feat(gui): Implement RAG Settings panel in AI Settings

tests/test_rag_gui_presence.py

@@ -0,0 +1,15 @@
+
+import pytest
+from src.gui_2 import App
+
+def test_rag_panel_exists():
+ """Verify that _render_rag_panel has been added to the App class."""
+ assert hasattr(App, '_render_rag_panel')
+ assert callable(App._render_rag_panel)
+
+def test_rag_panel_integration():
+ """Verify that _gui_func calls _render_rag_panel by inspecting source or via mock."""
+ import inspect
+ source = inspect.getsource(App._gui_func)
+ assert "self._render_rag_panel()" in source
+ assert "imgui.collapsing_header(\"RAG Settings\")" in source