🐛 Fix mission timestamp showing creation time instead of last activity

[clubanderson]

Summary

• The mission sidebar list was displaying mission.createdAt as the timestamp for each mission entry
• When a user added a chat message to an older mission, it correctly moved to the top of the list (sorted by updatedAt) but the displayed timestamp still showed the original creation time
• Changed MissionListItem to render mission.updatedAt so the timestamp reflects the most recent activity (message sent, status change, etc.)

Fixes #4078

Test plan

• Open the mission sidebar and start a new mission — timestamp should show the current time
• Send a follow-up message to an older mission — the timestamp should update to the current time and the mission should move to the top of the list
• Verify that completed/failed missions retain their last-updated timestamp

[kubestellar-prow]

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[Copilot]

Pull request overview

Fixes the mission sidebar timestamp display so it reflects the mission’s most recent activity (matching the list’s updatedAt-based ordering), rather than always showing the original creation time.

Changes:

• Updated MissionListItem to render mission.updatedAt instead of mission.createdAt for the displayed timestamp.