Add file context menu actions to the Agent Sessions Changes view

When reviewing a session in the Agent Sessions sidebar, the **Changes** list shows the files modified by the agent, but right-clicking a file does not provide the familiar file actions available from the Source Control Changes view.

Please add the applicable SCM file context-menu actions to files in this view, especially **Discard Changes** (or an equivalent **Revert Changes** action).

This would make it possible to revert one agent-modified file directly from the session where the changes are being reviewed. Currently, it is difficult to discover how to undo a single file from the Agent Sessions window; the user must leave that view and find the file elsewhere.