fix: transport AppImage args via env and gate restart on app-ping

- Transport Linux AppImage CLI args through SUBMINER_APP_ARGC/ARG_* env vars instead of argv
- Add --app-ping command to probe single-instance lock ownership (exit 0 = running, 1 = not)
- Gate manual restart: poll app-ping until old app releases lock, then until new app owns it
- Preserve user-paused playback when disarming the auto-play-ready gate on restart
- Snapshot subtitles before connection side effects (sub-visibility hide) can suppress them
- Reapply overlay bounds after first show for Hyprland compatibility

src/main.ts

@@ -725,6 +725,7 @@ type BootServices = MainBootServicesResult<
   {
     requestSingleInstanceLock: () => boolean;
     quit: () => void;
+    exit: (code?: number) => void;
     on: (event: string, listener: (...args: unknown[]) => void) => unknown;
     whenReady: () => Promise<void>;
   }
@@ -3405,7 +3406,7 @@ const {
     stopConfigHotReload: () => configHotReloadRuntime.stop(),
     restorePreviousSecondarySubVisibility: () => restorePreviousSecondarySubVisibility(),
     restoreMpvSubVisibility: () => {
-      restoreOverlayMpvSubtitles();
+      restoreOverlayMpvSubtitles({ force: true });
     },
     unregisterAllGlobalShortcuts: () => globalShortcut.unregisterAll(),
     stopSubtitleWebsocket: () => {