Fix syncQueue to Prevent Execution Lock and Race Conditions

[tamilr0727-ux]

Description

Fixes concurrency and reliability issues in the syncQueue implementation to ensure synchronization jobs are queued safely and processed without race conditions, dropped tasks, or unhandled promise rejections.

Changes

• Improved synchronization queue handling for concurrent job submissions.
• Ensured incoming jobs are reliably added to the queue without being overwritten or dropped.
• Added controlled sequential/concurrent job processing to prevent race conditions.
• Added proper promise rejection handling for failed synchronization tasks.
• Ensured the worker continues processing remaining queued jobs after an individual task fails.
• Added regression tests covering concurrent queue operations and worker failures.

Verification

✅ vitest run passes successfully.
✅ Concurrent synchronization requests are queued reliably.
✅ No synchronization jobs are silently dropped.
✅ Queue processing continues after individual job failures.
✅ Concurrency limits are respected.

Fixes #9008

Pillar

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

Visual Preview

Can Check in the Files Changed Section.

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 pull request improves the handling of synchronization jobs in the syncQueue, addressing critical concurrency issues. It ensures that jobs are queued safely and processed reliably, which is essential for maintaining application stability. This is similar to previous decisions made regarding bug fixes in the calculateStreak function, where maintaining accurate state and preventing overrides were prioritized. 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	4998.89 KB	4998.89 KB	0 B
Total CSS	354.18 KB	354.18 KB	0 B

[github-actions]

🎉 Congratulations @tamilr0727-ux! Your PR has been successfully merged. 🚀

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