fix(desktop): stop daemon before auto-update restart

The daemon is a detached process that survives Electron restarts,
so after an auto-update the old daemon version would keep running.
Now we stop it before quitAndInstall so the new app instance
starts a fresh daemon with the updated binary.

packages/desktop/src/daemon/daemon-manager.ts

@@ -548,7 +548,9 @@ export function createDaemonCommandHandlers(): Record<string, DesktopCommandHand
     },
     install_app_update: async () => {
       const currentVersion = await resolveCurrentUpdateVersion();
-      return downloadAndInstallUpdate(currentVersion);
+      return downloadAndInstallUpdate(currentVersion, async () => {
+        await stopDaemon();
+      });
     },
     get_local_daemon_version: () => getLocalDaemonVersion(),
   };