test(api-user-details): Enhance Timezone Normalization and Calendar Data Tests

[Rakshak05]

Description

Fixes #6815

Pillar

• 🎨 Pillar 1 — New Theme Design
• 📐 Pillar 2 — Geometric SVG Improvement
• 🕐 Pillar 3 — Timezone Logic Optimization
• 🛠️ Other (Bug fix, refactoring, docs)

Visual Preview

N/A (This PR introduces back-end unit and integration tests only).

Checklist before requesting a review:

• I have read the CONTRIBUTING.md file.
• I have tested these changes locally (localhost:3000/api/streak?user=YOUR_USERNAME).
• I have run npm run format and npm run lint locally and resolved all errors (CI will fail otherwise).
• My commits follow the Conventional Commits format (e.g., feat(themes): ..., fix(calculate): ...).
• I have updated README.md if I added a new theme or URL parameter.
• I have started the repo.
• I have made sure that i have only one commit to merge in this PR.
• The SVG output matches the CommitPulse "premium quality" aesthetic standard (no raw elements, smooth animations, correct fonts).
• (Recommended) I joined the CommitPulse Discord community for contributor discussions, mentorship, and faster PR support.

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[retenta-bot]

This PR introduces important tests for timezone normalization and calendar data boundary alignment, which are crucial for maintaining accurate date calculations across different time zones. This aligns with previous decisions made to ensure robust handling of timezone functionalities. Thank you for your contributions, and I look forward to your updates!

[github-actions]

📦 Next.js Bundle Size Report (Gzipped Sizes)

✨ No significant bundle size changes detected.

📊 Summary of Totals

Category	PR Size	Base Size	Difference
Total JS	3958.92 KB	3958.92 KB	0 B
Total CSS	327.67 KB	327.67 KB	0 B

[Aamod007]

Well done on enhancing the timezone testing for user details. The checks across multiple timezones using convertLocalToUtc are robust. However, this PR is blocked by a failing Vercel build check. Please resolve the issues and rerun the CI pipeline.

[Aamod007]

Upon re-evaluation, I realized I previously misinterpreted the Vercel deployment failure as an issue with this PR. The Vercel build failure seems unrelated to the changes introduced here, so I will ignore it moving forward. The rest of the PR looks good, so I'm approving it!

[github-actions]

🎉 Congratulations @Rakshak05! Your PR has been successfully merged. 🚀

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