Fix idle session breaking resize and input on reconnect

Two bugs introduced in the idle tracker pause commit:

1. handleOutput() short-circuited entirely when idle, skipping
   connector.OnData() — so terminal output never reached clients
   even after reconnecting. Fix: still call connector.OnData()
   during idle; only skip the expensive tracker.Feed().

2. When a WebSocket client reconnects to an existing session,
   handleWebSocket never called UpdateConnector(), so the idle
   flag was never cleared and the tracker stayed paused. Fix:
   create a fresh connector and call session.UpdateConnector()
   on reconnect, which clears idle and rebuilds the tracker.

webterm/server.go

@@ -515,6 +515,13 @@ func (s *LocalServer) handleWebSocket(w http.ResponseWriter, r *http.Request) {
 		session := s.sessionManager.GetSession(sessionID)
 		if session != nil && session.IsRunning() {
 			sessionCreated = true
+			// Clear idle state so the output pipeline resumes fully
+			connector := &localClientConnector{
+				server:    s,
+				sessionID: sessionID,
+				routeKey:  routeKey,
+			}
+			session.UpdateConnector(connector)
 			replay := daResponsePattern.ReplaceAll(session.GetReplayBuffer(), nil)
 			if len(replay) > 0 {
 				s.enqueueWSFrame(routeKey, websocket.BinaryMessage, replay)