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On this onboarding screen, the character card for 'ne' (ね) features a 'Mastered' badge in the top-right corner, represented by an 'M' and a tiny star. To draw attention to this progress milestone, the star icon undergoes a continuous, gentle idle animation where it rotates and scales up and down, creating a delicate sparkling effect. This micro-interaction adds a touch of gamified delight to the learning progress explanation.
