Refine typehints in special/llm.py
          #1387
        
          
      
                
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Description
Optionalcan be replaced by| Nonein modern PythonsTuplecan be replaced by lowercasetuplein modern Pythonscurhas a type ofpymysql.cursors.Cursorredirectint(e.code or 0), a semantic changebuild_command_tree()using an inner_build_command_tree()to simplify the return typeCOMMAND_TREEas an argument defaultreturnstatementChecklist
changelog.md.AUTHORSfile (or it's already there).uv run ruff check && uv run ruff format && uv run mypy --install-types .to lint and format the code.