Fix project menu item false selected state caused by CSS class name clash

Summary

Project menu item often appears selected when it is not, likely due to a CSS class name clash with other elements sharing the same class. Suggestion: add a prefix to menu class names to avoid conflicts.

Steps to Reproduce

Not provided.

Expected Behaviour

Project menu item should only appear selected when it is actually selected.

Actual Behaviour

Project menu item often appears selected when it is not.

Environment

Not provided.

Reported by retoor via DevPlace.