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/app/infra/entities/api/index.ts

@@ -364,6 +364,20 @@ export interface ApiRespBoxStatus {
   session_ttl_sec?: number;
 }
 
+export interface BoxSessionInfo {
+  session_id: string;
+  backend_name: string;
+  image: string;
+  network: string;
+  host_path: string | null;
+  host_path_mode: string;
+  mount_path: string;
+  cpus: number;
+  memory_mb: number;
+  created_at: string;
+  last_used_at: string;
+}
+
 export interface ApiRespAsyncTasks {
   tasks: AsyncTask[];
 }