User messages in subagent JSONLs lack the isMeta field, defaulting to false.
An unconditional `continue` in the !isMeta branch skipped tool result
collection for these messages, causing all subagent tools to show
"No result received". Now we check for tool_result blocks before continuing,
allowing them to fall through to the result collection logic.
- 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.
