Daily color

Create a WordPress block that displays a daily rotating accessible color combination with background and text colors. The block shows a preview area with the current color pair and displays both the color names and hex codes below. Colors automatically update daily at midnight using a deterministic algorithm based on the current date to ensure consistency across all sites. Include a subtle fade transition animation when colors change. In the editor, show a live preview with the same styling as the frontend. The block should be lightweight with no external dependencies, use CSS custom properties for easy theme integration, and ensure all color combinations meet WCAG AA contrast requirements. Provide options to manually refresh the color combination and optionally lock to a specific date for testing purposes.