Fix unsafe URL parsing

[jankovicivana]

Location: UrlDetector.scala:42

AbsoluteUrl.parse() is used inside a .map, which can throw exceptions on invalid URLs. This violates our FP/no-throw guidelines and can cause unexpected crashes:

• Function is not total (can fail unexpectedly)
• Breaks referential transparency
• Uncaught exceptions in .map() will crash the application

To-Do

• Replace any usage of AbsoluteUrl.parse(...) (which can throw exceptions) with a safe alternative
• Add tests for invalid URLs