fix windows window issues

native/src/window_chrome.h

@@ -0,0 +1,9 @@
+#pragma once
+
+#include <napi.h>
+
+// Registers the `windowChrome` export. On Windows it exposes `applyFlatFrame`,
+// which strips the visible native frame/shadow from a frameless WS_THICKFRAME
+// window while preserving native Aero Snap and edge resize. On other platforms
+// it registers a no-op so the JS surface stays uniform.
+void RegisterWindowChrome(Napi::Env env, Napi::Object exports);