fix: 修改直播和监控逻辑

src/hooks/useClassMonitor.ts

@@ -227,12 +227,14 @@ export const syncStudentScreenShareState = async (state: unknown) => {
   }
 
   const sessionKey = getMonitorSessionKey(msg)
-  if (monitorState === 1 && sessionKey && monitorSessionId === sessionKey) {
+
+  // 已在监控中：仅刷新连接参数，不先 stop 再 start（与老师 screenShareState 同步一致）
+  if (monitorState === 1) {
+    if (sessionKey) monitorSessionId = sessionKey
     applyStudentShareStart(msg)
     return
   }
 
-  stopClassMonitor()
   monitorSessionId = sessionKey
   monitorState = 1
   if (!applyStudentShareStart(msg)) {

src/stores/user.ts

@@ -123,7 +123,8 @@ export const userStore = defineStore('user', () => {
       system.value.isLock = info.lockFlag === 0
     }
 
-    if (hasMonitorState) {
+    // 有 studentScreenShareState 时以其为准，避免与旧 monitorState 重复 stop/start
+    if (hasMonitorState && !hasStudentScreenShareState) {
       syncClassMonitorState(info)
     }