Describe the bug
vrmonitor aborts on startup when launched via Steam. The vrstartup-linux.txt says:

[2026-04-28 20:36:45] 04/28 20:36:45 minidumps folder is set to /tmp/dumps
[2026-04-28 20:36:45] 04/28 20:36:45 Init: Installing breakpad exception handler for appid(250820)/version(2.16.3)/tid(182755)
[2026-04-28 20:36:45] This application failed to start because it could not find or load the Qt platform plugin "wayland;xcb".
[2026-04-28 20:36:45]
[2026-04-28 20:36:45] Available platform plugins are: xcb.
[2026-04-28 20:36:45]
[2026-04-28 20:36:45] Reinstalling the application may fix this problem.
[2026-04-28 20:36:45] crash_20260428203645_2.dmp[182758]: Uploading dump (out-of-process)

To Reproduce
Steps to reproduce the behavior:

1. Open SteamVR

Expected behavior
vrmonitor launches successfully and SteamVR startup sequence continues

System Information (please complete the following information):
Please use the latest Steam beta client and SteamVR beta for your bug reports!

• Steam client version (build number or date): 1777411435
• SteamVR version: 2.16.3
• Distribution (e.g. Ubuntu): Arch Linux
• Steam runtime diagnostics: steam-runtime-diagnostics.txt
• Steam and SteamVR logs: logs.tar.gz
• Minidumps: minidumps.tar.gz

Additional context
Setting the launch command to QT_QPA_PLATFORM=xcb %command% fixes the issue.