Upgrade to Next.js 15.1

[shige]

Task description

Upgrade the project to Next.js 15.1.

Background

Upgrading to Next.js 15.1 is necessary to take advantage of the latest features, improvements, and bug fixes provided by the Next.js framework. It's important to keep the project updated to ensure security, performance, and compatibility with modern web standards. Referencing the official blog post is essential for understanding the changes that come with this upgrade.

TODO (Optional)

• Update the Next.js version in the package.json file.
• Test the application to ensure that all features work correctly after the upgrade.
• Review the new features and updates in Next.js 15.1 and implement any necessary changes in the codebase.

Additional notes (Optional)

For more details on the changes and improvements in this version, please refer to the official documentation: Next.js 15.1.