Add centralized logging mechanism that simultaneously outputs to console
and GUI log components, improving code maintainability and consistency.
Changes:
- Add gui/log_config.py for centralized logging configuration
- Add gui/widgets/log_handler.py as bridge between logging and LogText
- Integrate unified logging into DataExtractionTab and MaterialValidationTab
- Initialize logging system in MainWindow on startup
- Improve error messages in material_status_validator for empty results
- Add documentation for logging mechanism and refactoring
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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