Add full shell, replaceable Omics adapter and bilingual interaction

Implement approved specification #32 and tickets #33-#37. Keep host authentication server-verified and pin session interaction language. Compile scoped base selectors for browser compatibility and retain full gutters during CSS pruning.

frontend/src/shell/WorkspacePreprocessingControl.test.tsx

@@ -1,4 +1,5 @@
-import { render, screen, waitFor } from "@testing-library/react";
+import { act, render, screen, waitFor } from "@testing-library/react";
+import { setLocale } from "../i18n";
 import userEvent from "@testing-library/user-event";
 import { QueryClient, QueryClientProvider } from "@tanstack/react-query";
 import { http, HttpResponse } from "msw";
@@ -6,6 +7,16 @@ import { server } from "../test/msw";
 import type { WorkspacePreprocessingStatus } from "../api/workspace-preprocessing";
 import { WorkspacePreprocessingControl } from "./WorkspacePreprocessingControl";
 
+afterEach(() => act(() => setLocale("en")));
+
+test("translates a live readiness diagnostic while preserving its catalog revision", () => {
+  renderControl({ schemaVersion: 1, workspaceId: "catalog-workspace", state: "ready",
+    actionable: true, clearable: true, detail: "Catalog revision 18 is indexed." });
+  act(() => setLocale("it"));
+  expect(screen.getByText("La revisione 18 del Catalogo è indicizzata.")).toBeVisible();
+  expect(screen.getByRole("button", { name: "Esegui di nuovo" })).toBeEnabled();
+});
+
 function renderControl(status: WorkspacePreprocessingStatus) {
   const client = new QueryClient({ defaultOptions: { queries: { retry: false } } });
   return render(