fix(ios): resolve ImportReact.h in Expo modular builds

[rokiai]

Summary

• Expo SDK 57 (and other DEFINES_MODULE + modular-header setups) generate react-native-update-umbrella.h under Headers/Public/react_native_update/ (underscores). That umbrella #import "ImportReact.h".
• ImportReact.h was marked public_header_files but not source_files, so CocoaPods never copied it into Headers/Public. Combined with the hyphenated public-header dir (react-native-update/) missing from USER_HEADER_SEARCH_PATHS, iOS compile failed with 'ImportReact.h' file not found.
• Add ios/ImportReact.h to source_files in the Expo branch, and put $(PODS_ROOT)/Headers/Public/react-native-update on the search path (PODS_ROOT, not a machine-specific source path).

Test plan

• Expo SDK 57 / RN 0.86 project with use_expo_modules! and modular headers: pod install, then compile the iOS target. The umbrella should find ImportReact.h.
• Confirm ios/Pods/Headers/Public/react-native-update/ImportReact.h exists after pod install.
• Non-Expo / RN CLI project still pods and builds (Expo source_files branch is gated on use_expo_modules!).
• Search paths stay $(PODS_ROOT)/... only — no absolute checkout path in the generated xcconfig.

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Summary by CodeRabbit

• Bug Fixes
  • Improved iOS integration for CocoaPods by enabling umbrella-header imports from the public-header location.
  • Ensured valid Expo projects include the required iOS import source file.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Advanced

Run ID: cf7aa018-4242-40d3-ba75-b1116b60764e

📥 Commits

Reviewing files that changed from the base of the PR and between 583801a and 7861f35.

📒 Files selected for processing (1)

• react-native-update.podspec

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📝 Walkthrough

Walkthrough

The podspec adds the public-header search path and includes ios/ImportReact.h in the Expo-specific source files.

Changes

CocoaPods header integration

Layer / File(s)	Summary
Podspec header declarations react-native-update.podspec	The podspec adds the hyphenated public-header search path and declares ios/ImportReact.h as an Expo-specific source file.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~5 minutes

Change: Bug fix

Suggested reviewers: sunnylqm

Merge Risk: ⚪ Minimal · up to 3ac5b

The narrowly scoped Expo podspec updates introduce no identified merge-blocking behavior or production risk.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly identifies the iOS Expo modular-build fix and matches the main changes to ImportReact.h resolution and CocoaPods configuration.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

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• Create PR with unit tests

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