Borderless windowed mode

Hello guys! I suggest and I got an issue with the client where I can't use borderless windowed mode at all with the client... So I really suggest a fix for this please! Thanks.

-windowed -noborder _[My launch parameters]_

What happens:

<img width="1365" height="767" alt="Image" src="https://github.com/user-attachments/assets/d0404629-790d-462b-9fdb-d857607bc377" />