✨ feat: add scroll-to-top button (#697)

[UshaSri26]

📌 Pull Request Summary

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🛠️ Type of Change

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• 🐛 Bug fix
• [✅ ] ✨ New feature
• 🧹 Code refactor
• 🧪 Tests added/updated
• 📄 Documentation update
• 🚀 Performance improvement
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🔗 Related Issue

Closes #[issue-number]

✅ Checklist

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• [ ✅] I have tested my changes locally
• [ ✅] I have run npm run dev or similar to check code style
• I have updated documentation (if necessary)
• [✅ ] My code follows the project’s coding conventions
• I have merged the latest main or dev branch
• [✅ ] I have performed a self-review of my own code.
• [✅ ] My changes generate no new warnings or errors.
• [] I have commented my code, especially in hard-to-understand areas
• [✅

] I have **linked the related issue**

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