fix(core): Always re-initialize native SDK from JS in dev builds

[antonis]

📢 Type of change

• Bugfix

📜 Description

When sentry.options.json exists (generated by the Expo config plugin with useNativeInit: true and options), the Metro serializer injects __SENTRY_OPTIONS__ into the JS bundle. The SDK then sets autoInitializeNativeSdk = false, skipping the JS-side initNativeSdk call entirely.

This prevents the native log bridge (rnLogger.setReactContext) and runtime values (devServerUrl, defaultSidecarUrl, mobileReplayOptions) from being configured, resulting in zero envelopes being sent to sentry.io in development builds.

The fix adds a !__DEV__ guard so that:

• Dev builds: JS always calls initNativeSdk, which re-initializes native (the native SDK handles this gracefully: "Sentry has been already initialized. Previous configuration will be overwritten."). The log bridge and runtime values are properly set up.
• Release builds: Behavior is preserved — autoInitializeNativeSdk = false keeps the native-only init for app start crash capture.

💡 Motivation and Context

Closes #5734

Reproduction: With sentry.options.json in the project root, the Expo sample sends zero envelopes to sentry.io (events only appear in Spotlight). Without the file, everything works — JS re-initializes native and envelopes are sent successfully.

The root cause: when autoInitializeNativeSdk = false, the JS wrapper's initNativeSdk returns early at line 250-257 without ever calling RNSentry.initNativeSdk(). The native module never receives the JS options, the React context isn't set on the logger, and captureEnvelope calls from JS don't result in envelopes being delivered.

💚 How did you test it?

1. Unit tests: Added tests for both __DEV__=true and __DEV__=false modes, verifying autoInitializeNativeSdk is set correctly in each case
2. On-device verification (Android emulator):
   • Created sentry.options.json in the Expo sample project root
   • Before fix: didCallNativeInit: false, zero Envelope sent successfully in logs
   • After fix: didCallNativeInit: true, multiple Envelope sent successfully. in logs
3. All 1172 existing tests pass, build and lint clean

📝 Checklist

• I added tests to verify changes
• No new PII added or SDK only sends newly added PII if sendDefaultPII is enabled
• I updated the docs if needed.
• I updated the wizard if needed.
• All tests passing
• No breaking changes

🔮 Next steps

#skip-changelog since this only affects the development workflow

[github-actions]

Semver Impact of This PR

⚪ None (no version bump detected)

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Generated by 🚫 dangerJS against 0b65f55

[lucas-zimerman]

Tested locally, all working!.
LGTM!