feat(bigscreen): 任务展示页 + 暂时关闭语音对话页 + 导航/文档同步

- App.jsx 移除 /voice、新增 /tasks→TaskDisplay。
- pageNav PAGE_ORDER 移除 voice、加 tasks(方向键/页眉/MQTT navigate_rel 自动跟随)。
- useMqttControl：PAGE_ALIAS 加 tasks；移除 voice_*、改 task_refresh。
- PageHeader STATUS_BY_PATH 加 /tasks。
- 新增 TaskDisplay.jsx + task-display.css：轮播卡(分类/状态/标题/摘要/标签/预算/任务ID+QRCodeSVG 扫码接单)、useTasks 轮询 /park/api/tasks、接受 MQTT task_refresh。
- 新增 utils/taskData.js(useTasks, tenantFetch 带租户身份)。
- docs/mqtt-commands.md：navigate 列表/语音章节标注语音页关闭、tasks 页指令。

Co-Authored-By: Claude <noreply@anthropic.com>

src/utils/useMqttControl.js

@@ -1,8 +1,8 @@
 import { useEffect } from 'react';
 import { useNavigate, useLocation } from 'react-router-dom';
 import { onMqttMessage, connectMqtt, publishMqtt, getClientId, useMqttStatus } from './mqtt';
-import { MQTT_TOPIC_HEARTBEAT, MQTT_TOPIC_COMMAND, getApiBase as API_BASE } from '../config';
-import { getTenantId } from './tenant';
+import { MQTT_TOPIC_HEARTBEAT, MQTT_TOPIC_COMMAND, MQTT_TOPIC_BIND, getApiBase as API_BASE } from '../config';
+import { getTenantId, clearBinding } from './tenant';
 import { Sfx } from './sounds';
 import { PAGE_ORDER } from './pageNav';
 import { aiStatus } from './statusBus';
@@ -31,6 +31,7 @@ const PAGE_ALIAS = {
   home: '/', '数据大屏': '/', '首页': '/',
   twin: '/twin', '数字孪生': '/twin', '3d': '/twin',
   ai: '/ai', 'ai助手': '/ai',
+  tasks: '/tasks', '任务展示': '/tasks', task: '/tasks',
   screen: '/screen', '媒体轮播': '/screen', media: '/screen',
   wall: '/wall', '企业展示墙': '/wall', '企业墙': '/wall', '展示墙': '/wall',
 };
@@ -61,6 +62,19 @@ export function useMqttControl() {
     }).catch(() => {});
   }, [mqttStatus]);
 
+  // 后端主动解绑：监听绑定频道，收到 unbound 事件 → 清理本地绑定并退出到待绑定页
+  // （大屏已绑定后仍订阅 bind/<clientId>，见 mqtt.js subscribe；unbind 后 main.jsx 见
+  //   isDeviceBound()=false 渲染 BindScreen）
+  useEffect(() => {
+    connectMqtt();
+    const off = onMqttMessage((topic, data) => {
+      if (topic === `${MQTT_TOPIC_BIND}/${getClientId()}` && data && data.event === 'unbound') {
+        clearBinding();
+      }
+    });
+    return off;
+  }, []);
+
   // 大屏在线心跳（后端据此统计在线大屏数）
   useEffect(() => {
     connectMqtt();
@@ -170,19 +184,10 @@ export function useMqttControl() {
           }));
           break;
 
-        // ── 语音对话页操作 ──
-        case 'voice_start':
-          // admin 主动问候测试：携带 text；若不在 /voice 页先跳转，文本暂存 sessionStorage
-          if (cmd.params?.text) sessionStorage.setItem('dpm_voice_greet', cmd.params.text);
-          if (location.pathname !== '/voice') navigate('/voice');
-          window.dispatchEvent(new CustomEvent('dpm:voice-control', {
-            detail: { action: 'start', text: cmd.params?.text || '' },
-          }));
-          break;
-        case 'voice_stop':
-        case 'voice_refresh':
-          window.dispatchEvent(new CustomEvent('dpm:voice-control', {
-            detail: { action: cmd.action.replace('voice_', '') },
+        // ── 任务展示页操作（语音页已暂时关闭，voice_* 指令不再处理） ──
+        case 'task_refresh':
+          window.dispatchEvent(new CustomEvent('dpm:task-control', {
+            detail: { action: 'refresh', ...(cmd.params || {}) },
           }));
           break;