feat(receive): add adaptive receive flow and document opening

iosApp/iosApp/iOSApp.swift

@@ -1,10 +1,13 @@
+import Shared
 import SwiftUI
 
 @main
 struct iOSApp: App {
+    private let externalInvitations = ExternalInvitationController()
+
     var body: some Scene {
         WindowGroup {
-            ContentView()
+            ContentView(externalInvitations: externalInvitations)
         }
     }
 }