Serialise PMPrintSettings/PMPageFormat to XML data plus a plist-safe
NSPrintInfo dictionary snapshot (PrintTicket), restore via
PM*CreateWithDataRepresentation -> PMCopy* -> PMSessionValidate* ->
updateFromPM*, and refuse cross-queue replay (R3).
PrintPanelService.showProperties now returns PanelCaptureResult; the
view model stores tickets in capturedTickets keyed by queue.
Also fixes a latent over-release: PMSessionGetCurrentPrinter hands back
the session's own printer (borrowed) — the extracted currentPrinterID
was PMRelease-ing it, which dangled the session and crashed AppKit's
_printerInPrintSession path and session teardown.