What problems was I solving

The Building2Animated icon component in management-ui was no longer referenced anywhere after the sidebar IA restructure (#4069 / ARC-2255), leaving behind dead code and an unused barrel re-export.

What user-facing changes did I ship

No user-facing changes. This is a pure dead-code cleanup that only removes an internally unused animated icon component.

How I implemented it

Deleted architect/management-ui/app/main/components/animated-icons/building-2.tsx and removed its re-export from architect/management-ui/app/main/components/animated-icons/index.tsx; verified via grep that Building2Animated has no remaining call-sites in the codebase.

Description for the changelog

Removed the unused Building2Animated animated icon component and its barrel re-export from the management-ui animated-icons index. This eliminates dead code left over from the accounts sidebar restructure and slightly reduces the management UI bundle.