fix(desktop): show a splash when the local backend never becomes ready#23637

fix(desktop): only reopen the splash on activate after a slow start

fix(desktop): reopen the splash on activate and keep sign-in returns out of it

Merge remote-tracking branch 'origin/main' into fix/issue-23372

fix(desktop): reveal the connecting splash on Wayland too

fix(desktop): show the connecting splash when the local backend is slow to start

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