fix: block creation when workspace summaries fail

frontend/src/shell/SteerInput.test.tsx

@@ -379,6 +379,44 @@ test("initial submit waits for delayed workspace summaries before allowing a con
   }));
 });
 
+test("failed workspace summaries block creation and report a safe error", async () => {
+  let body: unknown;
+  let failure: string | undefined;
+  let summaryRequestFailed = false;
+  localStorage.setItem("thothii.workspace-registry.v1.preferences", JSON.stringify({
+    workspaceId: "psd-clinical", provider: "zai", model: "glm-5.2", thinking: "medium",
+  }));
+  server.use(
+    http.get("http://localhost:8787/settings", () => HttpResponse.json({ workspace: "psd-clinical" })),
+    http.get("http://localhost:8787/workspaces", () => {
+      summaryRequestFailed = true;
+      return new HttpResponse(null, { status: 503 });
+    }),
+    http.get("http://localhost:8787/models", () => HttpResponse.json({ models: [
+      { provider: "zai", id: "glm-5.2", name: "GLM-5.2", reasoning: true },
+    ] })),
+    http.post("http://localhost:8787/sessions", async ({ request }) => {
+      body = await request.json();
+      return HttpResponse.json({ id: "s1" });
+    }),
+  );
+  const client = new QueryClient({ defaultOptions: { queries: { retry: false } } });
+  render(
+    <QueryClientProvider client={client}>
+      <ComposerFooter />
+      <SteerInput sessionId={null} onSessionCreateFailed={(message) => { failure = message; }} />
+    </QueryClientProvider>,
+  );
+
+  await waitFor(() => expect(summaryRequestFailed).toBe(true));
+  await waitFor(() => expect(client.getQueryState(["workspaces"])?.status).toBe("error"));
+  await userEvent.type(screen.getByRole("textbox", { name: /new question/i }), "q");
+  await userEvent.click(screen.getByRole("button", { name: /send/i }));
+
+  await waitFor(() => expect(failure).toBe("Could not load workspace registry. Please retry."));
+  expect(body).toBeUndefined();
+});
+
 test("submit follows a rapid workspace switch instead of waiting for an abandoned policy", async () => {
   let body: unknown;
   let releaseC!: () => void;