feat: pin sessions to workspace revisions

frontend/src/shell/NewSessionDialog.test.tsx

@@ -27,9 +27,13 @@ test("the form has only a question field (no workspace/model/provider/thinking)"
   expect(screen.queryByLabelText(/thinking/i)).not.toBeInTheDocument();
 });
 
-test("submitting posts only { question } and calls onCreated", async () => {
+test("submitting includes browser-local migrated preferences and calls onCreated", async () => {
+  localStorage.clear();
   let body: unknown = null;
   server.use(
+    http.get("http://localhost:8787/settings", () => HttpResponse.json({
+      workspace: "default", provider: "zai", model: "glm-5.2", thinking: "low",
+    })),
     http.post("http://localhost:8787/sessions", async ({ request }) => {
       body = await request.json();
       return HttpResponse.json({ id: "s1" });
@@ -40,7 +44,10 @@ test("submitting posts only { question } and calls onCreated", async () => {
   await userEvent.type(await screen.findByLabelText(/question/i), "Quante vendite nel 2025?");
   await userEvent.click(screen.getByRole("button", { name: /^create$/i }));
 
-  await waitFor(() => expect(body).toEqual({ question: "Quante vendite nel 2025?" }));
+  await waitFor(() => expect(body).toEqual({
+    question: "Quante vendite nel 2025?",
+    workspaceId: "default", provider: "zai", model: "glm-5.2", thinking: "low",
+  }));
   await waitFor(() => expect(onCreated).toHaveBeenCalledWith("s1"));
 });