style: format code with Prettier

[deepsource-autofix[bot]]

This commit fixes the style issues introduced in fd5f530 according to the output from Prettier.

Details: None

[what-the-diff[bot]]

PR Summary

• Improved Code Readability and Conformance The updated appmenu.css file now includes a newline at the end. This small, but important change will make the code easier to read and maintain. It also ensures compliance with universal coding conventions, enhancing collaborative efforts.