After a collection-type change, snap playbackOrder to the new type's first
offered order when the current one is no longer valid (e.g. Collection+Marathon
-> TelevisionShow left a stale 'Marathon' while the native <select> displayed
'Chronological' and Marathon fields stayed visible), and reconcile multipleMode
into the valid set for the new (type, order) state (e.g. CollectionSize
surviving a switch into Playlist). Replaces the narrow MultiCollection/Playlist
special-cases with a general invariant. Adds repro + a from/to-pair invariant
test; updates the Playlist multipleMode test to the corrected behavior.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
timothyandClaude Fable 5
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