GraphTheme

interface GraphTheme {
  id: string;
  colorScheme: 'light' | 'dark';
  values: GraphThemeValues;
  canvasColors: GraphThemeCanvasColor[];
  defaultAnnotationColorIds: GraphThemeAnnotationColorIds;
}

interface GraphThemeCanvasColor {
  id: string; // Unique ID, persists across theme changes
  label?: string; // Display name in color picker
  value: string; // Hex color
}

interface GraphThemeAnnotationColorIds {
  arrowStroke?: string; // Canvas color ID for arrow strokes
  shapeFill?: string; // Canvas color ID for shape fills
}