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(),
   };

packages/desktop/src/features/auto-updater.ts

@@ -98,6 +98,7 @@ export async function checkForAppUpdate(currentVersion: string): Promise<AppUpda
 
 export async function downloadAndInstallUpdate(
   currentVersion: string,
+  onBeforeQuit?: () => Promise<void>,
 ): Promise<AppUpdateInstallResult> {
   if (!app.isPackaged) {
     return {
@@ -131,8 +132,9 @@ export async function downloadAndInstallUpdate(
     await autoUpdater.downloadUpdate();
     // quitAndInstall restarts the app with the new version.
     // Use a short delay to allow the renderer to receive the response.
-    setTimeout(() => {
+    setTimeout(async () => {
       try {
+        if (onBeforeQuit) await onBeforeQuit();
         autoUpdater.quitAndInstall(/* isSilent */ false, /* isForceRunAfter */ true);
       } catch (error) {
         console.error("[auto-updater] quitAndInstall failed:", error);