feat: replace obsolete spinners with branded UI loading component

frontend/src/views/FavoritesView.vue

@@ -4,6 +4,7 @@ import { useRouter } from 'vue-router'
 import { useFavoritesStore } from '@/stores/favorites'
 import { useI18n } from 'vue-i18n'
 import { getImageUrl as utilGetImageUrl } from '@/utils/imageUrl'
+import LoadingBranded from '@/components/common/LoadingBranded.vue'
 
 const router = useRouter()
 const { t } = useI18n()
@@ -93,8 +94,7 @@ const hasVisibleItems = computed(() =>
 
     <!-- ── Loading ── -->
     <div v-if="favoritesStore.isLoading" class="state-center">
-      <div class="spinner"></div>
-      <p>{{ t('common.loading') }}</p>
+      <LoadingBranded :message="t('common.loading', 'Cargando favoritos')" icon="favorite_border" />
     </div>
 
     <template v-else>