- Introduced utility functions for color manipulation: `fhHexToRgb`, `fhRgbToHex`, `fhMixHex`, `fhRelativeLuminance`, and `fhContrastText`.
- Implemented a comprehensive theme palette based on the user's favorite color, including primary, secondary, and semantic colors.
- Updated CSS variables in the stylesheet to reflect the new theme structure, enhancing consistency across the UI.
- Modified header to dynamically apply theme styles based on the generated palette, improving visual coherence.
- Added banking mode with checking, savings, and charity accounts, including auto-split options for income.
- Introduced banking transaction management, including transfers and charity outflows.
- Updated family settings to allow configuration of banking features and interest rates.
- Enhanced data export functionality to include bank transactions.
- Improved user interface to display banking information and donation goals.
- Updated documentation to reflect new banking features and settings.
