Handle abrupt WebSocket disconnect (e.g. Safari tab close)

Catch ConnectionClosed in User.send() and handler_recv() so that an
unclean client disconnect no longer produces "Task exception was never
retrieved" / "connection handler failed" log noise.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SH2D4LRuCnhLSzoYerAfJX

ws/user.py

@@ -1,5 +1,6 @@
 import dpath.util as dp
 import json
+import websockets.exceptions
 
 
 def update(d, u, only_existing=True):
@@ -26,7 +27,10 @@ class User:
 			msg = dp.search(data, path)
 			result.update(msg)
 		if len(result) != 0:
-			await self.socket.send(json.dumps(result))
+			try:
+				await self.socket.send(json.dumps(result))
+			except websockets.exceptions.ConnectionClosed:
+				pass
 
 	async def process(self, data):
 		handled = True