refactor(api): F.49 — extract library + artists + ratings (#614)

Three domain-eng modules peel ~316 LOC of fetch/mapping out of
`api/subsonic.ts`:

- `subsonicLibrary.ts` — browse + random + per-song fetch
  (`getMusicDirectory`, `getMusicIndexes`, `getMusicFolders`,
  `getRandomAlbums`, `getAlbumList`, `getRandomSongs`,
  `getRandomSongsFiltered`, `getSong`, `getAlbum`,
  `filterSongsToActiveLibrary`, `similarSongsRequestCount`, plus
  the private `albumIdsInActiveLibraryScope` cache).
- `subsonicArtists.ts` — artist endpoints (`getArtists`, `getArtist`,
  `getArtistInfo`, `getTopSongs`, `getSimilarSongs2`,
  `getSimilarSongs`). Uses Library's `filterSongsToActiveLibrary` and
  `similarSongsRequestCount` for the per-library scoping fallback.
- `subsonicRatings.ts` — `parseSubsonicEntityStarRating` parser plus
  `prefetchArtistUserRatings` and `prefetchAlbumUserRatings` workers
  with the shared 7-min cache. Calls back into Library/Artists for
  the per-id fetch.

51 external call sites migrated to direct imports. No re-export
shims in `subsonic.ts`. Statistics endpoints still in `subsonic.ts`
keep their `RATING_CACHE_TTL` constant locally (same 7-min window).

subsonic.ts: 1078 → 762 LOC (−316).

src/components/AlbumCard.tsx

@@ -1,10 +1,11 @@
+import { getAlbum } from '../api/subsonicLibrary';
 import type { SubsonicAlbum } from '../api/subsonicTypes';
 import { songToTrack } from '../utils/songToTrack';
 import React, { memo, useMemo } from 'react';
 import { useNavigate } from 'react-router-dom';
 import { Play, ListPlus, HardDriveDownload, Check } from 'lucide-react';
 import { useTranslation } from 'react-i18next';
-import { buildCoverArtUrl, coverArtCacheKey, getAlbum } from '../api/subsonic';
+import { buildCoverArtUrl, coverArtCacheKey } from '../api/subsonic';
 import { usePlayerStore } from '../store/playerStore';
 import { useOfflineStore } from '../store/offlineStore';
 import { useAuthStore } from '../store/authStore';

src/components/BecauseYouLikeRail.tsx

@@ -1,10 +1,12 @@
+import { getArtist, getArtistInfo } from '../api/subsonicArtists';
+import { getAlbum } from '../api/subsonicLibrary';
 import type { SubsonicAlbum } from '../api/subsonicTypes';
 import { songToTrack } from '../utils/songToTrack';
 import React, { memo, useEffect, useMemo, useRef, useState } from 'react';
 import { useNavigate } from 'react-router-dom';
 import { useTranslation } from 'react-i18next';
 import { Play, ListPlus, Music } from 'lucide-react';
-import { buildCoverArtUrl, coverArtCacheKey, getAlbum, getArtist, getArtistInfo } from '../api/subsonic';
+import { buildCoverArtUrl, coverArtCacheKey } from '../api/subsonic';
 import CachedImage, { useCachedUrl } from './CachedImage';
 import { usePlayerStore } from '../store/playerStore';
 import { useAuthStore } from '../store/authStore';

src/components/ContextMenu.tsx

@@ -1,3 +1,5 @@
+import { getAlbum } from '../api/subsonicLibrary';
+import { getSimilarSongs2, getSimilarSongs, getTopSongs, getArtist } from '../api/subsonicArtists';
 import type { SubsonicAlbum, SubsonicArtist, SubsonicPlaylist } from '../api/subsonicTypes';
 import { songToTrack } from '../utils/songToTrack';
 import type { Track } from '../store/playerStoreTypes';
@@ -15,7 +17,7 @@ import StarRating from './StarRating';
 import { lastfmLoveTrack, lastfmUnloveTrack } from '../api/lastfm';
 import { usePlayerStore } from '../store/playerStore';
 import { useShallow } from 'zustand/react/shallow';
-import { star, unstar, getSimilarSongs2, getSimilarSongs, getTopSongs, buildDownloadUrl, getAlbum, getArtist, getPlaylists, getPlaylist, updatePlaylist, setRating } from '../api/subsonic';
+import { star, unstar, buildDownloadUrl, getPlaylists, getPlaylist, updatePlaylist, setRating } from '../api/subsonic';
 import { useNavigate } from 'react-router-dom';
 import { useAuthStore } from '../store/authStore';
 import { useDownloadModalStore } from '../store/downloadModalStore';

