feat: Add a "Back to Top" floating action button

[Papia-tech]

✨ Feature Description

Add a minimal, floating "Back to Top" button that appears in the bottom-right corner when a user scrolls down the page.

🤔 Problem It Solves

Long-scrolling landing pages force users to manually scroll all the way up to access the navigation bar, reducing accessibility and user experience efficiency.

💡 Proposed Solution

• Implement a floating action button (position: fixed) in the bottom-right.
• Use a scroll listener to dynamically toggle its visibility (e.g., fade in after scrolling down 300px).
• Trigger a smooth scroll animation back to the top (behavior: 'smooth') upon clicking.
• Style it with a dark theme and red accent hover state to match the existing UI design.

✅ Acceptance Criteria

• Button remains hidden at the absolute top of the page.
• Button becomes visible smoothly after scrolling down the page.
• Clicking the button returns the user to the top with a smooth scrolling transition.
• Design matches the dark and red accent aesthetic of the application.

📋 Additional Context

I would love to open a PR for this! Please assign it to me.

🌱 Contributor Checklist

• I am participating via GSSoC
• I have read the contribution guidelines
• I checked for existing issues before creating this

[github-actions]

👋 Thanks for opening an issue, @Papia-tech!

Our maintainers will review this issue shortly 🚀

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Happy contributing 🎉

[Papia-tech]

/assign

[github-actions]

❌ Please specify the program:

• /assign gssoc
• /assign nsoc

[Papia-tech]

/assign gssoc

[github-actions]

✅ Assigned @Papia-tech

🏷️ Program: gssoc26

📌 You now have 2 active assignment(s).
Please work on meaningful contributions and avoid opening many tiny PRs.

🏷️ Auto-detected difficulty: level:intermediate. A maintainer may update this.

[Papia-tech]

/assign nsoc

[github-actions]

⚠️ This issue is already assigned to: Papia-tech