feat(web): mutation hooks + InUseError + i18n for reference-data edit/delete

web/src/api/queries.test.ts

@@ -0,0 +1,11 @@
+import { describe, it, expect } from "vitest";
+
+import { InUseError } from "./queries";
+
+describe("InUseError", () => {
+  it("carries the count", () => {
+    const e = new InUseError(7);
+    expect(e.count).toBe(7);
+    expect(e).toBeInstanceOf(Error);
+  });
+});