refactor(lib): move songToTrack + pure server-scope helpers to lib/media; split trackServerScope

songToTrack (the canonical Subsonic-song -> Track mapper) and the pure
server-scope helpers (activeServerProfileId, stampTrackServerId/s,
isMultiServerQueue, profileIdFromQueueRef) operate only on the lib/media model +
authStore + server-key utils -- no playback-store read. Move them to lib/media so
the ~58 app-wide consumers (cover, context menus, sharing, lucky-mix, library
browse, pages, hooks) depend on lib, not on the playback feature.

trackServerScope is split: the store-reading queue helpers (queueItemRefAt,
filterQueueRefs*, activeServerQueueTrackIds) stay in
features/playback/utils/playback/trackServerScope and build on the pure lib half.

With Track/QueueItemRef (prior commit), songToTrack and shuffleArray now in lib,
the media-domain model is fully out of features/playback. The remaining
playerStoreTypes imports are PlayerState only (the store shape). tsc 0, lint 0,
full suite 2353/2353, build OK.

src/features/playlist/components/PlaylistSongSearchPanel.tsx

@@ -3,7 +3,7 @@ import { useTranslation } from 'react-i18next';
 import { Check, ListPlus, X } from 'lucide-react';
 import type { SubsonicSong } from '@/lib/api/subsonicTypes';
 import { usePlayerStore } from '@/features/playback/store/playerStore';
-import { songToTrack } from '@/features/playback/utils/playback/songToTrack';
+import { songToTrack } from '@/lib/media/songToTrack';
 import { formatTrackTime } from '@/lib/format/formatDuration';
 import { AlbumCoverArtImage } from '@/cover/AlbumCoverArtImage';
 import { COVER_DENSE_SEARCH_CSS_PX } from '@/cover/layoutSizes';

src/features/playlist/components/PlaylistSuggestions.tsx

@@ -10,7 +10,7 @@ import StarRating from '@/components/StarRating';
 import { PlaylistArtistCell } from '@/features/playlist/components/PlaylistArtistCell';
 import { useThemeStore } from '@/store/themeStore';
 import { usePlaylistLayoutStore } from '@/features/playlist/store/playlistLayoutStore';
-import { songToTrack } from '@/features/playback/utils/playback/songToTrack';
+import { songToTrack } from '@/lib/media/songToTrack';
 import { getQueueTracksView } from '@/features/playback/store/queueTrackView';
 import { codecLabel } from '@/utils/componentHelpers/playlistDetailHelpers';
 import { formatLastSeen } from '@/utils/componentHelpers/userMgmtHelpers';

src/features/playlist/components/PlaylistTracklist.tsx

@@ -17,7 +17,7 @@ import { previewInputFromSong, usePreviewStore } from '@/features/playback/store
 import { useThemeStore } from '@/store/themeStore';
 import { useDragDrop } from '@/lib/dnd/DragDropContext';
 import { useOrbitSongRowBehavior } from '@/features/orbit';
-import { songToTrack } from '@/features/playback/utils/playback/songToTrack';
+import { songToTrack } from '@/lib/media/songToTrack';
 import type { PlaylistSortKey, PlaylistSortDir } from '@/features/playlist/utils/playlistDisplayedSongs';
 import { AddToPlaylistSubmenu } from '@/components/ContextMenu';
 

src/features/playlist/hooks/usePlaylistDerived.ts

@@ -2,7 +2,7 @@ import { useMemo } from 'react';
 import type { SubsonicSong } from '@/lib/api/subsonicTypes';
 import type { Track } from '@/lib/media/trackTypes';
 import { usePlayerStore } from '@/features/playback/store/playerStore';
-import { songToTrack } from '@/features/playback/utils/playback/songToTrack';
+import { songToTrack } from '@/lib/media/songToTrack';
 import { getDisplayedSongs, type PlaylistSortDir, type PlaylistSortKey } from '@/features/playlist/utils/playlistDisplayedSongs';
 
 export interface PlaylistDerivedOptions {

src/features/playlist/pages/Playlists.tsx

@@ -2,7 +2,7 @@ import { resolveMediaServerId, resolvePlaylist } from '@/features/offline';
 import { getGenres } from '@/lib/api/subsonicGenres';
 import { filterSongsToActiveLibrary } from '@/lib/api/subsonicLibrary';
 import type { SubsonicPlaylist, SubsonicGenre } from '@/lib/api/subsonicTypes';
-import { songToTrack } from '@/features/playback/utils/playback/songToTrack';
+import { songToTrack } from '@/lib/media/songToTrack';
 import React, { useEffect, useState, useRef, useCallback } from 'react';
 import { usePlayerStore } from '@/features/playback/store/playerStore';
 import { usePlaylistStore } from '@/features/playlist/store/playlistStore';

src/features/playlist/utils/playPlaylistById.ts

@@ -1,5 +1,5 @@
 import { getPlaylist } from '@/lib/api/subsonicPlaylists';
-import { songToTrack } from '@/features/playback/utils/playback/songToTrack';
+import { songToTrack } from '@/lib/media/songToTrack';
 import { usePlayerStore } from '@/features/playback/store/playerStore';
 import { playPlaylistAll } from '@/features/playlist/utils/playlistBulkPlayActions';
 

src/features/playlist/utils/startPlaylistRowDrag.ts

@@ -1,6 +1,6 @@
 import type React from 'react';
 import type { SubsonicSong } from '@/lib/api/subsonicTypes';
-import { songToTrack } from '@/features/playback/utils/playback/songToTrack';
+import { songToTrack } from '@/lib/media/songToTrack';
 
 export interface StartPlaylistRowDragDeps {
   e: React.MouseEvent;