Wrap SessionItem, SubagentItem, ExecutionTrace, TextItem, ThinkingItem,
and DisplayItemList in React.memo. These components render repeatedly in
virtualized lists and AI chat groups — memoizing them eliminates redundant
renders when their props have not changed, reducing CPU work in active
sessions with many messages or long session sidebars.
- Introduced a new function to determine the current review state based on task history events, improving the accuracy of review status tracking.
- Updated the requestReview, approveReview, and requestChanges functions to append corresponding review events to the task history, ensuring comprehensive tracking of review actions.
- Refactored task management logic to utilize the new historyEvents structure, replacing the previous statusHistory implementation for better clarity and maintainability.
- Enhanced tests to validate the new review event handling and ensure correct behavior across various task states.
- Added support for rendering 'subagent_input' and 'compact_boundary' types in the chat display components.
- Introduced a new `MarkdownViewer` for displaying content in both item types.
- Enhanced the `MetricsPill` and `SubagentItem` components to include phase breakdowns and isolated usage metrics.
- Updated the `AIGroupDisplayItem` type to accommodate new item types and their properties.
- Implemented logic to compute and display token consumption across multiple phases for subagents.
