test(api/track-user): add TypeScript compiler validation tests for route handlers

[kanishka-2007-tech]

Description

This PR introduces a dedicated TypeScript compiler validation test suite for the /api/track-user route to ensure the exported route handlers maintain stable type signatures and schema constraints over time.

Changes Made
Added app/api/track-user/route.type-compiler.test.ts.
Verified that both POST and OPTIONS handlers are exported correctly.
Added compile-time assertions to validate the route handlers' function signatures.
Ensured both handlers accept a standard Request object.
Verified the handlers return asynchronous Response/NextResponse objects.
Added isolated type-level tests using expectTypeOf.

Fixes #6812

Pillar

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

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.

[vercel]

@kanishka-2007-tech is attempting to deploy a commit to the jhasourav07's projects Team on Vercel.

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[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]

Nice job adding the TypeScript compiler validation tests for the track-user route handlers. Type safety is important. However, the Vercel deployment check has failed. 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 @kanishka-2007-tech! Your PR has been successfully merged. 🚀

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