refactor: streamline animation suggestion format for clarity and consistency

prompts/predict_decompose_group.txt

@@ -53,17 +53,14 @@ Please follow these steps to analyze and decompose the SVG code. For each step,
    Step 1: [First animation action - describe which elements animate, how they move, timing]
    Step 2: [Second animation action that follows - describe the next sequential movement]
    Step 3: [Final animation action - describe the concluding animation]
-   Why this works: [Explain how this sequence utilizes the SVG structure effectively]
    Scenario 2: [Scenario Name]
    Step 1: [Different first animation action]
    Step 2: [Sequential second action]
    Step 3: [Sequential final action]
-   Why this works: [Explanation of structural benefits]
    Scenario 3: [Scenario Name]
    Step 1: [Third unique animation sequence start]
    Step 2: [Sequential middle action]
    Step 3: [Sequential concluding action]
-   Why this works: [Explanation of how it leverages the decomposed structure]
    Each scenario should tell a complete visual story through sequential animations, with smooth transitions between steps.
    </animation_suggestions>