New Composer implementation, added styles

[martinmitrevski]

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🎯 Goal

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📝 Summary

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🛠 Implementation

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🧪 Manual Testing Notes

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☑️ Contributor Checklist

• [ ] I have signed the Stream CLA (required)
• [x] This change should be manually QAed
• [ ] Changelog is updated with client-facing changes
• [ ] Changelog is updated with new localization keys
• [ ] New code is covered by unit tests
• [ ] Documentation has been updated in the docs-content repo