AntdUI/AntdUI-Demo — reverse-engineered prompt

Build me a Windows desktop demo app in C# that shows off the AntdUI WinForms controls in a clean, polished way. I want it to feel like a real showcase app, with a main window and pages or sections for the different kinds of controls, like buttons, inputs, date and time pickers, tables, tabs, trees, menus, alerts, drawers, notifications, chat style components, and some of the more visual extras like avatar, carousel, timeline, image preview, battery, and signal.

Please include a system settings area where I can switch light and dark mode, or let it follow the Windows theme, and turn animations, shadows, and scrollbars on or off. It should also let me choose where messages and notifications appear. Use sample data and interactions so each control actually demonstrates something useful instead of just sitting there.

Make it runnable in Visual Studio as a WinForms project targeting .NET Framework 4.8, or another compatible Windows target if needed. If anything is unclear, look up the current AntdUI docs online and match the latest demo style closely.