- Migrated internal streaming state from string-based properties to symbol-keyed properties for improved data isolation and safety.
- Replaced the deprecated `stripVariant` utility with centralized `clearStreamingPartialJson` and symbol-specific helper methods across all provider implementations.
- Implemented `stripStreamingBlockSymbols` and updated deep equality checks to ensure metadata does not interfere with content comparisons.
- Standardized streaming metadata access through a new `block-symbols` utility module.
- Synchronize tool arguments with the component state upon receipt of `tool_execution_start` to ensure visual consistency when final update events are missed.
- Terminate active argument reveal streams to prevent late ticks from overwriting valid, fully-materialized tool arguments with stale partial data.
- Add test coverage to verify that tool UI components render finalized arguments even in the absence of intermediate streaming updates.
- Added a SessionFocusController to switch transcript and input context between main and subagent sessions.
- Added agent-hub Enter activation and double-left return behavior for focused local agents.
- Added view-session-based event and render logic to avoid stale focus-session state.
- Added status-line focused agent display with ghost icon and focused-mode border dimming.
Reorders sections in the streaming call preview to match `renderResult` and the
schema's field order. This prevents visual jumps when the preview transitions
to a result and ensures append-only growth of streamed content.
Additionally, omits the agent-list divider when no agent rows are present.
- Added smooth streaming reveal of streamed tool-call args and `{ input }` partial previews.
- Integrated ToolArgsRevealController in EventController to route partial and final args.
- Implemented UTF-16-safe slicing to prevent surrogate-pair splits during reveal boundaries.
- Implemented reveal lifecycle controls to flush or stop streamed arg frames at message boundaries.
- Added tests for monotonic reveal progression, non-smooth immediate output, and flush/stop behavior.
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