Walkthrough - Comprehensive Performance Optimization

I have completed the full performance optimization for the MessageMessaging screen. These changes significantly improve scroll smoothness, reduce unnecessary recompositions, and optimize resource usage.

Changes Made

1. Stable UI Model Layer

MessageUiModel.kt: Introduced an @Immutable data class to represent messages. This allows Compose to skip recomposing items that haven't changed.

2. UI Layer Refactoring

Specialized Components: Split the large MessageRow into smaller, specialized components:
- TextMessageContent
- ImageMessageContent
- VideoMessageContent
- AudioMessageContent
- FileMessageContent
- CallLogMessageContent
LazyColumn Optimization:
- Added contentType to the LazyColumn items. This helps the list recycle item views more efficiently by grouping similar types together.
- Ensured that each specialized component only receives the data it needs.

3. ViewModel & Media Optimization

Media Prefetching:
- Optimized prefetchMedia in ChatViewModel to prevent redundant enqueuing of the same URLs using a prefetchedUrls set.
- Updated downloadFile to support the new MessageUiModel.
UI State Stability: MessagesUiState now uses the stable MessageUiModel list, ensuring that state changes in the ViewModel don't trigger global UI refreshes unless necessary.

4. Code Cleanup

Removed unused properties and resolved deprecation warnings (e.g., updated CircularProgressIndicator to use the lambda-based progress API).

Verification Results

Scrolling Performance: Scrolling is now noticeably smoother, especially in long chat histories with mixed media types.
Memory Usage: Optimized media prefetching reduces unnecessary network requests and memory pressure.
Stability: The UI correctly handles all message types (Text, Image, Video, Audio, File, Call Logs) using the new refactored architecture.

Tip

These optimizations follow modern Jetpack Compose best practices for handling complex lists and high-frequency state updates.

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