The "all" / "preserve" origin scope existed to decide whether returning
from a memo detail should clear the remembered Space. With the Space now
part of the origin URL itself, nothing branches on it any more; it was only
computed, serialized into router state as fromScope, and threaded through
props as parentScope.
Router state is now just { from }, createMemoNavigationState takes one
argument, and resolveMemoDetailOrigin / resolveMemoParentPage return the
origin page as a string. The archived-memo fallback to /archived stays.
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