Windows app opens a blank white window

I downloaded the Windows .exe and launched it. A window opens but stays
completely white — no UI, no error, no crash. It just sits there.

**Steps to reproduce**
1. Download Harper_2.9.1_x64-setup.exe
2. Run it
3. Blank white window

**Expected:** the app UI loads.
**Actual:** empty white window, indefinitely.

**Environment**
- Windows 11 [24H2 or whatever `winver` says]
- Ryzen 7 9800X3D / RTX 4070 Super

Start by reproducing the issue with Harper_2.9.1_x64-setup.exe on Windows 11, using the reported Ryzen 7 9800X3D and RTX 4070 Super environment if available. Investigate the startup path for the Windows app and capture any diagnostic output; the fix is complete when the installed app displays its UI instead of an indefinitely blank white window.

Written by the indexing model from the issue text.