fix: use relative import in listener guard spec for vitest resolution

Agent-Logs-Url: https://github.com/ElMassimo/iles/sessions/520dc749-530a-41db-8db4-1ac568094e62

Co-authored-by: ElMassimo <1158253+ElMassimo@users.noreply.github.com>

Author: Copilot

packages/iles/tests/listener-guard.spec.ts

@@ -1,6 +1,6 @@
 import { describe, expect, test } from 'vite-plus/test'
 
-import { guardListenerCall } from '@client/app/listenerGuard'
+import { guardListenerCall } from '../src/client/app/listenerGuard'
 
 describe('listener guard', () => {
   test('calls original handler when no island context and reports once', () => {