- RelationManager renders create/link/delete/unlink in declared order with
one primary, opens the child modal (update or view form) or the pivot
modal on row click, and deletes selected children behind a busy confirm
- RelationChildModal creates and edits children with its own session key
(X-Child-Session-Key) so uploads and dates work inside it
- RelationPivotModal edits link details; the picker links one record with
its pivot values when the relation has a pivot form
- deferrable managers render on the create screen with owner id 0, the
form's X-Session-Key and the pending note, and mark the form dirty
- the registry resolves RelationManager lazily (child forms close an
import cycle); DataTable gains openable rows and a trailing cell
- relation lang keys in en and pl; rebuilt boardwalk dist
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