fix(views): accept Linear's open filter when copying a view down

The copy-down reverse-compiler only treated state.type nin [completed, canceled, duplicate] (Pearl's own :open predicate) as open. Linear's UI authors open as nin [completed, canceled], without duplicate, so copying down any standard open-issues view refused with "state.type uses a nin that isn't Pearl's open predicate" and never reached the save.

A nin now maps to :open when every excluded type is a closed type and the set excludes both completed and canceled. That covers Linear's two-type form and Pearl's three-type form. A nin missing one of the two, or one that also excludes an open type like backlog, still refuses.

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