Improve student activity registration system

[iscroman]

Now let me fetch the PR data:Based on your changes, here's a comprehensive PR description:

In a Nutshell

This PR expands the student activity management application with new features and improvements. It adds 6 new activities to the catalog, implements participant management with validation, introduces an unregister endpoint, enhances the frontend UI to display and manage participants, and includes comprehensive test coverage to ensure reliability.

Summary

Aspect	Details
Changes	Backend: Added 6 new activities, participant validation, DELETE endpoint for unregistering participants Frontend: Display participants, remove button functionality, improved message styling Testing: Added comprehensive pytest tests for all major functionality Documentation: Updated README with testing instructions
Files Changed	7 files: src/app.py, src/static/app.js, src/static/styles.css, tests/backend/test_api.py, tests/test_app.py, requirements.txt, README.md
Lines Added/Deleted	+333 lines added / ~5 lines removed
Key Features	✅ 6 new activities (Basketball, Soccer, Drama, Art, Debate, Science) ✅ Duplicate signup prevention ✅ Participant removal endpoint ✅ Real-time participant list display ✅ Comprehensive test suite (9 tests)

Changes Overview

Backend (src/app.py)

• Added 6 new activities with full details (description, schedule, capacity, participants)
• Added validation in signup_for_activity() to prevent duplicate signups
• Created new DELETE /activities/{activity_name}/participants/{email} endpoint to unregister students

Frontend (src/static/app.js & src/static/styles.css)

• Display participant list for each activity
• Add remove buttons (×) next to each participant name with delete functionality
• Improved message styling with consistent CSS classes
• Reset activity dropdown after successful signup
• Refresh activity list after participant removal

Testing (tests/backend/test_api.py & tests/test_app.py)

• 9 comprehensive tests covering:
  • Activity retrieval
  • Successful signup
  • Duplicate signup rejection
  • 404 handling for unknown activities
  • Participant removal
  • 404 handling for missing participants
• Fixture to preserve activity state between tests

Other

• Added pytest to requirements.txt
• Updated README with testing instructions

---

Want me to:

1. Review the changes for potential issues or improvements?
2. Dive deeper into specific files or functionality?
3. Check test coverage and suggest additional test cases?