fix: expo plugin sodium not working on SDK 55+

Expo SDK 55 removed ENV['RCT_NEW_ARCH_ENABLED'] from the Podfile
template since New Architecture is now mandatory (RN 0.83+). The
withSodiumIos plugin was using that line as a regex anchor to insert
ENV['SODIUM_ENABLED'], so the replacement silently matched nothing.

Instead of anchoring to any specific Podfile line, prepend the ENV
assignment to the top of the file. This works regardless of Podfile
template changes across Expo SDK versions.

Fixes #957

Author: boorad

packages/react-native-quick-crypto/src/expo-plugin/withSodiumIos.ts

@@ -14,13 +14,8 @@ export const withSodiumIos: ConfigPlugin<ConfigProps> = config => {
       );
       let contents = fs.readFileSync(podfilePath, 'utf-8');
 
-      // Check if SODIUM_ENABLED is already set
       if (!contents.includes("ENV['SODIUM_ENABLED']")) {
-        // Add it right after the RCT_NEW_ARCH_ENABLED ENV variable
-        contents = contents.replace(
-          /^(ENV\['RCT_NEW_ARCH_ENABLED'\].*$)/m,
-          `$1\nENV['SODIUM_ENABLED'] = '1'`,
-        );
+        contents = `ENV['SODIUM_ENABLED'] = '1'\n${contents}`;
         fs.writeFileSync(podfilePath, contents);
       }