# useMonitorLive 设计

## 目标

抽出 Monitor 直播会话：`live` 状态、`openLive`/`closeLive`/`toggleLive`/`fullscreenLive`、heartbeat、playUrl 刷新与衍生文案。

## 契约

```js
const {
  live,
  livePhaseText,
  canFullscreenLive,
  detailLiveView partial fields OR expose live + helpers,
  toggleLive,
  fullscreenLive,
  closeLive,
  openLive,
} = useMonitorLive({
  getDockId: () => /* 当前直播目标 dockId */,
  ui,
  getLivePlayer: () => detailPanelRef.value?.livePlayerRef,
})
```

页面继续组装 `detailLiveView`（可把 phaseText/canFullscreen/playUrl 从 composable 取）。

## 非目标

- 不改 LivePlayer / API 形状
- 不迁详情面板

## 实现

1. `src/composables/useMonitorLive.js`
2. MonitorView 接线；`onUnmounted` 仍 `closeLive()`
3. Commit: `refactor: 抽取 useMonitorLive 直播会话逻辑`

## 约束

精确 git add；中文 commit