- Introduced `ThemeManager` to handle application themes using `ttkthemes`.
- Added `SettingsWindow` for user preferences including theme selection and UI settings.
- Integrated theme selection into the main application with a menu for quick access.
- Enhanced UI components with custom styles based on the selected theme.
- Implemented tooltips for better user guidance across various UI elements.
- Updated dependencies to include `ttkthemes` for improved visual appeal.
- Implemented ExportWindow class for exporting data and graphs in various formats (JSON, XML, PDF).
- Integrated ExportManager to handle export logic.
- Added export option in the main application menu.
- Enhanced user interface with data summary and export options.
- Included error handling and success messages for export operations.
- Updated dependencies in the lock file to include reportlab and lxml for PDF generation.
- Added coverage version 7.10.1 with multiple wheel distributions.
- Added iniconfig version 2.1.0 with its wheel distribution.
- Added pluggy version 1.6.0 with its wheel distribution.
- Added pygments version 2.19.2 with its wheel distribution.
- Added pytest version 8.4.1 with its wheel distribution and dependencies.
- Added pytest-cov version 6.2.1 with its wheel distribution and dependencies.
- Added pytest-mock version 3.14.1 with its wheel distribution and dependencies.
- Updated dev-dependencies to include coverage, pytest, pytest-cov, and pytest-mock.
- Updated requires-dist to specify minimum versions for coverage, pytest, pytest-cov, and pytest-mock.
