Keep user-opened tools expanded across streaming updates - #743
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Lift expanded state from ToolCallBlock's local useState to a chat-level Set keyed by toolCallId (fallback to entry/stream index). The local state was tied to the component instance and reset on every streaming delta and when a streamed tool was promoted to history via loadSession, causing an open tool to collapse on each new LLM line. A session-scoped map in ChatWindow now survives re-renders and the stream → history transition, and is cleared on session change.
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Currently user can open tools/thinking blocks, but when a new streaming event comes in, the blocks are closed.
This PR keeps them open.