`handleShakeCommand` calls `rebuildChatFromMessages()`, which clears
`chatContainer` and replays only committed `state.messages`. The agent's
in-flight `streamMessage` and its still-pending tool calls live OUTSIDE
`state.messages` until `message_end`, so the live `streamingComponent`
and `pendingTools` entries were detached while their references stayed
live — every subsequent `message_update`/`message_end` event then
updated orphaned components that never re-rendered, and the in-flight
LLM output disappeared from the chat. Other mid-stream rebuild paths
(setting toggles such as `display.cacheMissMarker` and
`tui.renderMermaid`) had the same flaw.
Snapshot the live `streamingComponent` and `pendingTools` (in their
original chat-container order) before clear, re-append after the
historical replay, and restore the `pendingTools` map so the next
streamed tool-call delta routes back into the preserved component
instead of stacking a duplicate ToolExecutionComponent below it. Idle
rebuilds are unchanged.
Fixes#3656
can1357