Pascals Triangle Explorer: improvement

[anishnath]

Tool: Pascals Triangle Explorer
URL:

Proposal

Improve input validation for edge cases (negatives, NaN). (https://8gwifi.org/pascals-triangle-explorer.jsp)

Why

Enhances accuracy and usability for math learners and practitioners.

Acceptance Criteria

• Clear handling of edge cases covered in tests/docs
• Example inputs/outputs included in the page
• Mobile/desktop layout verified
• Accessibility (labels/aria) checked