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