Steam: webhelper is not responding

**What Game**
steam

**Describe the bug**
attempting to launch steam (`FEXLoader steam`) results in a window that shows "Steamwebhelper is not responding"

**To Reproduce**
Steps to reproduce the behavior:
1. Install FEX (Noble PPA armv8.0) with 24.04 rootfs
2. Install steam to the host system
3. start steam with `FEXLoader steam`
4. See error

**Expected behavior**
Works

**System information:**
- OS: Ubuntu 24.04
- CPU/SoC: Tegra X1
- Video driver version: 32.3.1
- RootFS used: Ubuntu 24.04 Official Rootfs
- FEX version: FEX-2407
- Thunks Enabled: GL and Vulkan

Start by reproducing the reported launch sequence with FEXLoader steam on Ubuntu 24.04 and the listed Tegra X1 setup. Investigate why Steamwebhelper is not responding, using the reported FEX version, rootfs, video driver, and thunk configuration; done means Steam launches without that error.

Written by the indexing model from the issue text.