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fix(web): filter duplicate input message in sub-agent blocks (#135)

When the SDK invokes a Task tool (sub-agent), it creates an initial user
message containing the prompt text. This was being shown twice:
1. In the "Input" section via input.prompt
2. As the first message in the "Messages" section

Added a useMemo filter that removes the first user message if its content
exactly matches the input prompt, preventing the duplicate display.

Also documented that thinking blocks in sub-agents are an SDK limitation -
the AgentDefinition type doesn't support thinking configuration.

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

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