gardener: "Purge unavailable…" button label reads as "purge is unavailable"

[genwave-radio]

🐛 Symptom

The first real operator to see the dead-files section read the button "Purge unavailable…" as a status ("purging is unavailable") and went looking for what disabled it — guessed the FileActions compose overlay. It is a verb phrase: "purge the unavailable tracks."

🔎 Facts

• It is gh-Need a way to purge orphaned/removed track records #113's catalog purge reused (admin-ui/app/(authed)/_components/PurgeUnavailableAction.tsx, shared at T378 review MED-2): dry-run count → confirm dialog → deletes DB rows unavailable >7 days, ratings/rotation/findings via cascade. Never touches files; unrelated to FileActions or /media:ro.
• GardenerSection.tsx:57 passes title="Purge unavailable" / triggerLabel="Purge unavailable…"; the catalog call site has its own copy ("Purge hidden tracks…") — the label props are the only thing to change.

🔧 Fix direction

Verb-first copy that names the object, e.g. "Purge dead tracks…" — or name the live count once fetched. Copy-only change at the two call-site props; Dean's capitals rule applies.

[genwave-radio]

Fixed in #659 (T387): the trigger now reads "Purge dead tracks…" on the Gardener's dead-files tab — verb-object, no status reading. Ships in v5.5.1.