feat: pin sessions to workspace revisions

frontend/src/shell/AppShell.new-session.test.tsx

@@ -13,6 +13,7 @@ function renderShell() {
 }
 
 beforeEach(() => {
+  localStorage.clear();
   FakeEventSource.instances = [];
   (globalThis as any).EventSource = FakeEventSource;
   useSessionStore.getState().resetSession();
@@ -121,8 +122,7 @@ test("a DWH-unreachable precheck shows a specific alert and preserves the questi
   expect(FakeEventSource.instances).toHaveLength(0);
 });
 
-test("model selector shows the three Pi-enabled models and persists the selected provider", async () => {
-  let saved: unknown;
+test("model selector shows the three Pi-enabled models and stores the selected provider locally", async () => {
   server.use(
     http.get("http://localhost:8787/settings", () => HttpResponse.json({
       workspace: "default", provider: "zai", model: "glm-5.2", thinking: "low",
@@ -132,11 +132,6 @@ test("model selector shows the three Pi-enabled models and persists the selected
       { provider: "deepseek", id: "deepseek-v4-flash", name: "DeepSeek V4 Flash", reasoning: true },
       { provider: "local-qwen", id: "qwen3.6-35b-a3b", name: "Qwen3.6 35B A3B Local", reasoning: false },
     ] })),
-    http.put("http://localhost:8787/settings", async ({ request }) => {
-      const body = await request.json() as Record<string, string>;
-      saved = body;
-      return HttpResponse.json(body);
-    }),
   );
   renderShell();
 
@@ -147,9 +142,10 @@ test("model selector shows the three Pi-enabled models and persists the selected
     ]);
   });
   await userEvent.selectOptions(select, "qwen3.6-35b-a3b");
-  await waitFor(() => expect(saved).toMatchObject({
-    provider: "local-qwen", model: "qwen3.6-35b-a3b",
-  }));
+  await waitFor(() => expect(JSON.parse(localStorage.getItem("thothii.workspace-registry.v1.preferences")!))
+    .toEqual({
+      workspaceId: "default", provider: "local-qwen", model: "qwen3.6-35b-a3b", thinking: "low",
+    }));
 });