fix: resolve 4 bugs in Clinical-Insight-Engine

[saurabhhhcodes]

Description

This PR fixes real bugs found in the codebase:

• Fixed default sort: .sort() coerces elements to strings, so [10, 9, 2] sorts as [10, 2, 9]; numeric comparator sorts correctly.
• Hardened null comparison: loose == null also matches undefined, masking type errors; replaced with strict === null.
• Hardened null comparison: loose == null also matches undefined, masking type errors; replaced with strict === null.
• Fixed default sort: .sort() coerces elements to strings, so [10, 9, 2] sorts as [10, 2, 9]; numeric comparator sorts correctly.

Type of Change

• Bug fix (non-breaking change fixing an issue)

How Has This Been Tested?

• Local manual testing

Checklist

• My code follows the style guidelines
• I have performed a self-review

Related Issue

Ref: #2465

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