Given a list of integers, sort the elements by their frequency in descending order (most frequent first). If two elements have the same frequency, sort them by value in ascending order. Return a list of unique elements in this sorted order.
Examples:
Input: numbers = [1, 1, 2, 2, 2, 3]
Output: [2, 1, 3]
Explanation: 2 appears 3 times, 1 appears 2 times, 3 appears 1 time
Input: numbers = [4, 4, 5, 5]
Output: [4, 5]
Explanation: Both appear 2 times, sorted by value (4 before 5)
Input: numbers = [7]
Output: [7]
Explanation: Single element list returns the element
Input: numbers = []
Output: []
Explanation: Empty list returns empty list
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