- Added server-side search using searchPlaylists API
- Added filtering: visibility (public/private), owner (all/mine/others)
- Added client-side sorting: by date, title, track count (asc/desc)
- Enhanced filter UI with collapsible filters panel
- Added sort controls with field selector and order toggle
- Integrated search API when search query or filters are active
- Maintained existing bulk operations (delete, share, export)
- Added clear filters button when filters are active
- Improved UX with filter badges and active state indicators
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