fix: implement global app-refocus listener and data recovery pattern in critical views to prevent infinite loading after app suspension

frontend/src/views/DiscoverView.vue

@@ -1,5 +1,5 @@
 <script setup lang="ts">
-import { ref, onMounted, computed } from 'vue'
+import { ref, onMounted, onUnmounted, computed } from 'vue'
 import { businessService } from '@/services/businessService'
 import type { Business } from '@/types'
 import { useRouter } from 'vue-router'
@@ -54,9 +54,18 @@ async function loadBusinesses() {
   }
 }
 
+function handleRefocus() {
+  loadBusinesses()
+}
+
 onMounted(() => {
   analyticsService.logEvent({ event_name: 'screen_view', screen_name: 'Discover' })
   loadBusinesses()
+  window.addEventListener('app-refocus', handleRefocus)
+})
+
+onUnmounted(() => {
+  window.removeEventListener('app-refocus', handleRefocus)
 })
 
 // ── Computados