src/components/FullscreenPlayer.tsx

@@ -1,3 +1,4 @@
+import { getArtistInfo } from '../api/subsonicArtists';
 import { getPlaybackProgressSnapshot, subscribePlaybackProgress } from '../store/playbackProgress';
 import React, { useCallback, useEffect, useState, useRef, memo, useMemo } from 'react';
 import {
@@ -6,7 +7,7 @@ import {
   Moon, Sunrise,
 } from 'lucide-react';
 import { usePlayerStore } from '../store/playerStore';
-import { buildCoverArtUrl, coverArtCacheKey, getArtistInfo, star, unstar } from '../api/subsonic';
+import { buildCoverArtUrl, coverArtCacheKey, star, unstar } from '../api/subsonic';
 import { useCachedUrl } from './CachedImage';
 import { getCachedBlob } from '../utils/imageCache';
 import { extractCoverColors } from '../utils/dynamicColors';

src/components/Hero.tsx

@@ -1,9 +1,10 @@
+import { getRandomAlbums, getAlbum } from '../api/subsonicLibrary';
 import type { SubsonicAlbum } from '../api/subsonicTypes';
 import { songToTrack } from '../utils/songToTrack';
 import React, { useEffect, useState, useRef, useCallback, useMemo } from 'react';
 import { useNavigate } from 'react-router-dom';
 import { Play, ListPlus } from 'lucide-react';
-import { getRandomAlbums, buildCoverArtUrl, coverArtCacheKey, getAlbum } from '../api/subsonic';
+import { buildCoverArtUrl, coverArtCacheKey } from '../api/subsonic';
 import CachedImage, { useCachedUrl } from './CachedImage';
 import { usePlayerStore } from '../store/playerStore';
 import { useTranslation } from 'react-i18next';

src/components/HostApprovalQueue.tsx

@@ -1,3 +1,4 @@
+import { getSong } from '../api/subsonicLibrary';
 import type { SubsonicSong } from '../api/subsonicTypes';
 import { useEffect, useMemo, useState } from 'react';
 import { Check, X, Inbox } from 'lucide-react';
@@ -8,7 +9,7 @@ import {
   declineOrbitSuggestion,
   suggestionKey,
 } from '../utils/orbit';
-import { getSong, buildCoverArtUrl, coverArtCacheKey } from '../api/subsonic';
+import { buildCoverArtUrl, coverArtCacheKey } from '../api/subsonic';
 import CachedImage from './CachedImage';
 import { ORBIT_DEFAULT_SETTINGS } from '../api/orbit';
 

src/components/NowPlayingInfo.tsx

@@ -1,3 +1,5 @@
+import { getSong } from '../api/subsonicLibrary';
+import { getArtistInfo } from '../api/subsonicArtists';
 import type { SubsonicArtistInfo, SubsonicSong } from '../api/subsonicTypes';
 import React, { useEffect, useLayoutEffect, useMemo, useRef, useState } from 'react';
 import { useTranslation } from 'react-i18next';
@@ -5,7 +7,6 @@ import { Info } from 'lucide-react';
 import { open as shellOpen } from '@tauri-apps/plugin-shell';
 import { usePlayerStore } from '../store/playerStore';
 import { useAuthStore } from '../store/authStore';
-import { getArtistInfo, getSong } from '../api/subsonic';
 import { fetchBandsintownEvents, type BandsintownEvent } from '../api/bandsintown';
 import CachedImage from './CachedImage';
 import OverlayScrollArea from './OverlayScrollArea';

src/components/OrbitGuestQueue.tsx

@@ -1,9 +1,10 @@
+import { getSong } from '../api/subsonicLibrary';
 import type { SubsonicSong } from '../api/subsonicTypes';
 import { useEffect, useMemo, useState } from 'react';
 import { Radio, Clock } from 'lucide-react';
 import { useTranslation } from 'react-i18next';
 import { useOrbitStore } from '../store/orbitStore';
-import { getSong, buildCoverArtUrl, coverArtCacheKey } from '../api/subsonic';
+import { buildCoverArtUrl, coverArtCacheKey } from '../api/subsonic';
 import CachedImage from './CachedImage';
 import OrbitQueueHead from './OrbitQueueHead';
 

