fix: robust mobile suspend and auth recovery

frontend/src/stores/shuttle.ts

@@ -10,19 +10,38 @@ export const useShuttleStore = defineStore('shuttle', () => {
     const error = ref<string | null>(null)
     const filters = ref<ShuttleFilters>({})
 
-    async function loadShuttles(newFilters?: ShuttleFilters) {
-        isLoading.value = true
+    // Safety: nunca más de 12s cargando (protección contra thread congelado por OS al apagar pantalla)
+    let _safetyTimer: ReturnType<typeof setTimeout> | null = null
+    function _startSafetyTimer() {
+        _clearSafetyTimer()
+        _safetyTimer = setTimeout(() => {
+            if (isLoading.value) {
+                console.warn('SIBU | shuttleStore: safety timeout — reseteando isLoading')
+                isLoading.value = false
+            }
+        }, 12000)
+    }
+    function _clearSafetyTimer() {
+        if (_safetyTimer) { clearTimeout(_safetyTimer); _safetyTimer = null }
+    }
+
+    async function loadShuttles(newFilters?: ShuttleFilters, isBackground = false) {
+        if (!isBackground) isLoading.value = true
         error.value = null
         if (newFilters) {
             filters.value = newFilters
         }
+        if (!isBackground) _startSafetyTimer()
         try {
             shuttles.value = await shuttlesService.getAllShuttles(filters.value)
         } catch (e) {
             error.value = e instanceof Error ? e.message : 'Failed to load shuttles'
             console.error('Error loading shuttles:', e)
         } finally {
-            isLoading.value = false
+            if (!isBackground) {
+                _clearSafetyTimer()
+                isLoading.value = false
+            }
         }
     }