chore: Release 5.2.18

[onesignal-deploy]

Channels: Current

🛠️ Native Dependency Updates

• Update Android SDK from 5.4.2 to 5.6.1
  • fix: custom events now handle null object within the event properties (#2537)

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  • feat: 🎉 introduces Custom Events Support for the Android SDK. To get started with using Custom Events, please contact support@onesignal.com to enable this feature for your app. Please see documentation on Custom Events.
  • feat: IAMs now display when triggers added before first fetch (#2528)
  • fix: end initialization early if device storage is locked (#2520)

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  • feature: Exposing accessors thru suspend (#2502)
  • fix: a rare NPE from PermissionViewModel introduced in 5.4.0 (#2504)
  • fix: NPE in SyncJobService since 5.4 (#2500)
  • fix: Rare User and Subscription creates and updates processing out of order (introduced in 5.4.0) (#2419)
  • fix: Remove throwing "initWithContext was not called or timed out", introduced in 5.4.0 (#2408)
  • Improvement: failure message shows that appID is missing (#2506)
  • improvement: Offloaded work on background threads. (#2394)

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This change is 

[claude]

Code review

No issues found. Checked for bugs and CLAUDE.md compliance.