Describe the bug
In the workflow Versions panel, every revision shows the same timestamp (the time of the most recent save). Older revisions’ times are overwritten to match the newest revision, making the history misleading.

To Reproduce
Steps to reproduce the behavior:

1. Go to a workflow in Keep.
2. Make an edit and Save (creates Revision A).
3. Make another edit and Save (creates Revision B).
4. Open Versions in the right sidebar.
5. Observe that Revision A and Revision B display the same timestamp (the latest save time).
6. Repeat another save and see older entries’ timestamps update again.

Expected behavior
Each revision should display its own immutable creation timestamp (when that snapshot was taken). Creating a new revision must not change timestamps on earlier revisions. Sorting by time should reflect true chronological order.