🧹 Refactor celestial body position math to avoid duplication

[Hackatoan]

🎯 What: Extracted duplicated math for computing celestial body coordinates xPos, yPos, p and celestial body styles left and top out of the conditional if-else branch in public/background.js.
💡 Why: Reduces duplicate code making the time-of-day logic more maintainable.
✅ Verification: Verified by checking functionality using node --test command to ensure regressions were not introduced.
✨ Result: A more readable implementation of celestial body calculations with a DRY structure.

---

PR created automatically by Jules for task 18409054492429004293 started by @Hackatoan

[google-labs-jules]

👋 Jules, reporting for duty! I'm here to lend a hand with this pull request.

When you start a review, I'll add a 👀 emoji to each comment to let you know I've read it. I'll focus on feedback directed at me and will do my best to stay out of conversations between you and other bots or reviewers to keep the noise down.

I'll push a commit with your requested changes shortly after. Please note there might be a delay between these steps, but rest assured I'm on the job!

For more direct control, you can switch me to Reactive Mode. When this mode is on, I will only act on comments where you specifically mention me with @jules. You can find this option in the Pull Request section of your global Jules UI settings. You can always switch back!

New to Jules? Learn more at jules.google/docs.

---

For security, I will only act on instructions from the user who triggered this task.

[github-actions]

Visit the preview URL for this PR (updated for commit 32a34ae):

https://hackatoa-com--pr33-fix-code-health-cele-fkewv3p1.web.app

_{(expires Wed, 15 Apr 2026 05:46:08 GMT)}

_{🔥 via Firebase Hosting GitHub Action 🌎}

_{Sign: c76c52c10a78f389ef2e530d01c7c8964339e5dd}