Handle session expiration correctly and fix icon CORS errors

- Detect CORS/redirect errors from Authentik and interpret them as
  "no session" instead of generic error
- When session expires, Authentik returns 302 redirect to login which
  causes CORS error in fetch requests
- Add /api/_nuxt_icon/ to public routes to prevent icon load failures
  after logout

This fixes the issue where logout in Authentik showed "Error" instead
of "Sin Sesión" when checking session status.

docker-compose.yml

@@ -24,7 +24,7 @@ services:
       - "traefik.http.services.${APP_NAME}.loadbalancer.server.port=3000"
 
       # Router 1: Public PWA resources (no auth) - Higher priority
-      - "traefik.http.routers.${APP_NAME}-public.rule=Host(`${APP_DOMAIN}`) && (PathPrefix(`/manifest.webmanifest`) || PathPrefix(`/sw.js`) || PathPrefix(`/workbox-`) || PathPrefix(`/icon-`) || PathPrefix(`/apple-touch-icon`) || PathPrefix(`/favicon.ico`) || PathPrefix(`/robots.txt`))"
+      - "traefik.http.routers.${APP_NAME}-public.rule=Host(`${APP_DOMAIN}`) && (PathPrefix(`/manifest.webmanifest`) || PathPrefix(`/sw.js`) || PathPrefix(`/workbox-`) || PathPrefix(`/icon-`) || PathPrefix(`/apple-touch-icon`) || PathPrefix(`/favicon.ico`) || PathPrefix(`/robots.txt`) || PathPrefix(`/api/_nuxt_icon/`))"
       - "traefik.http.routers.${APP_NAME}-public.entrypoints=websecure"
       - "traefik.http.routers.${APP_NAME}-public.tls.certresolver=letsencrypt"
       - "traefik.http.routers.${APP_NAME}-public.priority=100"

nuxt4/app/composables/useAuthentik.ts

@@ -86,7 +86,24 @@ export const useAuthentik = () => {
         })
       }
     } catch (error) {
-      // Error al consultar
+      // Si el error es por redirect de Authentik (CORS/fetch error), significa que no hay sesión
+      // Authentik redirige a login cuando no hay sesión válida, causando error CORS en fetch
+      const errorMessage = error?.message || error?.toString() || ''
+      const isCorsOrRedirectError = errorMessage.includes('Failed to fetch') ||
+                                     errorMessage.includes('CORS') ||
+                                     error?.statusCode === 302
+
+      if (isCorsOrRedirectError) {
+        // Interpretar como sesión expirada/inválida
+        toast.add({
+          title: 'Sin Sesión',
+          description: 'No hay sesión activa en Authentik',
+          color: 'warning',
+          icon: 'i-heroicons-exclamation-triangle',
+          timeout: 5000
+        })
+      } else {
+        // Error real de red o servidor
         toast.add({
           title: 'Error',
           description: 'No se pudo verificar el estado de la sesión',
@@ -94,6 +111,7 @@ export const useAuthentik = () => {
           icon: 'i-heroicons-x-circle',
           timeout: 5000
         })
+      }
       console.error('Error checking session status:', error)
     }
   }