feat: establish unified administration and model context baseline

frontend/src/models/useInteractionModelBusy.ts

@@ -0,0 +1,18 @@
+import { useQuery } from "@tanstack/react-query";
+import { listDescriptionGenerationRuns } from "../api/catalog-databases";
+import { hasPermission, useAuthUser } from "../auth/authState";
+import { useSessionStore } from "../store/sessionStore";
+
+/** Reuse the existing run cache across Core/Admin navigation; no background job manager. */
+export function useInteractionModelBusy(): boolean {
+  const coreActive = useSessionStore((state) => state.agentActive);
+  const user = useAuthUser();
+  const { data: runs } = useQuery({
+    queryKey: ["description-generation-runs", 50],
+    queryFn: () => listDescriptionGenerationRuns(50),
+    enabled: hasPermission(user, "database.manage"),
+    retry: false,
+    refetchInterval: 5_000,
+  });
+  return coreActive || Boolean(runs?.some((run) => run.status === "queued" || run.status === "running"));
+}