Improve Undo hotkey in Workspace

[#1]

When the Undo hotkey is pressed inside the description area of any Workspace visualisations or in the Text visualisation, the last action in Workspace gets undone instead of the last text entry.

Consider a scenario: a user is typing in a description for a panel. It may be a few paragraphs of text. And then they make a typo, presses Cmd+Z to undo the last text entry, but instead the whole description block disappears as it was the last action in Workspace (description addition/ change action).

Make the Undo function work as in the text processor when it's pressed in the description/ text area.