feat(ai): dashboard chat widget with invoice import + budget indicator

src/admin/lib/queries/ai.ts

@@ -0,0 +1,27 @@
+import { queryOptions } from "@tanstack/react-query";
+import { jsonQuery } from "../apiAdapter";
+
+export interface AiUsage {
+  configured: boolean;
+  month_spend_usd: number;
+  budget_usd: number;
+  remaining_usd: number;
+}
+
+export interface ExtractedInvoice {
+  supplier_name: string;
+  invoice_number: string | null;
+  amount: number;
+  currency: string;
+  vat_rate: number;
+  issue_date: string | null;
+  due_date: string | null;
+  description: string | null;
+}
+
+export const aiUsageOptions = () =>
+  queryOptions({
+    queryKey: ["ai", "usage"],
+    queryFn: () => jsonQuery<AiUsage>("/api/admin/ai/usage"),
+    staleTime: 30_000,
+  });