## Summary
Removed the informational "Use Legacy UI" tag from the ManagerHeader
component while preserving all underlying legacy manager functionality.
## Changes
- **What**: Removed Tag component displaying legacy UI information from
ManagerHeader
- **Breaking**: None - all legacy manager functionality remains intact
- **Dependencies**: None
## Review Focus
Visual cleanup only - the `--enable-manager-legacy-ui` CLI flag and all
related functionality continues to work normally. Only the informational
UI tag has been removed from the header.