refactor: Restructure project into sources/tests layout and dissolve PluginLLMCore

sources/widgets/ErrorWidget.hpp

@@ -0,0 +1,50 @@
+// Copyright (C) 2025-2026 Petr Mironychev
+// SPDX-License-Identifier: GPL-3.0-or-later
+// Additional attribution terms under GPLv3 §7(b) apply — see LICENSE
+
+#pragma once
+
+#include <QPainter>
+#include <QTimer>
+#include <QWidget>
+
+#include <utils/theme/theme.h>
+
+namespace QodeAssist {
+
+class ErrorWidget : public QWidget
+{
+    Q_OBJECT
+public:
+    explicit ErrorWidget(const QString &errorMessage, QWidget *parent = nullptr, int autoHideMs = 5000);
+    ~ErrorWidget();
+
+    void setErrorMessage(const QString &message);
+
+    QString errorMessage() const { return m_errorMessage; }
+
+signals:
+    void dismissed();
+
+protected:
+    void paintEvent(QPaintEvent *) override;
+    void mousePressEvent(QMouseEvent *event) override;
+    void enterEvent(QEnterEvent *event) override;
+    void leaveEvent(QEvent *event) override;
+
+private:
+    QString m_errorMessage;
+    QTimer *m_autoHideTimer;
+    QColor m_textColor;
+    QColor m_backgroundColor;
+    QColor m_errorColor;
+    QPixmap m_errorIcon;
+    bool m_isHovered;
+    
+    void setupColors();
+    void setupIcon();
+    QSize calculateSize() const;
+};
+
+} // namespace QodeAssist
+