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/BottomSheetModule.swift

@@ -42,6 +42,10 @@ public class BottomSheetModule: Module {
       Prop("preventExpansion") { (view: SheetView, prop: Bool) in
         view.preventExpansion = prop
       }
+
+      Prop("sourceViewTag") { (view: SheetView, prop: Int?) in
+        view.sourceViewTag = prop
+      }
     }
   }
 }

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
 

modules/bottom-sheet/src/BottomSheet.types.ts

@@ -1,5 +1,5 @@
-import React from 'react'
-import {ColorValue, NativeSyntheticEvent} from 'react-native'
+import {type ColorValue, type NativeSyntheticEvent} from 'react-native'
+import type React from 'react'
 
 export type BottomSheetState = 'closed' | 'closing' | 'open' | 'opening'
 
@@ -25,6 +25,7 @@ export interface BottomSheetViewProps {
   backgroundColor?: ColorValue
   containerBackgroundColor?: ColorValue
   disableDrag?: boolean
+  sourceViewTag?: number
 
   minHeight?: number
   maxHeight?: number