Return a new list that rotates the input integers to the right by the requested number of steps. Do not modify the original list. Treat the step count as non-negative and normalize values larger than the list size. Return null when the input list is null.

Examples:

List<Integer> values = new List<Integer>{ 1, 2, 3, 4, 5 };
List<Integer> rotated = rotateRight(values, 2);
// Results: [4, 5, 1, 2, 3]

List<Integer> same = rotateRight(values, 5);
// Results: [1, 2, 3, 4, 5]
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