feat(frontend): add 6 query/mutation hooks (batches, claims, remits, providers, activity, parse)

src/hooks/useBatches.ts

@@ -0,0 +1,15 @@
+import { useQuery } from "@tanstack/react-query";
+import { api, type BatchSummary } from "@/lib/api";
+
+/**
+ * Lists parsed batches. Batches are only available when a backend is
+ * configured — when running in sample-data mode there's no persisted
+ * history, so we leave the query disabled.
+ */
+export function useBatches(limit?: number) {
+  return useQuery<BatchSummary[]>({
+    queryKey: ["batches", limit ?? null],
+    queryFn: () => api.listBatches(limit),
+    enabled: api.isConfigured,
+  });
+}