Refactor build_leadearboard_df function to integrate data conversion from Small Shlepa format to DeathMath; enhance error handling and logging for model data processing

Refactor build_demo function to enhance the DeathMath leaderboard interface; update labels to Russian, improve layout, and add visualization options for model comparisons

Enhance download_openbench and build_leadearboard_df functions with improved error handling and logging; standardize model data processing and add fallback example models

Refactor file submission logic and enhance error handling in submit_file function; update leaderboard and README generation

Add hf_oauth configuration to README.md

Add icons variable for model types in about.py

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