fix: [SDK-5158] serialize grouped notifications on Android

[fadi-george]

Description

One Line Summary

Serialize Android groupedNotifications as structured notification objects instead of string values.

Details

Motivation

Notification click payloads passed the native List<INotification> directly through the Capacitor bridge, causing grouped notifications to be stringified. This recursively serializes each grouped notification, matching the React Native SDK behavior.

Scope

Affects Android notification serialization for click and foreground notification events. No public API changes.

Testing

Unit testing

No native serializer test was added because this repository does not currently have Android bridge unit-test coverage.

Manual testing

• Add console.log('Event:', e); to handleNotificationClick.
• On main, run vp run dev:android and send two grouped notifications.
• Click the grouped notification and observe that groupedNotifications is stringified in the logged notification object.
• Repeat on this PR branch and verify that groupedNotifications is logged as an array of notification objects instead of a string.

Automated validation:

• vp run lint
• vp test run (224 tests passed)
• vp run build

Affected code checklist

• Notifications
  • Display
  • Open
  • Push Processing
  • Confirm Deliveries
• Outcomes
• Sessions
• In-App Messaging
• REST API requests
• Public API changes

Checklist

Overview

• I have filled out all REQUIRED sections above
• PR does one thing
• No public API changes

Testing

• Test coverage status is explained
• All automated tests pass
• Device-testing steps are documented

Final pass

• Code is as readable as possible
• I have reviewed this PR myself

[sherwinski]

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