The mail chat window now manages its next-action text as stored interface data rather than calculating it directly in the header. This is an internal improvement that should make the chat UI easier to maintain without changing the visible workflow for users.

Task-2793280

The VoIP module’s internal file structure was simplified by removing an unnecessary folder level. This makes the codebase easier to maintain without changing the product experience for users.

Remove intermediate directories in `static/src/models/`.