feat: Implement GUI for SPED Automático with configuration management and theme support
- Added a new GUI application using the Iced library for user interaction. - Implemented configuration loading from an INI file, including fields for model file, spreadsheet path, and reporting month. - Introduced theme management with options for auto, light, and dark modes based on system preferences. - Added functionality to browse for model and spreadsheet files. - Implemented validation and formatting for the reporting month input. - Integrated asynchronous processing of the SPED generation logic, with user feedback during execution. - Created a logging mechanism to track application events and errors. - Added tests for core functionalities including file reading/writing and data processing.
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