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[naoki-00-ito]

This pull request includes changes to the src/components/Header directory to refactor button styles by consolidating them into a separate file. The most important changes involve creating a new buttonClass.ts file to centralize button styles and updating the Menu.astro and index.astro components to use these new styles.

Refactoring button styles:

• src/components/Header/buttonClass.ts: Created a new file to define and export buttonOpenClass and buttonCloseClass constants using the cn utility function for consistent button styling.

Updating components to use new button styles:

• src/components/Header/Menu.astro: Modified the CLOSE button to use the buttonCloseClass from the new buttonClass.ts file.
• src/components/Header/Menu.astro: Imported buttonCloseClass from the new buttonClass.ts file.
• src/components/Header/index.astro: Modified the MENU button to use the buttonOpenClass from the new buttonClass.ts file.
• src/components/Header/index.astro: Imported buttonOpenClass from the new buttonClass.ts file.

close #183