Allow any additional CSS custom properties
Optional--Accent color
Optional--Background color for the main widget container
Optional--Border color
Optional--Background color for card elements
Optional--Background color for card elements when in dark mode
Optional--Text color for card elements when in dark mode
Optional--Text color
Optional--Background color for input fields
Optional--Muted text color
Optional--Background color for para overlay
Optional--Primary brand color
Optional--Primary foreground (text) color
Optional--Secondary color
Theme configuration for customizing the widget's appearance. Uses CSS custom properties for styling.