Function apply

frontend/src/ts/controllers/theme-controller.ts:54–81

(
  themeName: ThemeIdentifier,
  customColorsOverride?: CustomThemeColors,
  isPreview = false,
)

}

async function apply(
  themeName: ThemeIdentifier,
  customColorsOverride?: CustomThemeColors,
  isPreview = false,
): Promise<void> {
  console.debug(`Theme controller applying theme ${themeName}`, {
    customColorsOverride,
    isPreview,
  });

  const isCustom = themeName === "custom";

  const themeColors = isCustom
    ? convertCustomColorsToTheme(
        customColorsOverride ?? Config.customThemeColors,
      )
    : themes[themeName];

  setTheme({ ...themeColors, name: themeName });

  updateThemeIndicator(isPreview ? themeName : undefined);

  if (isColorDark(themeColors.bg)) {
    qs("body")?.addClass("darkMode");
  } else {
    qs("body")?.removeClass("darkMode");
  }
}

function updateThemeIndicator(nameOverride?: string): void {
  //text