Prevent crash on empty dice face array

[alexdeng]

Summary

• Avoid reduce error in dice component by providing initial value when summing faces

Testing

• node -e "var faces=[]; console.log(faces.reduce((a,b)=>a+b,0));"
• npm test (fails: package.json missing)

---

https://chatgpt.com/codex/tasks/task_e_689cf579fb68832d9f435320de9b4cc6

[Copilot]

Copilot encountered an error and was unable to review this pull request. You can try again by re-requesting a review.