SnS layout structure is layered. Generic shell behavior starts in DataMine.Framework, SnS adds domain-specific layout behavior, and host applications compose the final application shell.

• DataMine layouts provide reusable frame, shell, and navigation primitives.
• SnsLayout provides shared SnS shell behavior and early state initialization.
• Host layouts such as admin layouts compose application-specific chrome and services.
• Feature layouts initialize feature state and frame specialized workflows.

Layouts should coordinate structure and state readiness, not own detailed domain behavior. Feature logic belongs in services, state classes, and focused components.