Feature/recently viewed products

[2024itb047samata]

What changed

• Added a recently viewed products section to the Streamlit application
• Tracks recently viewed items using st.session_state
• Limited recently viewed history to the last 10 items
• Added a clear history button
• Prevented duplicate recently viewed entries
• Displayed recently viewed products in a horizontal layout using Streamlit columns

Why

Previously, users had no way to revisit products/items they had already explored. This feature improves usability by allowing users to quickly access recently viewed products without searching again.

How to test

pip install -r requirements.txt
streamlit run app.py

Steps:

1. Upload a CSV dataset
2. Select an item from the dropdown
3. Click "Recommend"
4. Verify the item appears in the "Recently Viewed Products" section
5. Select additional items and verify ordering updates correctly
6. Click "Clear History" and verify the list resets

Checklist

• I have read the CONTRIBUTING.md
• My code follows PEP8 style
• I have tested my changes locally
• I have added/updated tests where applicable
• I can explain every line of code I've written
• I have NOT used AI-generated code without understanding and attributing it

Related issue

Closes #105

AI assistance disclosure

• I used AI assistance for:

  • Understanding Streamlit session state handling
  • Structuring the recently viewed products feature
  • Improving implementation flow and testing steps

[github-actions]

🎉 Welcome to Hybrid Recommender, @2024itb047samata! This is your first contribution here!

PR Description Checklist:
✅ What changed section
✅ Why section
✅ How to test section
✅ Related issue linked

✅ PR description looks complete!

What happens next:

1. A mentor (@leonagoel) will review your changes
2. CI checks must pass (lint + smoke test)
3. Once approved, labels will be added for GSSoC points
4. PR will be merged after approval

⏱️ Please respond to review comments within 48 hours.

📖 Make sure your changes follow our CONTRIBUTING.md

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[leonagoel]

Thanks for the PR, @2024itb047samata! The recently viewed products feature looks good but there are conflicts in 4 files that are too complex for the web editor — they must be resolved via command line.

Conflicting files:

• app.py
• backend/main.py
• frontend/app.js
• frontend/index.html

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# resolve conflicts in all 4 files
git add app.py backend/main.py frontend/app.js frontend/index.html
git rebase --continue
git push --force-with-lease

Once conflicts are resolved and CI passes, this will be auto-merged. Please address within 48 hours.

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