Function updateNestedSetting

src/components/ChartCustomizationPanel.tsx:53–66

(
    key: K,
    nestedKey: string,
    value: any
  )

  };

  const updateNestedSetting = <K extends keyof ChartSettings>(
    key: K,
    nestedKey: string,
    value: any
  ) => {
    const nestedSettings = settings[key] as any;
    onSettingsChange({
      ...settings,
      [key]: {
        ...nestedSettings,
        [nestedKey]: value,
      },
    });
  };

  const addCustomColor = () => {
    if (customColor && !settings.customColors.includes(customColor)) {