新增对话历史面板

src/ui/ChatHistoryPanel.h

@@ -0,0 +1,37 @@
+#pragma once
+
+#include "../ai/LLMTypes.h"
+
+#include <QDialog>
+#include <QPoint>
+#include <QRect>
+#include <QVector>
+
+class QEvent;
+class QTextEdit;
+
+class ChatHistoryPanel : public QDialog
+{
+public:
+    explicit ChatHistoryPanel(QWidget *parent = nullptr);
+    ~ChatHistoryPanel() override;
+
+    void setMessages(const QVector<ChatMessage> &messages);
+    void showAt(const QPoint &anchorPosition);
+    void showNear(const QRect &avoidRect);
+
+protected:
+    bool event(QEvent *event) override;
+    bool eventFilter(QObject *watched, QEvent *event) override;
+
+private:
+    bool isOwnObject(QObject *object) const;
+    QRect availableGeometryForPoint(const QPoint &point) const;
+    QRect availableGeometryForRect(const QRect &rect) const;
+    QPoint constrainedTopLeft(const QPoint &preferredTopLeft, const QRect &availableGeometry) const;
+    QPoint smartTopLeftNear(const QRect &avoidRect) const;
+    void updateContent();
+
+    QTextEdit *m_textEdit;
+    QVector<ChatMessage> m_messages;
+};