- Poller now stores _instanceKey alongside _instanceUrl on Sonarr/Radarr queue records
- dashboard route threads arrQueueId/arrType/arrInstanceUrl/arrInstanceKey/arrContentId/arrContentType as admin-only fields on downloads with importIssues
- POST /api/dashboard/blocklist-search: admin-only, removes queue item with blocklist=true then triggers EpisodeSearch/MoviesSearch
- Button renders in download card header (admin + importIssues + arrQueueId only)
- Confirm dialog, loading/success/error states on the button
- Kicks a background poll on success so SSE reflects removed item promptly