[6h] separate reusable components

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The issue title suggests identifying and extracting reusable UI components from the existing codebase. Start by exploring the component structure in the src/ directory to understand current patterns. Look for repeated JSX or logic that could be abstracted. Determine what 'separate' means in this context—creating a shared component library or simply modularizing within the project.

索引モデルが issue の本文から書いたものです。