fix: compile fmt as C++17 in iOS demo

Author: bryceknz

examples/demo/ios/Podfile

@@ -31,5 +31,14 @@ target 'Example' do
       :mac_catalyst_enabled => false,
       # :ccache_enabled => true
     )
+
+    installer.pods_project.targets.each do |target|
+      next unless target.name == 'fmt'
+
+      target.build_configurations.each do |build_configuration|
+        # Xcode 26's Clang rejects fmt 11's C++20 consteval format strings.
+        build_configuration.build_settings['CLANG_CXX_LANGUAGE_STANDARD'] = 'c++17'
+      end
+    end
   end
 end

examples/demo/ios/Podfile.lock

@@ -1338,7 +1338,7 @@ PODS:
     - React-jsiexecutor
     - React-RCTFBReactNativeSpec
     - ReactCommon/turbomodule/core
-  - react-native-app-auth (8.0.3):
+  - react-native-app-auth (8.3.0):
     - AppAuth (>= 1.7.6)
     - React-Core
   - React-NativeModulesApple (0.79.2):
@@ -1900,72 +1900,72 @@ SPEC CHECKSUMS:
   fmt: a40bb5bd0294ea969aaaba240a927bd33d878cdd
   glog: 5683914934d5b6e4240e497e0f4a3b42d1854183
   hermes-engine: 314be5250afa5692b57b4dd1705959e1973a8ebe
-  RCT-Folly: 36fe2295e44b10d831836cc0d1daec5f8abcf809
+  RCT-Folly: e78785aa9ba2ed998ea4151e314036f6c49e6d82
   RCTDeprecation: 83ffb90c23ee5cea353bd32008a7bca100908f8c
   RCTRequired: eb7c0aba998009f47a540bec9e9d69a54f68136e
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   React: c2d3aa44c49bb34e4dfd49d3ee92da5ebacc1c1c
   React-callinvoker: 1bdfb7549b5af266d85757193b5069f60659ef9d
-  React-Core: 7150cf9b6a5af063b37003062689f1691e79c020
-  React-CoreModules: 15a85e6665d61678942da6ae485b351f4c699049
-  React-cxxreact: 74f9de59259ac951923f5726aa14f0398f167af9
+  React-Core: 10597593fdbae06f0089881e025a172e51d4a769
+  React-CoreModules: 6907b255529dd46895cf687daa67b24484a612c2
+  React-cxxreact: a9f5b8180d6955bc3f6a3fcd657c4d9b4d95c1f6
   React-debug: e74e76912b91e08d580c481c34881899ccf63da9
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-  React-FabricImage: f14f371d678aa557101def954ac3ba27e48948ff
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   React-featureflags: d5facceff8f8f6de430e0acecf4979a9a0839ba9
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-  React-NativeModulesApple: 452b86b29fae99ed0a4015dca3ad9cd222f88abf
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+  React-NativeModulesApple: 2c4377e139522c3d73f5df582e4f051a838ff25e
   React-oscompat: ef5df1c734f19b8003e149317d041b8ce1f7d29c
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   React-rendererconsistency: 351fdbc5c1fe4da24243d939094a80f0e149c7a1
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   React-rncore: 57ed480649bb678d8bdc386d20fee8bf2b0c307c
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   React-runtimeexecutor: d60846710facedd1edb70c08b738119b3ee2c6c2
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   SocketRocket: d4aabe649be1e368d1318fdf28a022d714d65748
   Yoga: c758bfb934100bb4bf9cbaccb52557cee35e8bdf
 
-PODFILE CHECKSUM: c54684e3f1470fec4ac3575659f327d0c2b216e3
+PODFILE CHECKSUM: 1db384fdd374a87d35937b56f18331e74846937b
 
 COCOAPODS: 1.16.2