feat: Add chat to editor view and refactor current openning

chat/ChatEditor.hpp

@@ -0,0 +1,39 @@
+// Copyright (C) 2024-2026 Petr Mironychev
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#pragma once
+
+#include <coreplugin/editormanager/ieditor.h>
+
+class QQmlEngine;
+
+namespace QodeAssist::Chat {
+
+class ChatDocument;
+class ChatWidget;
+class SessionFileRegistry;
+
+// Editor-area host for the chat. Each editor (including a split duplicate) owns its own
+// ChatWidget and therefore its own independent chat session.
+class ChatEditor : public Core::IEditor
+{
+    Q_OBJECT
+
+public:
+    ChatEditor(QQmlEngine *engine, SessionFileRegistry *sessionFileRegistry);
+    ~ChatEditor() override;
+
+    Core::IDocument *document() const override;
+    QWidget *toolBar() override;
+    Core::IEditor *duplicate() override;
+
+    void consumePendingChatFile();
+
+private:
+    QQmlEngine *m_engine;
+    SessionFileRegistry *m_sessionFileRegistry;
+    ChatDocument *m_document;
+    ChatWidget *m_chatWidget;
+};
+
+} // namespace QodeAssist::Chat