Follow-up to the rack-aware pre-print checks: after the blocking checks
pass, warn (without disabling Send) when the plate needs more matching
hotends than the rack printer currently holds - suggesting rack setup,
a nozzle info refresh, or a re-slice to avoid filament waste - or when
the only matches rely on unreliable nozzle information.
Text-only warning rows; this message board has no refresh or
don't-show-again buttons.