fix: code quality and safety improvements

[saurabhhhcodes]

Summary by CodeRabbit

• Bug Fixes
  • Improved numeric input validation across calculator examples and UI controls.
  • Prevented non-numeric values from being misinterpreted during number entry, pagination, and selection prompts.
  • Preserved existing clamping and validation behavior for valid inputs.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 6de3817e-1d5b-4a80-889b-4abe0ae52d79

📥 Commits

Reviewing files that changed from the base of the PR and between 6c7584e and 3bd8c6b.

📒 Files selected for processing (4)

• examples/calculator/src/index.tsx
• packages/ui/src/NumberInput.ts
• packages/ui/src/Pagination.ts
• packages/ui/src/prompts.ts

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📝 Walkthrough

Walkthrough

The change replaces global isNaN checks with strict Number.isNaN checks in the calculator and UI input validation paths. Existing clamping and fallback behavior remains unchanged.

Changes

NaN Validation

Layer / File(s)	Summary
Calculator validation examples/calculator/src/index.tsx	Negative-number detection and final-result validation now use Number.isNaN.
UI input validation packages/ui/src/NumberInput.ts, packages/ui/src/Pagination.ts, packages/ui/src/prompts.ts	Parsed input checks now use Number.isNaN. Existing clamping, infinity handling, and fallback behavior remain unchanged.

Estimated code review effort: 2 (Simple) | ~10 minutes

Suggested labels: quality:clean

Suggested reviewers: karanjot786, tomeshwari-02

🚥 Pre-merge checks | ✅ 3 | ❌ 2

❌ Failed checks (2 warnings)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	No pull request description was provided, so the required sections, issue link, package scope, change type, and checklist are missing.	Add a description that completes the required template, including the linked issue, affected packages, change type, checklist, and reviewer notes.
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title describes the code-quality and safety focus of the changes, although it does not identify the Number.isNaN validation updates.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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