Category 7.1 – Windows Installer

**Task:** WiX-based setup  

**Task Description:**  
Create a WiX installer bundle for Trion Desktop that includes binaries, dependencies, and optional SQL Express with upgrade-safe configuration.

**Requirements:**  
- [ ] Bundle binaries  
- [ ] Signed MSI  
- [ ] Settings retention on update  

**Testing Requirements:**  
- [ ] Verify clean install/uninstall  
