test(contributors-search): add massive scaling coverage for large contributor datasets

[Thacker-Meet]

Description

Fixes #4335

Added a dedicated massive-scaling test suite for app/contributors/ContributorsSearch.tsx.

Coverage Added

• Verifies successful rendering with thousands of contributor records.
• Tests search filtering against large contributor datasets.
• Confirms contributor grid/card structure remains stable under high-volume rendering.
• Validates no-results state behavior with extremely large datasets.
• Checks filtering performance remains within acceptable limits during high-volume searches.

The test suite focuses on realistic large-scale contributor scenarios and validates rendering stability, search accuracy, layout preservation, and performance characteristics without introducing artificial test-only behavior.

Pillar

• 🛠️ 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 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.

[Aamod-Dev]

Thanks for the contribution. I went through the changes and the overall approach looks good.

[github-actions]

🎉 Congratulations @Thacker-Meet! Your PR has been successfully merged. 🚀

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