admin panel polish - recording management and attestation review

[AevumDecessus]

Summary

Improve the admin panel for day-to-day management of recordings, attestations, and license tracking.

Requirements

Recording management

• Upload recordings manually (for narrators who record offline)
• Assign recording to book and narrator
• Preview/playback audio from admin
• Delete recordings

Attestation review

• View all submitted attestations
• Filter by book, narrator, date
• Verify completeness (all required fields present)
• Flag recordings missing attestation

License tracking

• Dashboard or list view showing license expiry dates
• Visual indicator for approaching/expired licenses
• Bulk disable playback for expired licenses

Acceptance criteria

• Can upload and assign recordings from admin
• Attestation list view with filters
• Recordings without attestation flagged
• License expiry visible and sortable