🧪 Add tests for formatNumber utility

[Ap-0007]

🎯 What: Added tests for the formatNumber utility function in lib/utils.ts.
📊 Coverage: The test suite checks normal behavior (numbers under 1000), abbreviation logic (append K for thousands, M for millions, along with specific decimal formatting checks like 999999 becoming 1000.0K), and negative numbers.
✨ Result: Test coverage improved. Added Native Node test suite to ensure future reliability and safety while refactoring.

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PR created automatically by Jules for task 9220477668825862200 started by @Ap-0007

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Project	Deployment	Actions	Updated (UTC)
side_pro	Ready	Preview, Comment	May 18, 2026 1:10pm