make windows installer better

1. it's ugly as FUCK! 

<img width="490" height="381" alt="Image" src="https://github.com/user-attachments/assets/87939713-55ec-49b0-b43a-5cce9fae3543" />

2. it installs system-wide, requiring admin rights. DONT DO THIS, just install for user.
3. it doesnt even install shortcuts, just adds `ironfoil-gui` to PATH..