test(commitpulse): add massive scaling coverage

[sanzzzz-g]

Description

Fixes #4349

Added isolated massive scaling test coverage for CommitPulseSection to verify stable rendering and UI behavior under extreme high-bound input conditions.

The new test suite validates:

• rendering stability with extremely large contribution metrics
• performance behavior under heavy render loads
• resilience against oversized username inputs
• layout preservation during large-scale rendering
• interactive control stability during stress conditions

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 (test-only changes)

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.

[sanzzzz-g]

Hey @Aamod007 All checks are passed!

[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	3433.84 KB	3433.84 KB	0 B
Total CSS	258.05 KB	258.05 KB	0 B

[Aamod007]

Good stress coverage for a UI section that does real work under load. CommitPulseSection.massive-scaling.test.tsx keeps the render path, oversized input handling, layout stability, and control presence under pressure, so this is a useful regression suite for the generator flow.

[github-actions]

🎉 Congratulations @sanzzzz-g! Your PR has been successfully merged. 🚀

Thank you for contributing to CommitPulse. Your work helps us build a better tool for the community.

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