MapViewAnnotation positions not updated after device rotation in non-full-screen iPad window

Nobody has claimed this yet.

## Environment

- Mapbox Maps SDK: 11.18.2
- Xcode: 26.3
- iOS: 26.4
- Device: iPad 11 Pro (physical)
- SwiftUI

## Observed behavior and steps to reproduce

When using MapViewAnnotation in a SwiftUI Map, annotation positions become incorrect after device rotation when the app window is not full-screen (Split View, Slide Over, or Stage Manager resized window).

The annotations remain at their pre-rotation screen positions instead of being recalculated for the new map projection.

## Expected behavior

Annotations should reposition to match their geographic coordinates in the new map projection, just like PolylineAnnotation and other layer-based annotations do.

## Notes / preliminary analysis

- Full-screen window + rotation: annotations briefly shift but snap back correctly
- Non-full-screen window + rotation: annotations shift and stay wrong
- Dragging the system window resize handle immediately fixes the positions (annotations snap to correct locations)

## Additional links and references


Workarounds attempted (none successful):

- proxy.map?.triggerRepaint()
- Camera center nudge and restore
- Zoom nudge and restore
- Viewport reset (.idle then restore)
- .onGeometryChange to detect container size change

Reproduce the issue with MapViewAnnotation in a SwiftUI Map on an iPad using Split View, Slide Over, or a resized Stage Manager window, then rotate the device and compare the annotation positions with layer-based annotations. Start by tracing the MapViewAnnotation geometry and rotation-update path; done means annotations are recalculated and remain aligned with their geographic coordinates without requiring a window resize.

Written by the indexing model from the issue text.