refactor: isolate SSE setup

ui/src/main.js

@@ -1,6 +1,7 @@
 import { createApp } from 'vue'
 import { createPinia } from 'pinia'
 import router from './router'
+import { usePlanillasStore } from './stores/usePlanillas'
 
 import App from './App.vue'
 import './style.css'          // Tailwind o tus estilos globales
@@ -8,12 +9,14 @@ import './style.css'          // Tailwind o tus estilos globales
 
 // console.log(`API_BASE_URL: ${API_BASE_URL}`);
 
-const app = 
-createApp(App)
+const app = createApp(App)
 
-
-
-app.use(createPinia())
+const pinia = createPinia()
+app.use(pinia)
 app.use(router)
 
+// iniciar suscripción SSE cuando la app monte
+const store = usePlanillasStore(pinia)
+store.subscribeToEvents()
+
 app.mount('#app')