so I went ahead and added a comprehensive test suite for it.

What's covered?

• ✅ Basic rendering and children display
• ✅ All three size variants (s, m, l)
• ✅ State variants (Warning, Accent, Default)
• ✅ iconOnly padding behavior for each size
• ✅ uppercase text styling
• ✅ Custom styleCss and className support
• ✅ HTML attributes passthrough (data-*, id, aria-*, title)
• ✅ Combined props scenarios

Test results

All 25 tests pass! 🎉

Related

This follows the same testing patterns used in button/index.spec.tsx, keeping things consistent across base components.

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Happy to make any changes if needed!