feat(agent): support Responses steering and project-aware tools

Use the dedicated TJWATER_AGENT_URL and Responses stream protocol. Keep running
turns active while users steer or queue follow-ups and edit pending delivery.
Refresh the model catalog before generation and preserve approval mode selection.

Integrate scoped investigation messaging/presentation, geographic place selection,
current Agent composer styles and supporting workbench contracts.

Validation: 77 focused Vitest checks, 21 browser cases, lint, typecheck and
production build. Preserve direct Server/Agent routing and project authentication.

tests/browser/workbench-visual.e2e.ts

@@ -186,7 +186,7 @@ async function prepareDeterministicWorkbench(page: Page) {
         TJWATER_MAP_URL: "https://visual-map.invalid/geoserver",
         TJWATER_GEOSERVER_WORKSPACE: "tjwater_next",
         TJWATER_SERVER_API_BASE_URL: "https://tjwater-api.invalid",
-        TJWATER_AGENT_API_BASE_URL: "http://127.0.0.1:8787",
+        TJWATER_AGENT_URL: "http://127.0.0.1:8787",
         TJWATER_ENABLE_DEV_PANEL: "false",
         TJWATER_ENABLE_MSW: "false"
       };`
@@ -248,6 +248,9 @@ async function openWorkbench(page: Page) {
   await page.waitForFunction(() =>
     Boolean(window.__waterNetworkMap?.getLayer("scada-pressure-hit"))
   );
+  await expect(page.getByRole("button", {
+    name: "查看待办与告警，当前 0 条待处理事项"
+  })).toBeVisible();
 }
 
 type BasemapLabel = "浅色" | "影像" | "天地图矢量" | "天地图影像";
@@ -331,6 +334,7 @@ async function expectLoadedChineseFont(page: Page) {
 }
 
 async function expectBodyContrast(page: Page) {
-  const body = page.getByText("直接说出你想调查的问题，我会整理监测与空间证据，并将分析结果带回地图。");
+  const body = page.getByRole("group", { name: "推荐问题" }).getByRole("button").first();
+  await expect(body).toBeVisible();
   expect(await readRenderedContrast(body)).toBeGreaterThanOrEqual(4.5);
 }