Update files to JSX format

[Robert27]

Even if it is not necessary in Next.js, it is still best practice to mark the corresponding files as JSX as soon as they contain HTML components.

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Summary

📱🛠️🌐

Renamed all React components from .js to .jsx extension to follow the convention and improve syntax highlighting. No functional changes were made.

_is_valid checks_ refactored for clarity autumn leaves falling

Walkthrough

• Renamed all .js files in rogue-thi-app/ and its subdirectories to .jsx to reflect the use of JSX syntax (link-link)