chore: linting

donut-sync/src/auth/auth.guard.ts

@@ -27,7 +27,7 @@ export class AuthGuard implements CanActivate {
     const request = context.switchToHttp().getRequest<Request>();
     const authHeader = request.headers.authorization;
 
-    if (!authHeader || !authHeader.startsWith("Bearer ")) {
+    if (!authHeader?.startsWith("Bearer ")) {
       throw new UnauthorizedException(
         "Missing or invalid authorization header",
       );