feat(quick-17): create playlist-details subpage component
- New playlist-details component with header (back button, playlist icon, title, track count) - Full track list with all interactions: select, play, context menu, drag, phantom handling - Drop target support for adding tracks from other views - Search filtering for tracks within the detail view - Navigation routing in index.ts for playlist-details view - Added playlist-details to SEARCHABLE_VIEWS in search-store
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