Add social preview image asset

[graycampbell]

📝 Summary

• Added social preview image asset.

This is for posterity. The social preview image asset isn't being used directly in the repo, but it has been uploaded to the Settings tab under Social Preview.

🛠️ Type of Change

• Bug fix (change that fixes an issue)
• New feature (change that adds functionality)
• Breaking change (bug fix or feature that is not backwards compatible)
• Documentation (DocC, API docs, markdown files, templates, etc.)
• Testing (new tests, updated tests, etc.)
• Refactoring or code formatting (no logic changes)
• Updating dependencies (Swift packages, Homebrew, etc.)
• CI/CD (change to automated workflows)

✅ Checklist

• I have added relevant tests
• I have verified all tests pass
• I have formatted my code using SwiftFormat
• I have updated documentation (if needed)
• I have added the appropriate label to my PR
• I have read the contributing guidelines
• I agree to follow this project's Code of Conduct

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.64%. Comparing base (f188fd8) to head (cc51971).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #105   +/-   ##
=======================================
  Coverage   68.64%   68.64%           
=======================================
  Files          69       69           
  Lines        4538     4538           
=======================================
  Hits         3115     3115           
  Misses       1423     1423           

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