completed iOS push notification setup: created the NotificationServiceExtension Xcode target programmatically (via xcodeproj), embedded it in Runner, and added its xcconfig base configs; fixed Automatic Signing by switching the NSE↔Runner shared keychain from an app-group to a team-prefixed access group across entitlements, Dart and Swift; fixed the analyzer break from dio 5.9.2 dropping DioExceptionType.transformTimeout

ios/NotificationServiceExtension/NotificationService.swift

@@ -31,7 +31,7 @@ class NotificationService: UNNotificationServiceExtension {
     /// Must exactly match `kPushKeychainGroup` in lib/push/push_secure_storage.dart
     /// and the `keychain-access-groups` entitlement of BOTH the Runner and this
     /// extension. Wrong value here => keychain reads return nil => placeholder.
-    private static let keychainAccessGroup = "group.eu.mhsl.marianum.mobile.client.widget"
+    private static let keychainAccessGroup = "MY55VF3KPG.eu.mhsl.marianum.mobile.client.push"
 
     private static let devicePrivateKeyAccount = "push_device_private_key_pem"
     private static let serverPublicKeyAccount = "push_server_public_key_pem"
@@ -233,7 +233,7 @@ class NotificationService: UNNotificationServiceExtension {
     ///   kSecClass       = kSecClassGenericPassword
     ///   kSecAttrAccount = the Dart key, verbatim
     ///   kSecAttrService = (unset — the Dart IOSOptions set no accountName)
-    ///   kSecAttrAccessGroup = the App Group id
+    ///   kSecAttrAccessGroup = the team-prefixed shared keychain group
     ///   value           = raw UTF-8 bytes of the string
     private func keychainString(_ account: String) -> String? {
         let query: [CFString: Any] = [

ios/NotificationServiceExtension/NotificationServiceExtension.entitlements

@@ -8,7 +8,7 @@
 	</array>
 	<key>keychain-access-groups</key>
 	<array>
-		<string>group.eu.mhsl.marianum.mobile.client.widget</string>
+		<string>$(AppIdentifierPrefix)eu.mhsl.marianum.mobile.client.push</string>
 	</array>
 </dict>
 </plist>