test(desktop): reproduce #23372, no window after primary readiness timeout

The primary backend stays alive but never passes its readiness probe.
After the readiness timeout the desktop never asks for the connecting
splash, so a non-WSL user is left with no window indefinitely.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
de878289c0Julius Marminge committed on 10/22/2026, 12:28:05 PMparent8d3b061
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