Fix invoice period i18n release gate (#245)

Replace unreviewed dynamic invoice-period translation calls with a bounded literal-key contract and focused fallback coverage.

tests/unit/invoicing-period-review-workspace.spec.js

@@ -3,10 +3,26 @@ import { readFileSync } from "node:fs";
 import { fileURLToPath } from "node:url";
 import { buildPeriodCacheKey } from "../../src/views/dashboards/superUserDashboard/InvoicingBillingPeriod/imports/InvoicingBillingPeriodImportPaging.js";
 import { deriveLegacyPeriodCustomerReview } from "../../src/views/dashboards/superUserDashboard/InvoicingBillingPeriod/services/invoicingPeriodReview.js";
+import { translateInvoicingPeriodReview } from "../../src/views/dashboards/superUserDashboard/InvoicingBillingPeriod/services/invoicingPeriodTranslation.js";
 
 const readProjectFile = (path) => readFileSync(fileURLToPath(new URL(`../../${path}`, import.meta.url)), "utf8");
 
 describe("invoicing period review workspace", () => {
+  it("translates only the bounded review-workspace key contract", () => {
+    const calls = [];
+    const composer = {
+      t(key, params) {
+        calls.push([key, params]);
+        return key === "invoicing_period.review_workspace.queue.count" ? `${params.count} kunder` : key;
+      },
+    };
+
+    expect(translateInvoicingPeriodReview(composer, "queue.count", "fallback", { count: 3 })).toBe("3 kunder");
+    expect(translateInvoicingPeriodReview(composer, "queue.unknown", "fallback")).toBe("fallback");
+    expect(translateInvoicingPeriodReview(composer, "../queue.count", "fallback")).toBe("fallback");
+    expect(calls).toEqual([["invoicing_period.review_workspace.queue.count", { count: 3 }]]);
+  });
+
   it("scopes cached pages by every server-side review and sorting input", () => {
     const base = {
       dateFrom: "2026-08-01",