By Caitlin Moore, The Washington Post Three stars. Rated PG. 96 minutes. Disney films tend to follow a recipe that includes a hero’s journey (either figurative or literal), a sidekick, catchy songs, a villain and a lesson. The studio’s latest animated feature checks all those boxes, while still managing to enthrall. “Moana” may not be “The Little Mermaid” or “Aladdin,” but the film, set among the islands of Polynesia, boasts not only cultural authenticity but also a young heroine who is steadfast and proud, even as she struggles to find her way.