- Health check service pings instance URLs, shows status indicators
- Env var editor with add/remove/save (single CapRover API call)
- Activity timeline on instance detail page (from audit log)
- Retry deploy button for failed instances
- Maintenance mode toggle (scale to 0/1 replicas)
- Dark mode via Tailwind + localStorage toggle
- Dashboard: health check all, recent activity feed, total revenue
- Instance list: health dots, failed filter, responsive columns
- Logout button in header
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>