test: add milestone validation tests for 100% coverage

[jordanpartridge]

Summary

Add tests for uncovered milestone validation paths to achieve 100% code coverage.

Changes

Added tests in ValidatesInputTest.php for:

• Non-string state parameter (line 249)
• Non-string due_on parameter (line 266)
• Empty string due_on parameter (line 272)

Coverage: 99.5% → 100%

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📥 Commits

Reviewing files that changed from the base of the PR and between 6dea130 and 571d95b.

📒 Files selected for processing (1)

• tests/Unit/Traits/ValidatesInputTest.php (2 hunks)

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/milestone-validation-coverage

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