Time-series Table: sorting always based on first column in v6.0.0

Bug description

Summary

In Superset 6.0.0, the Time-series Table visualization always sorts rows based on the first column, regardless of which column header is clicked. This prevents proper sorting on time series columns.

Steps to Reproduce

1. Create or open a Time-series Table chart.
2. Click on the header of a time series column to sort it.
3. Observe the sorting behavior.

Expected Behavior

• Clicking on a time series column should sort rows numerically (ascending/descending) based on that column's values.
• Clicking on the dimension column (first column) should sort rows alphabetically based on the dimension's values.

Screenshots/recordings

https://github.com/user-attachments/assets/1d095b22-18bc-46ae-a73c-7aa4f9ebd538

Superset version

6.0.0

Python version

3.11

Node version

I don't know

Browser

Chrome

Additional context

No response

Checklist

• I have searched Superset docs and Slack and didn't find a solution to my problem.
• I have searched the GitHub issue tracker and didn't find a similar bug report.
• I have checked Superset's logs for errors and if I found a relevant Python stacktrace, I included it here as text in the "additional context" section.