feat: dispatch session_close on close

redel/app.py

@@ -321,6 +321,8 @@ async def create_title_listener(self, event):
 
     async def close(self):
         """Clean up all the app resources."""
+        self.dispatch(events.SessionClose(session_id=self.session_id))
+        await self.drain()
         if self.dispatch_task is not None:
             self.dispatch_task.cancel()
         await asyncio.gather(

redel/events.py

@@ -101,6 +101,15 @@ class RoundComplete(BaseEvent):
     session_id: str
 
 
+class SessionClose(BaseEvent):
+    """The ReDel session is closing and clients should be redirected to the home page."""
+
+    __log_event__ = False
+
+    type: Literal["kani_message"] = "session_close"
+    session_id: str
+
+
 # user events
 class SendMessage(BaseEvent):
     type: Literal["send_message"] = "send_message"