refactor(quick-17): simplify playlist-view to navigate instead of expand
- Plain click now navigates to playlist-details subpage instead of toggling expand/collapse - Removed all inline track expansion: renderPlaylistBody, track-item rendering, chevron icons - Removed SelectionController, ContextMenuController, PlayerController (track-level interactions moved to playlist-details) - Removed track-info, track-details, phantom-resolver imports (all live in playlist-details now) - Simplified search to filter by playlist name only (no inline track search) - Kept: playlist list, context menu (rename/delete/set-default), Ctrl/Shift multi-select, drag-drop target, create/import, sort toolbar
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