ci(macos): fix macos test runner

[russellwheatley]

Description

• backported the React Native fmt update from 11.0.2 to 12.1.0 into the react-native-macos podspec patch so Xcode 26.4 can compile the macOS test app again.
• updated the macOS test app target to disable Xcode’s Debug dylib layout and corrected the Info.plist path casing, so Jet can launch the built .app normally in CI.

Reference for the dependency bump: facebook/react-native#56099

Related issues

Release Summary

Checklist

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
  • Yes
• My change supports the following platforms;
  • Android
  • iOS
  • Other (macOS, web)
• My change includes tests;
  • e2e tests added or updated in packages/\*\*/e2e
  • jest tests added or updated in packages/\*\*/__tests__
• I have updated TypeScript types that are affected by my change.
• This is a breaking change;
  • Yes
  • No

Test Plan

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Project	Deployment	Actions	Updated (UTC)
react-native-firebase	Error		Mar 31, 2026 2:49pm

[mikehardy]

Nice - looks high-precision and accurate, +1 if CI goes green

[gemini-code-assist]

Code Review

This pull request updates the fmt library version from 11.0.2 to 12.1.0 across the project, including updates to Podfile.lock and a patch for react-native-macos podspecs. Additionally, it modifies the macOS project configuration to disable ENABLE_DEBUG_DYLIB and corrects the casing of the INFOPLIST_FILE path. I have no feedback to provide.