Dev

[isaaclins]

This pull request adds robust support for customizing theme fonts in the application, including both font family and font size. It introduces new fields to the CustomTheme struct, validation logic for these fields, serialization and import/export functionality, and updates the UI to allow users to edit and save theme font settings. Additionally, it ensures that font settings are correctly applied throughout the app and includes comprehensive tests for theme serialization and validation.

Theme font customization:

• Added font_family and font_size fields to the CustomTheme struct, with defaults and validation logic to ensure valid values and backward compatibility. [1] [2]
• Updated theme setup logic in ui/theme.rs to apply custom font settings, including parsing font family names and adjusting font sizes for UI elements. [1] [2]

Theme import/export:

• Implemented methods for exporting and importing custom themes as JSON files, including error handling and user feedback in the delegate. [1] [2]

User interface enhancements:

• Extended the preferences UI to include controls for editing font family and font size, and added buttons for exporting/importing theme files.

Testing and validation:

• Added a comprehensive test suite for theme serialization, validation of color and font fields, and backward compatibility with older theme files.