[Frontend] refactor harmony utils output message parsing

[daniel-salib]

Purpose

Refactor parse_output_message() in harmony_utils.py to improve
code organization and maintainability by extracting parsing
logic into focused helper functions.

Changes

Split the monolithic parse_output_message() function into four
specialized helper functions:

• _parse_browser_tool_call() - Handles browser tool calls
  (search, open, find)
• _parse_function_call() - Handles custom function calls
• _parse_reasoning_content() - Handles reasoning/analysis
  content
• _parse_final_message() - Handles final output messages

Testing

• Existing harmony utils tests pass
• No functional changes - pure refactoring

[chatgpt-codex-connector]

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[gemini-code-assist]

Code Review

This pull request refactors the parse_output_message function in harmony_utils.py by extracting logic into several focused helper functions. The changes significantly improve code organization and maintainability. The refactoring is well-done, but I've identified a potential KeyError in the new _parse_browser_tool_call function due to an unsafe dictionary access. I've provided a suggestion to fix this. Apart from that, the changes look good.

[daniel-salib]

thanks for the review @qandrew

@robertgshaw2-redhat @chaunceyjiang @yeqcharlotte

please let me know if you have any feedback or if this good to approve/merge

[chaunceyjiang]

Thanks~