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

sources/UIControls/qml/QoASeparator.qml

@@ -0,0 +1,13 @@
+// Copyright (C) 2025-2026 Petr Mironychev
+// SPDX-License-Identifier: GPL-3.0-or-later
+// Additional attribution terms under GPLv3 §7(b) apply — see LICENSE
+
+import QtQuick
+
+Rectangle {
+    id: root
+
+    height: 15
+    width: 1
+    color: palette.mid
+}