src/components/OrbitSessionBar.tsx

@@ -1,3 +1,4 @@
+import { getSong } from '../api/subsonicLibrary';
 import { songToTrack } from '../utils/songToTrack';
 import { useEffect, useRef, useState } from 'react';
 import { X, RefreshCw, Shuffle, Settings2, Share2, HelpCircle, Activity } from 'lucide-react';
@@ -5,7 +6,6 @@ import { useTranslation } from 'react-i18next';
 import { useOrbitStore } from '../store/orbitStore';
 import { useHelpModalStore } from '../store/helpModalStore';
 import { usePlayerStore } from '../store/playerStore';
-import { getSong } from '../api/subsonic';
 import {
   endOrbitSession,
   leaveOrbitSession,

src/components/QueuePanel.tsx

@@ -1,3 +1,4 @@
+import { getAlbum } from '../api/subsonicLibrary';
 import type { SubsonicPlaylist } from '../api/subsonicTypes';
 import { registerQueueListScrollTopReader, consumePendingQueueListScrollTop } from '../store/queueUndo';
 import { songToTrack } from '../utils/songToTrack';
@@ -10,7 +11,7 @@ import OrbitGuestQueue from './OrbitGuestQueue';
 import OrbitQueueHead from './OrbitQueueHead';
 import HostApprovalQueue from './HostApprovalQueue';
 import { Play, Music, Star, X, Trash2, Save, FolderOpen, Shuffle, Infinity, Waves, MicVocal, ListMusic, Check, ListPlus, MoveRight, Radio, HardDrive, ChevronDown, Info, Share2 } from 'lucide-react';
-import { buildCoverArtUrl, coverArtCacheKey, getAlbum, getPlaylists, getPlaylist, updatePlaylist, deletePlaylist } from '../api/subsonic';
+import { buildCoverArtUrl, coverArtCacheKey, getPlaylists, getPlaylist, updatePlaylist, deletePlaylist } from '../api/subsonic';
 import { usePlaylistStore } from '../store/playlistStore';
 import { useCachedUrl } from './CachedImage';
 import { useTranslation } from 'react-i18next';

src/components/Sidebar.tsx

@@ -1,3 +1,4 @@
+import { getAlbumList } from '../api/subsonicLibrary';
 import React, { useState, useRef, useLayoutEffect, useEffect, useCallback, useMemo } from 'react';
 import { createPortal } from 'react-dom';
 import { invoke } from '@tauri-apps/api/core';
@@ -17,7 +18,7 @@ import {
 import PsysonicLogo from './PsysonicLogo';
 import PSmallLogo from './PSmallLogo';
 import WhatsNewBanner from './WhatsNewBanner';
-import { getAlbumList, getPlaylists } from '../api/subsonic';
+import { getPlaylists } from '../api/subsonic';
 import { usePlaylistStore } from '../store/playlistStore';
 import { ALL_NAV_ITEMS } from '../config/navItems';
 import OverlayScrollArea from './OverlayScrollArea';

src/components/SongInfoModal.tsx

@@ -1,10 +1,10 @@
+import { getSong } from '../api/subsonicLibrary';
 import type { SubsonicSong } from '../api/subsonicTypes';
 import React, { useEffect, useState } from 'react';
 import { createPortal } from 'react-dom';
 import { X } from 'lucide-react';
 import { usePlayerStore } from '../store/playerStore';
 import { useShallow } from 'zustand/react/shallow';
-import { getSong } from '../api/subsonic';
 import { ndGetSongPath } from '../api/navidromeAdmin';
 import { useAuthStore } from '../store/authStore';
 import { useTranslation } from 'react-i18next';

src/components/StatsExportModal.tsx

@@ -1,3 +1,4 @@
+import { getAlbumList } from '../api/subsonicLibrary';
 import type { SubsonicAlbum } from '../api/subsonicTypes';
 import { useEffect, useMemo, useRef, useState } from 'react';
 import { createPortal } from 'react-dom';
@@ -5,7 +6,6 @@ import { useTranslation } from 'react-i18next';
 import { X } from 'lucide-react';
 import { save } from '@tauri-apps/plugin-dialog';
 import { writeFile } from '@tauri-apps/plugin-fs';
-import { getAlbumList } from '../api/subsonic';
 import { showToast } from '../utils/toast';
 import {
   exportAlbumCardBlob,