Clarify SwiftUI annotation dragging limitations (#5334)

- Remove isDraggable parameter from SwiftUI CircleAnnotation example
- Add documentation note explaining dragging is not supported in SwiftUI
- Update SwiftUI User Guide to clarify isDraggable and isSelected
limitations

🤖 Generated with [Claude Code](https://claude.ai/code)

cc @mapbox/maps-ios

Co-authored-by: Release SDK bot for Maps SDK team <[email protected]>
Co-authored-by: Claude <[email protected]>
GitOrigin-RevId: 501a73b9e9b7c33f1848a3febea9e095f718f351

Author: 3 people

Sources/Examples/SwiftUI Examples/AnnotationsExample.swift

@@ -38,7 +38,7 @@ struct AnnotationsExample: View {
             Map(viewport: $viewport) {
                 ForEvery(Self.flights, id: \.name) { flight in
                     CircleAnnotationGroup(flight.airports, id: \.name) { airport in
-                        CircleAnnotation(centerCoordinate: airport.coordinate, isDraggable: true)
+                        CircleAnnotation(centerCoordinate: airport.coordinate)
                             .circleColor(StyleColor(flight.color))
                             .onTapGesture { alert = "Airport: \(airport.name)" }
                     }

Sources/MapboxMaps/Documentation.docc/Articles/SwiftUI User Guide.md

@@ -256,6 +256,8 @@ MapViewAnnotation(coordinate: CLLocationCoordinate(...))
 
 Layer annotations are rendered natively in the map using layers. They can be placed in between map layers, support clustering (for ``PointAnnotation``s only) and are usually more performant.
 
+> Note: SwiftUI layer annotations do not support dragging functionality. The `isDraggable` and `isSelected` properties available in UIKit are not supported in SwiftUI.
+
 The example below displays different types of layer annotations.
 
 ```swift