Release v12.0.0.3-rc

Features:

• New "Hide when empty" option: hides a playlist or collection while its rules match no items, and brings it back automatically once items match again
• Round Robin sorting can now group by Collection and control the order of items within each group

Bug Fixes:

• Fixed duplicate smart playlists and collections that could appear after failed deletions; leftover orphans are now detected and cleaned up automatically