feat(offers,invoices): per-currency 'Celkem' totals beneath the lists (consistent with orders)

Mirrors the orders totals exactly: /stats (offers) + /list-totals (issued +
received invoices) endpoints sum each doc's total per currency across the active
filter (reusing extracted where-builders so they stay in sync with the lists),
rendered as the identical 'Celkem: …' block via the shared formatMultiCurrency.
Existing invoice/received KPI stats untouched.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/admin/lib/queries/invoices.ts

@@ -192,6 +192,31 @@ export const invoiceStatsOptions = (month: number, year: number) =>
       ),
   });
 
+// Per-currency total over the WHOLE filtered set of the ISSUED-invoice list.
+// Distinct from `invoiceStatsOptions` (the KPI cards) — hits /list-totals and
+// passes the same filters the issued list uses (search/status/month/year).
+export const invoiceTotalsOptions = (filters: {
+  search?: string;
+  status?: string;
+  month?: number;
+  year?: number;
+}) =>
+  queryOptions({
+    queryKey: ["invoices", "list-totals", filters],
+    queryFn: async () => {
+      const params = new URLSearchParams();
+      if (filters.search) params.set("search", filters.search);
+      if (filters.status) params.set("status", filters.status);
+      if (filters.month) params.set("month", String(filters.month));
+      if (filters.year) params.set("year", String(filters.year));
+      const qs = params.toString();
+      const data = await jsonQuery<{ totals?: CurrencyAmount[] }>(
+        `/api/admin/invoices/list-totals${qs ? `?${qs}` : ""}`,
+      );
+      return data.totals ?? [];
+    },
+  });
+
 export const receivedInvoiceStatsOptions = (month: number, year: number) =>
   queryOptions({
     queryKey: ["invoices", "received", "stats", month, year],
@@ -201,6 +226,30 @@ export const receivedInvoiceStatsOptions = (month: number, year: number) =>
       ),
   });
 
+// Per-currency total over the WHOLE filtered set of the received-invoice list.
+// Distinct from `receivedInvoiceStatsOptions` (the KPI cards) — hits
+// /list-totals and passes the same filters the received list uses
+// (month/year/search). `amount` is GROSS (VAT-inclusive).
+export const receivedInvoiceTotalsOptions = (filters: {
+  month?: number;
+  year?: number;
+  search?: string;
+}) =>
+  queryOptions({
+    queryKey: ["invoices", "received", "list-totals", filters],
+    queryFn: async () => {
+      const params = new URLSearchParams();
+      if (filters.month) params.set("month", String(filters.month));
+      if (filters.year) params.set("year", String(filters.year));
+      if (filters.search) params.set("search", filters.search);
+      const qs = params.toString();
+      const data = await jsonQuery<{ totals?: CurrencyAmount[] }>(
+        `/api/admin/received-invoices/list-totals${qs ? `?${qs}` : ""}`,
+      );
+      return data.totals ?? [];
+    },
+  });
+
 export const invoiceDetailOptions = (id: string | undefined) =>
   queryOptions({
     queryKey: ["invoices", id],

src/admin/lib/queries/offers.ts

@@ -1,6 +1,11 @@
 import { queryOptions } from "@tanstack/react-query";
 import { jsonQuery, paginatedJsonQuery } from "../apiAdapter";
 
+export interface CurrencyAmount {
+  amount: number;
+  currency: string;
+}
+
 export interface ItemTemplate {
   id: number;
   name: string;
@@ -91,6 +96,27 @@ export const offerListOptions = (filters: {
     },
   });
 
+export const offerStatsOptions = (filters: {
+  search?: string;
+  status?: string;
+  customer_id?: number;
+}) =>
+  queryOptions({
+    queryKey: ["offers", "stats", filters],
+    queryFn: async () => {
+      const params = new URLSearchParams();
+      if (filters.search) params.set("search", filters.search);
+      if (filters.status) params.set("status", filters.status);
+      if (filters.customer_id)
+        params.set("customer_id", String(filters.customer_id));
+      const qs = params.toString();
+      const data = await jsonQuery<{ totals?: CurrencyAmount[] }>(
+        `/api/admin/offers/stats${qs ? `?${qs}` : ""}`,
+      );
+      return data.totals ?? [];
+    },
+  });
+
 export interface OfferItemData {
   id?: number;
   description: string;