[fadi-george]

Description

One Line Summary

Adds HTML, Full Bleed, Carousel, and Carousel Bleed IAM buttons to the demo app and lays out all 8 in a 2-column grid.

Details

Motivation

Lets us test the extra IAM layouts from the demo app. Follows the shared spec update in OneSignal/sdk-shared#66 and matches iOS (OneSignal/OneSignal-iOS-SDK#1787).

Scope

• Labels are now Top, Bottom, Center, HTML, Full, Full Bleed, Carousel, Carousel Bleed (uppercased). Existing iam_type values and test IDs (send_iam_{type}_button) are unchanged.
• InAppMessageType: 4 new members in grid order.
• SendIamSection: 2-column grid with columnGap: AppSpacing.gap. Row gap comes from the button's existing bottom margin.
• ActionButton: optional singleLine prop (one line, adjustsFontSizeToFit, 8px side padding). Other buttons are unchanged.
• Demo app only. No plugin changes.

Testing

Manual testing

Ran vp check and vp test. Checked the grid with a release build on an Android 16 emulator.

Checklist

Overview

• I have filled out all REQUIRED sections above
• PR does one thing
• Any Public API changes are explained in the PR details and conform to existing APIs

Testing

• I have personally tested this on my device, or explained why that is not possible
• I have tested this on the latest version of the plugin
• I have tested this on both Android and iOS, or explained why that is not possible (Android emulator only; demo UI change is cross-platform JS)

Final pass

• Code is as readable as possible.
• I have reviewed this PR myself, ensuring it meets each checklist item

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