21.0.0-beta.3

Third beta of the 21.0.0 major release. This release reworks on-device AI's retry policy and adds an Embedded Carousel view along with a set of Scene rendering fixes. See the Migration Guide for details.

Changes

• On-device AI: AirshipAI.ModelProtocol's maxAttempts/responseTimeout requirements are replaced by a single retryDecision(usage:error:attempt:) -> RetryDecision, so a model can retry a schema-validation failure differently than a thrown error like a network timeout. AirshipFoundationModel.backed(by:)/.privateCloudCompute(...) take an optional retryDecision override in place of the old parameters; nil keeps the framework default (retry a schema mismatch immediately, back off 1s/4s on any other error, fail after 3 attempts). A custom ModelProtocol conformance needs to adopt the new requirement.
• On-device AI: fixed the evaluation observer reporting an evaluation twice — once as .completed, again as .failed — when decoding the model's response failed after the response had already passed schema validation.
• Embedded views: AirshipEmbeddedViewStyleConfiguration.pending is now ordered by selection preference (most-preferred first), so a custom embedded style no longer has to re-derive ordering itself. Added AirshipEmbeddedCarousel, a carousel container for embedded content, which now honors .ai selection ranking instead of falling back silently.
• Scenes: AirshipPermission gains six cases — .appTrackingTransparency, .camera, .microphone, .bluetooth, .photoLibrary, .contacts — for the Composer's new system-permission action. Only .displayNotifications ships a built-in prompt delegate; the others parse and prompt but resolve to .notDetermined until the app registers its own AirshipPermissionDelegate.
• Scenes: text line height now always uses the scaled-font-size approximation instead of iOS 26's native line-height API, which rendered differently than Android.
• Fixed in-app message banners clipping or oscillating in width on rotation, including under a side notch or camera housing in landscape.
• Fixed AirshipPrivacyManager.enableFeatures/disableFeatures permanently baking a server-side feature disable into local storage instead of leaving it as a read-time subtraction.
• Fixed a crash handling certain native-bridge run-action-cb URLs from web content with fewer or more than three arguments.
• Fixed a regex range mismatch between Swift's String.count and NSString.length that could misparse non-ASCII version-constraint audience matches, device tokens, or URL allow-list patterns.