feat: Add session layout

sources/Session/SessionManager.hpp

@@ -0,0 +1,52 @@
+// Copyright (C) 2024-2026 Petr Mironychev
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#pragma once
+
+#include <QList>
+#include <QObject>
+#include <QPointer>
+#include <QString>
+
+namespace QodeAssist {
+
+class AgentFactory;
+class ConversationHistory;
+class Session;
+
+class SessionManager : public QObject
+{
+    Q_OBJECT
+    Q_DISABLE_COPY_MOVE(SessionManager)
+public:
+    explicit SessionManager(QObject *parent = nullptr);
+
+    SessionManager(AgentFactory *agentFactory, QObject *parent = nullptr);
+
+    ~SessionManager() override;
+
+    Session *createSession();
+
+    Session *createSession(const QString &agentName, QString *errorOut = nullptr);
+
+    Session *createSession(
+        const QString &agentName,
+        ConversationHistory *externalHistory,
+        QString *errorOut = nullptr);
+
+    void removeSession(Session *session);
+
+    QList<Session *> sessions() const;
+
+    void cancelAll();
+
+signals:
+    void sessionCreated(Session *session);
+    void sessionRemoved(Session *session);
+
+private:
+    QPointer<AgentFactory> m_agentFactory;
+    QList<QPointer<Session>> m_sessions;
+};
+
+} // namespace QodeAssist