Add PHP type hints and fix null concatenation bug in setUserAgent

[Copilot]

• Investigate test failures mentioned by @JayBizzle
• Identify root cause: PHP 7.4+ typed properties used in PHP 7.3 environment
• Fix PHP 7.3 compatibility issue in UserAgentTest.php
• Run tests to verify fix - all 15 tests passing
• Reply to @JayBizzle's comment

Original prompt

Review the code and make whatever improvements you see fit

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[JayBizzle]

@copilot Tests are failing

[Copilot]

@copilot Tests are failing

Fixed in bc48b05. The issue was a PHP 7.4+ typed property (private ?CrawlerDetect $CrawlerDetect) in the test file that's incompatible with PHP 7.3. Changed to use PHPDoc type hints instead while maintaining type information.

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