feat: add modular chatbot assistant to ExpenseFlow

[mohdmaazgani]

Summary

Introduces a modular, frontend-only chatbot assistant for ExpenseFlow.

Features

• Expense and budgeting tips
• Analytics explanations
• App navigation guidance
• Floating UI with clean UX

Implementation Details

• Chatbot isolated under /chatbot
• Browser-compatible ES modules
• No backend changes
• Tested locally with Live Server

Notes

Opened as a fresh PR after rebasing to resolve stale merge conflict metadata from a previous PR.

[vercel]

@mohdmaazgani 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, @mohdmaazgani!

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

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• 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

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[mohdmaazgani]

Hi @Renu-code123 👋
I’ve rebased my branch on latest main and fixed invalid markup in index.html.

GitHub still reports a merge conflict in index.html that appears to require a maintainer-side merge due to concurrent changes in main.

Could you please resolve the conflict during merge?
Happy to update the PR if you prefer a specific resolution.
Thanks!
This pr fixes #180

[Renu-code123]

@mohdmaazgani, I cannot resolve the conflict as it's not giving me an option,u have to resolve it

[mohdmaazgani]

@Renu-code123 conflict resolved