feat: setup dark theme

[psterpu-c]

📝 Description

• setup dark theme variables
• the color palette is the same for both light and dark theme
• the theme variables naming is the same for each theme and references different colors from the shared color palette
• the same component overrides apply for both themes, this being possible by having the same variable names for both themes

🧪 Type of Change

• 🐛 Bug fix (non-breaking change which fixes an issue)
• ✨ New feature (non-breaking change which adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to not work as expected)
• 📚 Documentation update
• 🎨 Style/design update
• 🔧 Build/CI update
• ♻️ Refactoring (no functional changes)
• 🧪 Tests only

📚 Documentation

• Storybook story added/updated
• Component props documented
• Usage examples provided
• README updated (if needed)
• TypeScript types exported

📋 Checklist

• Code follows the project's style guidelines
• Self-review of code completed
• Code is commented where necessary
• No console.log statements left in code
• Build passes locally
• Tests added for new functionality
• Existing tests still pass
• No TypeScript errors
• No accessibility violations
• PR title follows conventional commit format

🔍 Additional Notes

---

For Maintainers:

• Ready for review
• Requires design review
• Requires accessibility review
• Ready to merge

[rafaelsilva29]

LGTM!

[rafaelsilva29]

🎉 This PR is included in version 1.1.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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