fix: improve JSON parsing robustness in get_next_action

[ManojINaik]

Enhanced JSON parsing with:

• Better code block extraction
• Fallback to raw JSON object detection
• Improved error handling with detailed logging
• Graceful fallback response on parse failure

[warmshao]

Great! Can you provide specific examples that demonstrate the improved robustness of this parsing approach? Have you encountered any instances during testing where the previous method failed and this new implementation succeeded?

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