Add spell lookup feature using spells.json and fix savename option

[vkaraujo]

Hey, I found your project on tiktok and really loved it. I don't usually code in python, but its something i have been wanting to practice and when I saw the opportunity to contribute to something so cool I grabed it.

Thanks for the awesome project! Happy to discuss any adjustments you might want.

Summary

• Added --lookup CLI option to search for spells inside spells.json.
• Fetches full spell details from the D&D 5e API based on spell URL.
• Prints detailed spell information including name, description, casting time, range, etc.
• Fixed --savename bug (argument was parsed but not assigned), allowing users to customize output filenames.
• Organized new logic inside a services/spell_lookup_service.py to keep writer.py clean and modular.

Reasoning

This PR implements issue #6 and improves code structure. It also prepares the project for future expansion by moving new logic into service classes.

Notes

• Spells lookup is case-insensitive for better UX
• Auto-handles API errors

Future Suggestions (Optional Enhancements)

While working on this contribution, I noticed a few areas that could improve user experience and project organization further:

• Normalize user input for spell generation (e.g., case-insensitive matching, auto-trimming spaces).
  Right now, users must type exactly what's in the .txt files (case-sensitive, exact spaces). Improving this would make the CLI much more forgiving and user-friendly.

• Automatically save generated plots into a Generated/Plots/ folder instead of the project root.

• Add a requirements.txt file to simplify installing dependencies like numpy, matplotlib, tqdm, and requests.
  Right now, users have to guess what Python packages to install. A simple requirements.txt would make installation (pip install -r requirements.txt) much easier.

• Continue breaking large files like writer.py into smaller modules (services, helpers, etc.) for better maintainability.

Happy to help with these in the future if you'd like!