feat(ui): Integrate imgui_markdown and professional fonts for rich text rendering

src/app_controller.py

@@ -799,6 +799,7 @@ class AppController:
    "Tool Calls": False,
    "Theme": True,
    "Log Management": False,
+   "Markdown Test": False,
   }
   saved = self.config.get("gui", {}).get("show_windows", {})
   self.show_windows = {k: saved.get(k, v) for k, v in _default_windows.items()}