Features:

• Use embedded MP3 artwork as thumbnails
  
• Apply thumbnails when MP3 files are imported
• Backfill thumbnails for selected MP3 items
• Backfill thumbnails for all MP3 items in the current library
• Extract duration from MPEG audio frames
• Extract BPM from `TBPM`, `TBP`, `TXXX:BPM`, and `TXXX:Tempo`

Usage:

• `Apply to Selected MP3s`: Updates only the currently selected MP3 items.
• `Apply to All MP3s`: Updates every MP3 item in the current library.

For existing libraries, test `Apply to Selected MP3s` on a few files first. If the result looks correct, run `Apply to All MP3s`.

Limitations:

• Eagle already has native MP3 waveform thumbnails. Import-time format extension behavior may depend on Eagle's internal format priority.
• Already-imported MP3 items may not be refreshed by Eagle's thumbnail refresh command. Use the plugin window backfill actions instead.
• BPM is only available when the source MP3 contains a supported BPM tag.
• Supports common ID3 artwork and metadata patterns.

NOTE:

• If thumbnails appear gray, try restarting Eagle to make them display in color.
• Inspector previews for MP3 files may remain gray due to Eagle's built-in MP3 handling.