Sounds: survive an audio device that crashes the app on open

A Windows friend's 1.3.0 dies about a second in on every start, right
around the 2 s audio warm-up (no Dart error, no close lines). Opening the
device is now logged and leaves audio-init.pending until it returns; a
start that finds it skips sounds instead of crashing again, and a sound
preview in Settings tries once more.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

apps/desktop/lib/main.dart

@@ -49,6 +49,8 @@ Future<void> main(List<String> args) async {
   await AppSettings.instance.ensureLoaded();
   // The composition root: every system, made once.
   final graph = AppGraph.build();
+  // Sounds stay off after an audio-device crash (see SoundEngine.crashMark).
+  graph.sfx.engine.crashMark = '${dirs.support}${Platform.pathSeparator}audio-init.pending';
   final ports = graph.ports;
   // Close button / Alt+F4: the orderly close ([shutDownApp]), so others
   // see "left", your server shuts down and no player outlives the engine.