Adobe Create ui/: one folder per UI unit —
<name>/{<name>.ts (lazy wrapper), <name>-element.ts (container), <name>-presentation.ts (pure render), <name>.css.ts}.
The element subscribes to state and delegates to the pure presentation; no business logic here.
Comes last. The how is in the auto-loading features/ui/index.md rule (and element.md,
lazy-element.md, presentation.md).