fix(teamsbot): reuse existing SSE queue in joinMeeting to prevent stale reference

Co-authored-by: Cursor <cursoragent@cursor.com>

modules/features/teamsbot/service.py

@@ -716,7 +716,9 @@ class TeamsbotService:
 
         interface = interfaceDb.getInterface(self.currentUser, self.mandateId, self.instanceId)
 
-        # Initialize SSE event queue
+        # Reuse existing SSE event queue if a consumer (SSE generator) already
+        # holds a reference; replacing it would strand the SSE stream.
+        if sessionId not in sessionEvents:
             sessionEvents[sessionId] = asyncio.Queue()
 
         try: