technologia-jetpack-compose/.artifacts/49c32e64-d97d-4ace-98db-2030a9095b7d/task.artifact.md

• Create ShimmerModifier.kt for animated loading effects
• Add aspectRatio property to MessageUiModel
• Update Message_Messaging.kt to use SubcomposeAsyncImage with shimmer placeholders
• Optimize ChatViewModel prefetching to synchronize with UI image requests
• Add visible parameter to shimmer modifier
• Stabilize click callbacks in MessageMessaging using remember
• Switch from SubcomposeAsyncImage to AsyncImage with background shimmer