change "0001-01-01T00:00:00Z" to "---" in lk agent list

[andrewnitu]

┌─────────────────┬─────────┬─────────┬──────────────────────┐
│ ID              │ Regions │ Version │ Deployed At          │
├─────────────────┼─────────┼─────────┼──────────────────────┤
│ CA_VFF8xmxfDmrf │ us-west │ ---     │ 0001-01-01T00:00:00Z │
│ CA_yR89qxXd3KKX │ us-west │ ---     │ 0001-01-01T00:00:00Z │
└─────────────────┴─────────┴─────────┴──────────────────────┘

to

┌─────────────────┬───────────────┬─────────┬─────────────┬──────────────┬──────────────────────┐
│ ID              │ Dispatch Name │ Regions │ Deployments │ Version      │ Deployed At          │
├─────────────────┼───────────────┼─────────┼─────────────┼──────────────┼──────────────────────┤
│ CA_yR89qxXd3KKX │ my-agent      │ us-west │ production  │ zRpGT95NLGAT │ 2026-08-14T15:52:18Z │
│ CA_VFF8xmxfDmrf │               │ us-west │ production  │ ---          │ never deployed       │
└─────────────────┴───────────────┴─────────┴─────────────┴──────────────┴──────────────────────┘

[yoonsio]

LGTM but would --- be more consistent?

[andrewnitu]

@yoonsio actually good point. i will change it