feat(web): show active sandbox details in Box status popover

Display sandbox count and a detailed list of active sessions including
session ID, image, backend, resources (CPU/memory), network mode, and
last used time. Fetched from GET /api/v1/box/sessions in parallel.
Includes i18n for all 8 supported languages.

web/src/i18n/locales/es-ES.ts

@@ -485,7 +485,12 @@ const esES = {
     boxUnavailable: 'No disponible',
     boxBackend: 'Backend',
     boxProfile: 'Perfil',
+    boxSandboxes: 'Sandboxes',
     boxErrors: 'Errores',
+    boxSessionImage: 'Imagen',
+    boxSessionBackend: 'Backend',
+    boxSessionResources: 'Recursos',
+    boxSessionNetwork: 'Red',
     boxStatusLoadFailed: 'Error al cargar el estado de Box',
     failedToGetDebugInfo: 'Error al obtener la información de depuración',
     copiedToClipboard: 'Copiado al portapapeles',