[0.84] Fix XCode 26.4 build errors

[leotm]

Target Branch

0.84

Link to commit or PR to be picked

facebook/react-native#56099

Description

Details in

• Xcode 26.4b1/b2/b3/RC • FMT Compile Errors (it needs upgrading) • REPRO **IS** included despite the erroneous label facebook/react-native#55601

Previous pick requests

• [0.83] Fix XCode 26.4 build errors #1259
• [0.81] Fix XCode 26.4 build errors #1261

[github-actions]

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2. ✅ Fixes to bugs in core React Native. Examples:
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   • Metro bundler not starting properly or ignoring the configuration file
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