Allow editing queued message by pressing up in an empty editor (#58807)

Release Notes:

- Pressing up in an empty agent message editor now brings back the last
queued message for editing if there is one
67427ffbc6Lukas Wirth committed on 6/12/2026, 7:45:18 AM· committed by GitHubparentfef979d
2 files changedLine totals unavailable