port: GrpDevice verbatim 40250 (Create over the recording device, declaration vertex shaders -> stream-0 FVF)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/platform/EterLib/GrpScreen.cpp

@@ -727,10 +727,8 @@ void CScreen::End()
 	STATEMANAGER.EndScene();
 }
 
-// PORT: 40250 declares these extern (UserInterface, the in-game web page); PythonApplicationWebPage is
-// DIVERGENT here, so the page is never open and Show presents the whole back buffer.
-static const bool g_isBrowserMode = false;
-static RECT g_rcBrowser = {};
+extern bool g_isBrowserMode;
+extern RECT g_rcBrowser;
 
 void CScreen::Show(HWND hWnd)
 {