Add support for file copy and paste inside Java Projects

There is no option for copy and paste file under Java Project. 

<img width="526" height="292" alt="Image" src="https://github.com/user-attachments/assets/e1d31522-b3fa-4e70-a9a4-b4c2d5068afd" />

I must go to another view only to copy and past it

<img width="387" height="586" alt="Image" src="https://github.com/user-attachments/assets/14b3a22f-7c49-4ab6-831a-d86a23452641" />