Add iOS 26 fluid zoom transition for Menu sheets

On iOS 26+, Menu bottom sheets now morph from their trigger button
using UIViewController.preferredTransition = .zoom. This creates a
fluid visual connection between the trigger and the presented sheet,
complementing the Liquid Glass design language.

The sourceViewTag prop is also available on the generic Dialog/BottomSheet
layer so any dialog can opt into the zoom transition.

https://claude.ai/code/session_011cNDhEb2cDgg5QbVuzEyH1

modules/bottom-sheet/ios/SheetView.swift

@@ -26,6 +26,7 @@ class SheetView: ExpoView, UISheetPresentationControllerDelegate {
   var preventDismiss = false
   var preventExpansion = false
   var cornerRadius: CGFloat?
+  var sourceViewTag: Int?
   var minHeight = 0.0
   var maxHeight: CGFloat! {
     didSet {
@@ -135,6 +136,15 @@ class SheetView: ExpoView, UISheetPresentationControllerDelegate {
     }
     sheetVc.view.addSubview(innerView)
 
+    if #available(iOS 26.0, *),
+       let tag = self.sourceViewTag,
+       let bridge = self.appContext?.reactBridge,
+       let sourceView = bridge.uiManager.view(forReactTag: NSNumber(value: tag)) {
+      sheetVc.preferredTransition = .zoom { _ in
+        return sourceView
+      }
+    }
+
     self.sheetVc = sheetVc
     self.isOpening = true