feat: add Recent Predictions history with LocalStorage and UI component

[Muskankr]

Which issue does this PR close?

• Closes Add “Recent Predictions History” using LocalStorage #1055

Rationale for this change

This change introduces a Recent Predictions History feature so users can view their last 5 predictions directly in the UI. It improves usability by allowing farmers and contributors to revisit past results without re‑running the model, and aligns with the project’s goal of providing a more interactive and supportive AgriTech assistant.

What changes are included in this PR?

• Added predictionStorage.js utility for LocalStorage operations (save, get, clear).
• Updated chat.js to call savePrediction() after each successful prediction.
• Created RecentPredictions.js component to render stored predictions with timestamp, input, and output.
• Added a “Clear History” button to reset predictions.
• Updated chat.html to include a <div id="recent-predictions"></div> placeholder for rendering.

Are these changes tested?

Yes:

• ✅ Verified predictions are saved in LocalStorage after each chatbot reply.
• ✅ Confirmed only the last 5 predictions are kept.
• ✅ Checked that “Clear History” wipes LocalStorage and updates the UI.
• ✅ Reloaded the page to confirm predictions persist across sessions.

Are there any user-facing changes?

Yes:

• Users now see a Recent Predictions section below the chat window.
• Each entry shows timestamp, input, and output.
• A “Clear History” button is available to reset stored predictions.

Thank you for reviewing my PR!

[github-actions]

Thanks for creating a PR for your Issue! ☺️

We'll review it as soon as possible.
In the meantime, please double-check the file changes and ensure that all commits are accurate.

If there are any unresolved review comments, feel free to resolve them. 🙌🏼

[github-actions]

🎉 Congrats @Muskankr on getting your PR merged! 🙌
Thanks for the contribution — looking forward to more from you 🚀