fix: show the correct number of pending tools

[uinstinct]

Description

For pending tools, the count of tools not yet completed. This PR fixes that.

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• [] I've read the contributing guide
• [] The relevant docs, if any, have been updated or created
• [] The relevant tests, if any, have been updated or created

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before.mp4

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Tests

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Summary by cubic

Fixes the pending tools count in ToolCallDiv so the grouped header shows the number of tools not yet completed. Uses a new pendingCalls list (status !== "done") and passes it to GroupedToolCallHeader, falling back to activeCalls when none are pending.

^{Written for commit 3d7be8a. Summary will update automatically on new commits.}

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Reviewed the changes - no documentation updates needed. This is a UI bug fix that corrects the pending tool count display in the grouped tool call header. The change is internal to the GUI component and doesn't affect any documented user-facing features, APIs, or configuration options.

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