🔒 Fix potential crash by removing forced downcast in AnnotationController

[google-labs-jules]

🎯 What: The vulnerability fixed is the use of a forced downcast (as!) when dequeueing a reusable MKMarkerAnnotationView in AnnotationController.swift.
⚠️ Risk: If MapKit returns an annotation view of an unexpected type or fails to dequeue successfully, the forced downcast will cause the application to crash immediately, leading to a potential Denial of Service (DoS).
🛡️ Solution: The fix replaces as! with a conditional downcast as?. If it returns nil (either because the dequeued view is not of type MKMarkerAnnotationView or the dequeue fails), the fallback safely instantiates a new MKMarkerAnnotationView using ?? MKMarkerAnnotationView(...). This follows Apple's Swift safety best practices and mirrors existing safe handling in the file.

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PR created automatically by Jules for task 6090930831571072816 started by @esenmx

[google-labs-jules]

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