test(ai-chat): add edge-case tests for assistant ID reconciliation

[threepointone]

Summary

Adds two additional test cases for the assistant ID reconciliation logic introduced in #958:

• "does not reconcile when assistant content differs at the same position" — verifies that content-based matching does not produce false positives when the assistant text is different, even if the message is at the same position in the history.
• "skips tool-bearing assistant messages during reconciliation without breaking cursor" — verifies that tool-call assistant messages are correctly excluded from content-based reconciliation, and that the cursor still advances properly for subsequent plain-text assistant messages.

These were identified during review of #958 but the PR was merged before they could be pushed.

Test plan

• All 6 tests in merge-server-state.test.ts pass
• All 23 tests in client-tool-duplicate-message.test.ts pass (no regressions)
• Full test suite passes (654 agents + 201 ai-chat)

Made with Cursor

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commit: 66347f9