- Create reusable UrlEditPopover component with fixed positioning
- Add createUrlEditState hook for managing editing state
- Update DockerHostSummaryTable to use new popover
- Update DockerUnifiedTable (containers & services) to use new popover
- Update GuestRow (Proxmox VMs/containers) to use new popover
- Update HostsOverview (Proxmox hosts) to use new popover
- Add Docker host metadata API for custom URLs
- Consistent styling with save, delete, cancel buttons and keyboard shortcuts