Add ESC key handler to cancel streaming messages #510
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Wire ESC key handling to cancel ongoing LLM requests during streaming. Creates a keyboard listener that runs concurrently with the streaming task and cancels it when ESC is pressed. Uses the existing asyncio Task.cancel() mechanism that LLM providers already handle.
- Rewrite keyboard listener to use thread-based approach that works with Rich's Live display (cbreak mode instead of raw mode) - Add CANCELLED case to LlmStopReason handler in llm_agent.py to display friendly message instead of "unhandled reason" error - Progress display cleanup is already handled via _shutdown_live_resources
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Wire ESC key handling to cancel ongoing LLM requests during streaming. Creates a keyboard listener that runs concurrently with the streaming task and cancels it when ESC is pressed. Uses the existing asyncio Task.cancel() mechanism that LLM providers already handle.