fix(ios): resolve Xcode 26 build failures with fmt consteval and icon…

apps/expo-multi-tv/app.json

@@ -47,7 +47,8 @@
             "useExoplayerDash": false
           }
         }
-      ]
+      ],
+      "./plugins/withFmtXcode26Fix"
     ],
     "name": "MultiTVSample",
     "slug": "MultiTVSample",

apps/expo-multi-tv/plugins/withFmtXcode26Fix.js

@@ -0,0 +1,40 @@
+const { withDangerousMod } = require("expo/config-plugins");
+const fs = require("fs");
+const path = require("path");
+
+function withFmtXcode26Fix(config) {
+  return withDangerousMod(config, [
+    "ios",
+    (config) => {
+      const podfilePath = path.join(
+        config.modRequest.platformProjectRoot,
+        "Podfile"
+      );
+      let podfile = fs.readFileSync(podfilePath, "utf8");
+
+      if (podfile.includes("CLANG_CXX_LANGUAGE_STANDARD") && podfile.includes("fmt")) {
+        return config;
+      }
+
+      const fmtFix = `
+    # Fix fmt consteval errors on Xcode 26+ by compiling fmt with C++17
+    installer.pods_project.targets.each do |target|
+      if target.name == 'fmt'
+        target.build_configurations.each do |bc|
+          bc.build_settings['CLANG_CXX_LANGUAGE_STANDARD'] = 'c++17'
+        end
+      end
+    end`;
+
+      podfile = podfile.replace(
+        /post_install do \|installer\|/,
+        `post_install do |installer|${fmtFix}`
+      );
+
+      fs.writeFileSync(podfilePath, podfile, "utf8");
+      return config;
+    },
+  ]);
+}
+
+module.exports = withFmtXcode26Fix;