fix(string): 🐛 constrain titleCase property test to non-whitespace words

[baxyz]

Description

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Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update
• Refactoring
• Test improvement

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• All new and existing tests passed locally
• My commits follow the conventional commit format

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[Copilot]

Pull request overview

Adjusts the titleCase property-based test generator to avoid invalid “word” inputs that can lead to misleading failures, improving test reliability for multi-word behavior.

Changes:

• Constrains generated words in the multi-word property test to exclude whitespace-only strings.
• Refactors the property declaration formatting for readability.

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[github-actions]

✅ PR Validation Passed

All checks passed and coverage target reached!

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📋 Pipeline Status

	Job	Status
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✅	📝 Lint	passing
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📊 Code Coverage

✅ Overall Coverage: 100.0% — Target reached! 🎯

	Metric	Progress	Coverage
✅	Lines	▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓	100%
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✅	Statements	▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓	100%

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🧬 Mutation Testing

🟢 Mutation Score: 92.39% — excellent

	Metric	Progress	Score
🟢	Mutation Score	▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓░░	92.39%

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🌐 Runtime Compatibility

✅ Runtime Compatibility: 3/3 — All runtimes passed!

	Runtime	Status
🟩	Node.js 24 (LTS) v24.14.1	✅
🦕	Deno 2.7.13	✅
🍞	Bun 1.3.13	✅

🔄 Runtime compatibility is informational only and does not block the PR

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⏱️ Benchmarks

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ℹ️ About this report

• 🎯 Coverage Target: 100% for all metrics
• 🧬 Mutation Testing: powered by Stryker (non-blocking)
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• 📈 Coverage is measured using Vitest + v8

_{🤖 Generated by @helpers4 CI • 2026-04-25}