Astra_Global_Palette::is_dark_palette( string $palette_key = 'current' )

	public static function is_dark_palette( $palette_key = 'current' ) {
		if ( $palette_key === 'current' ) {
			if ( ! self::$is_dark_palette ) {
				// Determine if the active global palette is 'palette_4', which is considered dark.
				self::$is_dark_palette = self::astra_get_active_global_palette() === 'palette_4';
			}

			// Return the cached result for the active global palette.
			return self::$is_dark_palette;
		}

		// For a specific palette key, directly check if it's 'palette_4'.
		return $palette_key === 'palette_4';
	}