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

sources/widgets/CompletionErrorHandler.hpp

@@ -0,0 +1,39 @@
+// 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 <texteditor/basehoverhandler.h>
+#include <QPointer>
+
+namespace QodeAssist {
+
+class ErrorWidget;
+
+class CompletionErrorHandler : public TextEditor::BaseHoverHandler
+{
+public:
+    void showError(
+        TextEditor::TextEditorWidget *widget, 
+        const QString &errorMessage, 
+        int autoHideMs = 5000);
+
+    void hideError();
+
+    bool isErrorVisible() const { return !m_errorWidget.isNull(); }
+
+protected:
+    void identifyMatch(
+        TextEditor::TextEditorWidget *editorWidget, int pos, ReportPriority report) override;
+    void operateTooltip(TextEditor::TextEditorWidget *editorWidget, const QPoint &point) override;
+
+private:
+    QPointer<TextEditor::TextEditorWidget> m_widget;
+    QPointer<ErrorWidget> m_errorWidget;
+    QString m_errorMessage;
+    QPoint m_errorPosition;
+};
+
+} // namespace QodeAssist
+