gui: restart agent streams on session resume

When resuming the active session, restart chat stream so user
can continue working without switching agents.

kde/gui/ollie9pclient.cpp

@@ -516,6 +516,10 @@ bool Ollie9pClient::resumeSession(const QString &sessionId)
     QString path = "session/" + sessionId + "/ctl";
     if (m_9p->write(path, "resume")) {
         refreshSessions();
+        // Restart streams if this is the active session
+        if (sessionId == m_activeSessionId && !m_agentId.isEmpty()) {
+            startActiveAgentStreams();
+        }
         return true;
     }
     return false;