- Add URL.revokeObjectURL on unmount and media removal in
AdminBroadcastCreate, AdminPinnedMessageCreate, Support
- Track blob URLs via refs to revoke before creating new ones
- Add clearCreateAttachment/clearReplyAttachment helpers in Support
to properly revoke blob URLs when clearing attachments
- Cap adminTraffic cache at 20 entries with FIFO eviction to prevent
unbounded memory growth from different filter combinations