Preserve GetCursorPos error reporting

Mark the P/Invoke as SetLastError-aware so failed cursor queries report the correct Win32 error.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: DinahK-2SO

test/e2e/ItE2E/Public/Ui.ps1

@@ -51,7 +51,7 @@ function Initialize-WtWin32Input {
     [DllImport("user32.dll")] public static extern bool IsIconic(IntPtr hWnd);
     [DllImport("user32.dll")] public static extern bool AllowSetForegroundWindow(uint dwProcessId);
     [DllImport("user32.dll")] public static extern uint GetWindowThreadProcessId(IntPtr hWnd, out uint pid);
-    [DllImport("user32.dll")] public static extern bool GetCursorPos(out POINT point);
+    [DllImport("user32.dll", SetLastError=true)] public static extern bool GetCursorPos(out POINT point);
     [DllImport("user32.dll")] public static extern bool SetCursorPos(int x, int y);
     [DllImport("user32.dll")] public static extern short GetAsyncKeyState(int virtualKey);
     [DllImport("user32.dll", SetLastError=true)] public static extern uint SendInput(uint count, INPUT[] inputs, int size);