Summary
- Implement or migrate MAUI visual handlers.
- USE FOR: handler mappers, type guards, unique mapper keys, renderer-to-handler migration, `ConnectHandler`/`DisconnectHandler`, `PropertyMapper`, `CommandMapper`, custom `ViewHandler`, platform partials, `CreatePlatformView`, `ConfigureMauiHandlers`.
- DO NOT USE FOR: non-visual APIs, full Xamarin migration, native SDK bindings.