refactor: Decoupling chat architecture (#367)

* refactor: Migrate tests to Qt Creator plugin framework and update llmqore transports

* refactor: Move conversation history into IDE-free session library

* refactor: Extract turn context assembly behind injected ports

* build: Add RunQodeAssistTests target for the plugin test suite

* refactor: Route the chat through a Session and ChatBackend seam

sources/ChatView/ChatHistoryBridge.hpp

@@ -0,0 +1,37 @@
+// Copyright (C) 2026 Petr Mironychev
+// SPDX-License-Identifier: GPL-3.0-or-later
+// Additional attribution terms under GPLv3 §7(b) apply — see LICENSE
+
+#pragma once
+
+#include <QList>
+#include <QObject>
+#include <QPointer>
+
+#include "session/HistoryProjection.hpp"
+
+namespace QodeAssist::Session {
+class Session;
+}
+
+namespace QodeAssist::Chat {
+
+class ChatModel;
+
+class ChatHistoryBridge : public QObject
+{
+    Q_OBJECT
+
+public:
+    ChatHistoryBridge(Session::Session *session, ChatModel *model, QObject *parent = nullptr);
+
+private:
+    void onRowsReset(const QList<Session::MessageRow> &rows);
+    void onRowsAppended(const QList<Session::MessageRow> &rows);
+    void onRowUpdated(int index, const Session::MessageRow &row);
+    void onRowsRemoved(int first, int count);
+
+    QPointer<ChatModel> m_model;
+};
+
+} // namespace QodeAssist::Chat