Refactor analyticsService and fix duplicate UI elements

[yashsarkar164]

This PR improves both the analytics service layer and the frontend UI structure without changing any existing functionality.

Backend (analyticsService)

• Centralized analytics cache keys into a single constant object
• Centralized cache TTL values to remove magic numbers
• Added shared helper functions for:
  • Date range calculation
  • Rounding numeric values
• Reduced duplicated logic in monthly comparison calculations
• Improved code clarity and future extensibility

Frontend (UI cleanup)

• Removed duplicate footer markup
• Removed duplicate PWA install prompt block
• Removed duplicate script includes
• Fixed invalid HTML markup that could break layout rendering

Notes

• No business logic or API behavior has been changed
• All analytics outputs remain identical
• UI behavior remains unchanged, only structural cleanup
• This refactor makes future analytics features easier to add and test

Please let me know if you'd like me to split this into smaller commits or adjust the structure further.

[vercel]

@yashsarkar164 is attempting to deploy a commit to the Renu's projects Team on Vercel.

A member of the Team first needs to authorize it.

[github-actions]

🎉 Thanks for the PR, @yashsarkar164!

We really appreciate you taking the time to contribute to OpenPlayground! 💙

---

⭐ Love this project?

Please give us a star! It helps the project grow and reach more developers! 🌟

🔗 https://github.com/YadavAkhileshh/OpenPlayground

---

✅ PR Checklist

Before we review, please ensure:

• Your code follows the project's coding standards
• All file changes are accurate and intentional
• You've tested your changes locally
• Any review comments have been addressed

---

🚀 Looking for More Ideas & Resources?

Check out Linkshala — your one-stop destination for:

• 🧩 New project ideas
• 📚 Learning resources
• 🎮 Games & creative inspiration
• 💡 Developer tools & utilities

🔗 https://linkkshala.vercel.app

---

We'll review your PR as soon as possible. Keep up the great work! ✨

[Renu-code123]

@yashsarkar164, resolve conflict and add a demo video or before-and-after image of the changes.

[Renu-code123]

@yashsarkar164 resolve conflict

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Review	Updated (UTC)
expenseflow	Ready	Preview, Comment	Jan 24, 2026 5:31pm

[Renu-code123]

@yashsarkar164 mention issue no.