[feature]: Undo actions with Cmd/Ctrl+Z

Is there an existing issue for this?

• I have searched the existing issues

Summary

Allow undoing the last action on a work item (state change, deletion, assignment, drag & drop…) with Cmd/Ctrl+Z and an "Undo" button in the toast.
Today Cmd/Ctrl+Z only works for text in the editor. Elsewhere, the browser's text undo runs instead and does something unexpected.

Why should this be worked on?

Mistakes are frequent. Today they have to be fixed by hand, and a deleted work item can't be recovered at all.

• Wrong state set (dropdown, s shortcut, Kanban drag & drop)
• Wrong priority, assignee, label or date
• Work item moved to the wrong cycle or module
• Work item deleted or archived by mistake
• Comment or link deleted by mistake
• "Mark all as read" clicked by mistake

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