Fix build compatibility with Xcode 26 on ARM64

Update Swift version from 5.0/5.3 to 5.9 across podspec and Xcode
project settings. Xcode 26 removed the swiftCompatibility56 and
swiftCompatibilityPacks libraries that were required by older Swift
versions, causing linker failures. Swift 5.9 does not depend on
these compatibility libraries.

Also adds ALWAYS_EMBED_SWIFT_STANDARD_LIBRARIES = $(inherited) to
the pod target xcconfig and declares s.swift_version in the podspec
for proper CocoaPods Swift version resolution.

Fixes #778

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: franco-zalamena-iterable

Iterable-React-Native-SDK.podspec

@@ -16,16 +16,19 @@ Pod::Spec.new do |s|
   s.source_files = "ios/**/*.{h,m,mm,cpp,swift}"
   s.private_header_files = "ios/**/*.h"
 
+  s.swift_version = '5.9'
+
   # Load Iterables iOS SDK as a dependency
   s.dependency "Iterable-iOS-SDK", "6.6.7"
 
   # Basic Swift support
   s.pod_target_xcconfig = {
     'DEFINES_MODULE'      => 'YES',
     'CLANG_ENABLE_MODULES' => 'YES',
-    'SWIFT_VERSION'       => '5.3',
+    'SWIFT_VERSION'       => '5.9',
     'SWIFT_OBJC_INTERFACE_HEADER_NAME' => 'Iterable_React_Native_SDK-Swift.h',
     "CLANG_CXX_LANGUAGE_STANDARD" => rct_cxx_language_standard(),
+    'ALWAYS_EMBED_SWIFT_STANDARD_LIBRARIES' => '$(inherited)',
   }
 
   install_modules_dependencies(s)

ios/RNIterableAPI.xcodeproj/project.pbxproj

@@ -264,7 +264,7 @@
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SKIP_INSTALL = YES;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
-				SWIFT_VERSION = 5.0;
+				SWIFT_VERSION = 5.9;
 				TARGETED_DEVICE_FAMILY = "1,2";
 			};
 			name = Debug;
@@ -283,7 +283,7 @@
 				OTHER_LDFLAGS = "-ObjC";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SKIP_INSTALL = YES;
-				SWIFT_VERSION = 5.0;
+				SWIFT_VERSION = 5.9;
 				TARGETED_DEVICE_FAMILY = "1,2";
 			};
 			name = Release;