test(track-user): verify API route performance scaling and high data bounds (#4325)

[atharv96k]

🧩 Background

This PR addresses Issue #4325, focusing on establishing comprehensive, isolated unit and integration validation testing targeting Massive Data Sets and Extreme High Bounds Scaling layouts inside the processing vectors of app/api/track-user/route.ts.

🎯 Objective

Introduces a brand-new, dependency-free test file app/api/track-user/route.massive-scaling.test.ts to guarantee that high-volume incoming contributor action stream streams, expansive telemetry records, and massive activity payload objects render and evaluate safely without causing text overlay dropping, layout canvas distortion, or processing loop timeouts.

🛠️ Implementation Details

• Programmatic Matrix Generation: Stresses internal routing computations utilizing high-volume programmatic generation arrays populating 5,000 distinct mock contributor activities.
• Canvas Scaling Verification: Asserts coordinate layouts dynamically modify boundaries without triggering interface overlaps or breaking baseline layouts.
• Execution Telemetry Thresholds: Confirms large collection mapping and parsing operations execute within tight latency boundaries ($\le$50ms).
• Type Safety Assurances: Leverages strongly typed data model contracts to avoid any explicit typings, passing ESLint validation without any bypass rule settings.

✅ Definition of Done

• 5 isolated test cases created and fully validated.
• vitest run track-user/route.massive-scaling passes perfectly (5/5).
• npx tsc --noEmit runs completely clean with zero type errors.
• npm run lint clears with 0 errors across target files.

Fixes #4325

[atharv96k]

@Aamod007 @JhaSourav07 PR is ready for #4325

[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	3433.75 KB	3433.75 KB	0 B
Total CSS	258.05 KB	258.05 KB	0 B

[Aamod007]

Thanks for the API route scaling coverage for track-user. I reviewed the PR description, linked issue #4325, checks, and the actual diff before labeling.

Labels applied:

• level:intermediate: the new app/api/track-user/route.massive-scaling.test.ts file is 117 lines and exercises multiple heavy payload scenarios, execution timing, and layout-bound checks in one focused route test suite.
• quality:clean: the test helper and interfaces keep the scenarios readable, deterministic, and close to the actual route behavior being validated.
• type:testing: the PR is dedicated test coverage for the route and matches the issue scope.
• type:performance: one of the core assertions measures route processing time and enforces a strict latency budget.

All required checks are green and the PR is not draft or blocked, so I’m approving and adding gssoc:approved.

[github-actions]

🎉 Congratulations @atharv96k! Your PR has been successfully merged. 🚀

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