Fix Swift compiler warnings

- ConnectButton: activate the orphaned lessThanOrEqualTo bottom
  constraint so its return value is not ignored.
- SignInWithAppleAuthentication: handle ASAuthorizationError.Code
  cases added after the SDK's iOS 14.2 deployment target behind
  availability checks:
    .notInteractive          -> .notHandled
    .matchedExcludedCredential -> .failed
    .credentialImport        -> .failed
    .credentialExport        -> .failed
  so the switch is exhaustive on current SDKs and each new case
  surfaces the closest meaningful AuthenticationError.

Author: ssathy2

IFTTT SDK/ConnectButton.swift

@@ -345,7 +345,7 @@ public class ConnectButton: UIView {
             footerLabel.constrain.edges(to: footerLabelContainer, edges: [.left, .top, .right])
 
             // But allow it to be shorter than its container
-            footerLabel.bottomAnchor.constraint(lessThanOrEqualTo: footerLabelContainer.bottomAnchor)
+            footerLabel.bottomAnchor.constraint(lessThanOrEqualTo: footerLabelContainer.bottomAnchor).isActive = true
             let breakableBottomConstraint = footerLabel.bottomAnchor.constraint(equalTo: footerLabelContainer.bottomAnchor)
             breakableBottomConstraint.priority = .defaultHigh
 

IFTTT SDK/SignInWithAppleAuthentication.swift

@@ -41,6 +41,32 @@ final class AppleSignInWebService: ServiceAuthentication {
         @available(iOS 13.0, *)
         func authorizationController(controller: ASAuthorizationController, didCompleteWithError error: Error) {
             let authorizationError = ASAuthorizationError(_nsError: error as NSError)
+            // Cases added after the SDK's iOS 14.2 deployment target,
+            // referenced behind availability checks and mapped to the
+            // closest equivalent AuthenticationError:
+            //   - .notInteractive → .notHandled   (the system could not
+            //     present the authorization UI in this context)
+            //   - .matchedExcludedCredential → .failed (request denied
+            //     because the credential is on the exclude list)
+            //   - .credentialImport / .credentialExport → .failed
+            //     (credential transfer operation did not succeed)
+            if #available(iOS 15.4, *), authorizationError.code == .notInteractive {
+                completion(.failure(.notHandled))
+                return
+            }
+            if #available(iOS 18.0, *), authorizationError.code == .matchedExcludedCredential {
+                completion(.failure(.failed))
+                return
+            }
+            if #available(iOS 18.2, *), authorizationError.code == .credentialImport {
+                completion(.failure(.failed))
+                return
+            }
+            if #available(iOS 18.2, *), authorizationError.code == .credentialExport {
+                completion(.failure(.failed))
+                return
+            }
+
             switch authorizationError.code {
             case .canceled:
                 completion(.failure(.userCanceled))