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cb858edd34
Two changes to a server-side playlist could overlap: the second planned its write from the snapshot the first had already invalidated, and on Piped — where a row is a position — its preflight then passed over whatever had shifted into the slot. Mutations now hold a per-playlist queue from the write to the end of the refetch that reconciles it. Creation queues on the account's list instead: it depends on no playlist's contents, and one queue per account would only make unrelated changes wait. The playlist detail view kept the authenticated snapshot in its own state, so signing in as somebody else — or a change of Apple account — left the previous login's rows, title and destructive affordances on screen. It now discards them the moment either lands and loads again, which re-resolves ownership and falls back to the public endpoint. Also documents two residuals rather than pretending to close them: equal rows are indistinguishable to a positional API, so verify-before-remove cannot protect a particular occurrence of a repeated video; and the credential recheck is a fence, not a lock, because Keychain state cannot be made atomic with a remote send.