fix: use single sheet for password coordination

Author: russellwheatley

FirebaseSwiftUI/FirebaseAuthSwiftUI/Sources/Views/AuthPickerView.swift

@@ -35,6 +35,7 @@ public struct AuthPickerView<Content: View> {
 extension AuthPickerView: View {
   public var body: some View {
     @Bindable var authService = authService
+    @Bindable var passwordPrompt = authService.passwordPrompt
     content()
       .sheet(isPresented: $authService.isPresented) {
         @Bindable var navigator = authService.navigator
@@ -77,6 +78,10 @@ extension AuthPickerView: View {
         )
         .interactiveDismissDisabled(authService.configuration.interactiveDismissEnabled)
       }
+      // Centralized password prompt sheet to prevent conflicts
+      .sheet(isPresented: $passwordPrompt.isPromptingPassword) {
+        PasswordPromptSheet(coordinator: authService.passwordPrompt)
+      }
       // View-layer logic: Handle account conflicts (auto-handle anonymous upgrade, store others for
       // linking)
       .onChange(of: authService.currentAccountConflict) { _, conflict in

FirebaseSwiftUI/FirebaseAuthSwiftUI/Sources/Views/MFAManagementView.swift

@@ -55,7 +55,6 @@ public struct MFAManagementView {
 
 extension MFAManagementView: View {
   public var body: some View {
-    @Bindable var passwordPrompt = authService.passwordPrompt
     VStack(spacing: 20) {
       // Title section
       VStack {
@@ -133,10 +132,7 @@ extension MFAManagementView: View {
     .onAppear {
       loadEnrolledFactors()
     }
-    // Present password prompt when required for reauthentication
-    .sheet(isPresented: $passwordPrompt.isPromptingPassword) {
-      PasswordPromptSheet(coordinator: authService.passwordPrompt)
-    }
+    // Password prompt sheet now centralized in AuthPickerView
   }
 
   @ViewBuilder

FirebaseSwiftUI/FirebaseAuthSwiftUI/Sources/Views/SignedInView.swift

@@ -38,7 +38,6 @@ public struct SignedInView {
 
 extension SignedInView: View {
   public var body: some View {
-    @Bindable var passwordPrompt = authService.passwordPrompt
     VStack {
       Text(authService.string.signedInTitle)
         .font(.largeTitle)
@@ -144,9 +143,7 @@ extension SignedInView: View {
       )
       .presentationDetents([.medium])
     }
-    .sheet(isPresented: $passwordPrompt.isPromptingPassword) {
-      PasswordPromptSheet(coordinator: authService.passwordPrompt)
-    }
+    // Password prompt sheet now centralized in AuthPickerView
     .sheet(isPresented: $showEmailVerificationSent) {
       VStack(spacing: 24) {
         Text(authService.string.verifyEmailSheetMessage)