test(rate-limit): verify massive data sets and extreme high bounds scaling #4398

[Rakshak05]

Closes #4398

Description

This PR adds isolated unit and integration testing targeting Massive Data Sets and Extreme High Bounds Scaling for the rate-limiting utility (lib/rate-limit.ts).

Specifically, it implements the following 5 test cases in the new file lib/rate-limit.massive-scaling.test.ts:

1. Thousands of unique IPs test: Verifies that 5,000 unique IPs are handled without memory overflow or degradation.
2. Extreme limit bounds test: Verifies that a high limit value of 10,000 requests from a single IP is correctly exhausted sequentially.
3. Massive concurrent unique IPs test: Verifies structure integrity of 100,000 unique contributor IP results using sampled assertions.
4. SVG coordinate / numeric bounds test: Assures reset timestamps remain within safe numeric boundaries under extreme window sizes (up to MAX_INT32).
5. Grid/listing rendering test: Checks that success/failure distributions are preserved across 50,000 unique IPs when allowlist and blocklist are prepopulated.

Pillar

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

Visual Preview

N/A (Backend / Utility Tests)

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): ...).
• My commits follow the Conventional Commits format.
• 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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[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]

This test suite is in good shape, but the PR is blocked by the Vercel status check waiting on deploy authorization. Please authorize the Vercel deployment and rerun the checks; once that is green, the scaling coverage in lib/rate-limit.massive-scaling.test.ts can be merged cleanly.

[Aamod007]

Nice focused scaling coverage for the rate limiter. lib/rate-limit.massive-scaling.test.ts exercises the high-volume IP paths, the large request limit exhaustion path, and the reset-bound math without changing production code, so this is good to merge.

[github-actions]

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

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