Visualizer Sorting Sequence Bug

Address the issue where the visualizer incorrectly shows a new sequence as already sorted after a previous sequence has been sorted. Ensure accurate representation of sorting results.

Start by reproducing the issue in the visualizer: sort one sequence, then load or create a new sequence and inspect its displayed state. Trace the visualizer entry point and state handling for sorting results; done means each new sequence reflects its own unsorted or sorted status rather than retaining the previous sequence's result.

Written by the indexing model from the issue text.