test(calculateRank): fix floating-point precision issue for B- rank test

[vardhan30016]

Summary

This PR fixes a failing test in tests/calculateRank.test.js caused by a minor floating-point precision mismatch in the expected percentile value for the "B-" rank.

Details

• Replaced toStrictEqual() with toBeCloseTo() for the percentile comparison in the "beginner user gets B- rank" test.
• This allows small floating-point differences (up to 5 decimal places) without failing the test suite.
• No changes were made to the calculateRank() implementation itself — only to the test expectation.

Motivation

Floating-point calculations may differ slightly across environments and Node.js versions.
Using toBeCloseTo() ensures test reliability without compromising accuracy.

Verification

✅ All tests pass locally with:

npm test

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